A Travel Price Comparison for Families, Couples, and Backpackers Christchurch vs. Utrecht for Families, Attractions, Food, and Nightlife

Should you visit Christchurch or Utrecht?

Which is cheaper to visit? Which is more expensive for vacation?

Should I visit Christchurch or Utrecht? This is a common question asked by many travelers. By figuring out which city has activities that align with your interests along with knowing which is more affordable, you'll understand where you can get more bang for your buck. So, let's dive into the details and the data, which all comes from actual travelers.

Christchurch

Christchurch is a cultural, outdoorsy, and adventure-filled city. Christchurch is a gorgeous place to visit. It's also known for nightlife, food, and beaches. See Christchurch travel costs.

Utrecht

The beauty of Utrecht is also one of the main reasons why visitors come. With a quaint atmosphere, it also offers a unique feeling. And you can't forget about the shopping, museums, and nightlife. See Utrecht travel costs.

Christchurch and Utrecht: Pros and Cons

Pros
  • Popular museums and historical sights
  • Active nightlife
  • Popular beach
  • Good for hiking
  • Family-friendly
  • Good for couples and romance
  • Good for backpackers and budget travelers
Pros
  • Popular museums and historical sights
  • Active nightlife
  • Scenic old town
  • Good for couples and romance
  • Good for backpackers and budget travelers
  • Impressive beauty
  • Quaint atmosphere
Things to Consider
  • Less family-friendly


Is there more to do in Christchurch or Utrecht?

Tourists will generally find more to do in Christchurch than Utrecht. It is bigger and it has more sights, attractions, and activities for travelers. Christchurch is very popular for its museums and attractions, food, beaches, and hiking, while Utrecht attracts visitors for its historical sights, impressive beauty, and quaint atmosphere. Utrecht is more touristy than Christchurch and is known for its beautiful canals, huge number of bikes, and charming old town. Christchurch is famous for its outdoor beauty and relaxing, scenic atmosphere. It is also well known for the Christchurch Botanic Gardens.

How is Christchurch different from Utrecht?

Which is Better for a Holiday?

Let's take a look at the differences and similarities between Utrecht and Christchurch. Then, you can decide for yourself which place is better for your next trip.

Are the Museums and Historical Sights Better in Christchurch or Utrecht?

Christchurch
Utrecht

Christchurch is a well-known place for its sights and museums. Also, Utrecht is not as famous, but is still a good to visit for its museums and history.

Christchurch offers many unique museums, sights, and landmarks that will make for a memorable trip. The city is filled with street art and local galleries. There's also Canterbury Museum, the International Antarctic Centre, the Arts Centre, and the Riccarton House & Bush.

Utrecht offers a variety of museums and landmarks to choose from. The Dom Tower and St. Martin's Cathedral is a highlight of the city, but you'll also find smaller, more local museums and several beautiful churches. If you're up for heading out of town, you can visit De Haar Castle, which is most accessible if you have a private vehicle.


Is the Food Better in Christchurch or Utrecht? Which Destination has the Best Restaurants?

Christchurch
Utrecht

Christchurch is a well-known place for its local cuisine and restaurants. Also, Utrecht is not as famous, but is still a good to visit for its restaurants.

With its innovative style combined with traditional elements, Christchurch makes for a great culinary experience. There's a mix of cozy cafes and casual eateries around town. You'll also find some fine dining restaurants as well as international flavors.

Utrecht has a delicious restaurant scene that relies on local flavors. There are a number of interesting international restaurants around town including Greek, Italian, and Spanish tapas. It's particularly fun to dine canal-side and sip wine as the boats pass by.

Is Christchurch or Utrecht Better for Nightlife?

Christchurch
Utrecht

Party-goers will find similar levels of energy in Christchurch and Utrecht.

Christchurch is a popular destination for visitors looking to party into the night. The city has its share of dance clubs, live music venues, and laid back bars. You'll find a number of popular hangout spots around Oxford Terrace or on the historic New Regent Street.

Many people head to Utrecht for the nightlife scene. The student population keeps the nightlife scene fun and lively. There are plenty of bars in the old town and you'll find tourists and locals hanging out at the same spots.

Is Christchurch or Utrecht Better for Beaches?

Christchurch
Utrecht

Christchurch is a well-known place for its beaches. However, Utrecht is not a beach destination.

Christchurch is considered a top beach destination. There are sandy beaches in the area with water sports and various amenities. The summer months are the most popular time for hanging out at the beach, and you'll find local families playing in the sun or enjoying a picnic.

Utrecht is not a beach destination.


Is Christchurch or Utrecht Better for its Old Town?

Christchurch
Utrecht

Utrecht is terrific for its old town. However, Christchurch does not have a historic old town.

Utrecht has a unique history which comes to life in its historic area. The old town is large, charming, and filled with locals. There are canals that that see a frequent stream of boats and kayakers. There are also historic buildings and cobblestone streets. The city is unique because many cafes offer seating directly next to the canals.

Christchurch does not have a historic old town.

Is Christchurch or Utrecht Better for Hiking?

Christchurch
Utrecht

Christchurch is a well-known place for the nearby hiking options. However, Utrecht is not a hiking destination.

Christchurch is a popular spot for hiking. There are many beautiful hikes in the area that take you along the coastline or past local historic sights. The landscape is diverse and you'll find many amazing parks in the area. Hooker Valley Track is one of the best hiking routes nearby.

Utrecht is not a hiking destination.

Is the Shopping Better in Christchurch or Utrecht?

Christchurch
Utrecht

Shopping is a popular activity in both Utrecht and Christchurch.

Christchurch is a popular shopping destination with plenty of stores. There's a mix of boutique shops, outlet malls, and open air markets. Some of the best shopping places include the Tannery and the Colombo.

Many visitors explore the shopping areas in Utrecht. You'll find both local shops and European chains throughout the old town. There's also a large mall right next to the main tourist area.


Is Christchurch or Utrecht More Beautiful?

Christchurch
Utrecht

Utrecht is well known for its scenery and beauty. Also, Christchurch is still popular, but not quite as popular for its scenery and beauty.

The beauty of Utrecht is also one of the main reasons why visitors come. The town is filled with beautiful canals and cozy cafes. The lights in the evening are nice and the buildings have a historic charm.

Christchurch offers plenty of beauty for visitors. With its many beautiful parks, gardens, and outdoor spaces, this is a very scenic city.

Is Christchurch or Utrecht Better for Families?

Christchurch
Utrecht

Christchurch is a world-class destination for its family-friendly activities. Also, Utrecht is not as famous, but is still a good to visit for its kid-friendly activities.

As it has a large number of activities for kids, Christchurch is a very family-friendly destination. The International Antarctic Centre is a thrilling and fun experience. There's also the Orana Wildlife Park or Willowbank Wildlife Reserve. For adrenaline junkies there are the ropes courses at the Adrenalin Forest. There are also many indoor playgrounds and rock climbing facilities.

Utrecht is a family-friendly city. There are a few museums around town that are fun for kids. Make sure you check out the Miffy Museum, which is great for younger kids. The Museum Speelklok is fun for kids and adults alike. Families will also enjoy renting bikes for the day or taking a canal boat tour. Also make sure you try some local pancakes.

Is Christchurch or Utrecht Better for Couples?

Christchurch
Utrecht

With fun activities for couples, both Christchurch and Utrecht make for a high quality place to visit.

Couples visit Christchurch frequently as it offers plenty of romantic activities. Punting on the Avon River is one of the most romantic activities in the city. There are also botanical gardens, parks, and natural areas that are fun to explore. Nearby, you can do a wine tour, or there are cocktail bars and charming restaurants in town. The city also has a nice theater and many other date night activities.

Utrecht is a great city if you're traveling as a couple. The charming old town and cozy cafes make for a wonderful date day. You can take a canal boat tour, sip coffee at a cafe by a canal, or explore the city as it lights up at night.


Is Christchurch or Utrecht Better for Backpackers and Budget Travelers?

Christchurch
Utrecht

Christchurch and Utrecht are high quality places to visit for backpackers and budget travelers.

Christchurch is a great city to visit for backpackers. There's no shortage of hostels around town, and many backpackers pass through Christchurch on their epic New Zealand adventure.

Plenty of budget travelers and backpackers visit Utrecht. It's a university city with a young population and plenty to do in the evening. There are also a decent number of hostels to choose from and a lively atmosphere with fun activities and festivals.

Is Christchurch or Utrecht Better for Students?

Christchurch
Utrecht

Christchurch and Utrecht are high quality places to visit for students.

Christchurch is a very popular city for students and younger travelers. It's the largest city on the South Island and there are plenty of activities and nearby trips that you can enjoy.

Utrecht is very popular with students. This is a great university city. The population is young, but housing can be challenging to find and very expensive.

Is Christchurch or Utrecht Better for Public Transit? Which Is Easier to Get Around Without a Car?

Christchurch
Utrecht

Utrecht is well known for its public transit. Also, Christchurch is still popular, but not quite as popular for times when you don't have a car.

Utrecht has some very good public transit options. There are buses around town and two tram lines that travel to the suburbs.

While Christchurch offers some public transit options, it might not be your first choice. While it's not a diverse transit system, the buses are well connected and offer the cheapest way to get around town.


Is Christchurch or Utrecht a more walkable city?

Christchurch
Utrecht

Utrecht is terrific for its high level of walkability. Also, Christchurch is still popular, but not quite as popular for its ease of walking around.

Getting around Utrecht on foot is easy. The old town is easy to explore on foot, but don't walk in a bike lane or you'll likely receive a firm scolding from a local. Utrecht is regularly ranked as one of the world's most bike-friendly cities.

Christchurch is a very walkable destination. The city center is relatively flat and easy to explore on foot.

For even more information, also check out Is Christchurch Worth Visiting? and Is Utrecht Worth Visiting?.

Should I spend more time in Utrecht or Christchurch?

How long in Christchurch or Utrecht?

Visitors can find plenty of fun things to do in both Christchurch and Utrecht. With generally more activities and things to do, visitors tend to spend more time in Christchurch than in Utrecht. Usually, 2-4 days is a good amount of time for Christchurch, and 1-3 days is enough time in Utrecht.

Families should spend more time in Christchurch than Utrecht. Because of the many family-friendly attractions and fun things to do for kids in Christchurch, it's a great place to visit with the whole family.

Couples should spend more time in Christchurch than Utrecht. You'll find plenty of romantic sights and fun activities in Christchurch that are great for a weekend getaway or a longer couple's trip.

Backpackers and budget travelers should spend more time in Christchurch than Utrecht if your budget allows for it. With a larger number of budget-friendly sights, good nightlife, and active things to do, anyone traveling on a budget would have a good time in Christchurch.


  • How many days in Christchurch or Utrecht? Ideal Length of Stay
    Christchurch 2-4 
    Utrecht 1-3

One day in Christchurch or Utrecht?

In Christchurch, you'll find nightlife and food. You'll find plenty of activities on the beach. This city offers something for everyone. One day is usually not enough time for a trip here as there is plenty to do.

In Utrecht, many people enjoy the food and shopping that this vibrant offers. Most visitors spend time around the old town while in the area. The length of your ideal trip is an individual decision. In one day, you should have a good grasp of this .

A weekend in Christchurch or Utrecht?

In Christchurch, you'll find food and shopping. The length of your trip often depends on your style of travel. A weekend here is typical. Hiking can easily take up a good amount of your time here, too. A weekend is a great amount of time to relax and see the many things that Christchurch has to offer.

Utrecht is a fun place to experience. Visiting the old town is also a must. If you have a weekend, this is a great place to go. It will give you the chance to have new experiences. So, a weekend is just the right amount of time to spend here.


Five days in Christchurch or Utrecht?

Christchurch is a great place to explore. Many visitors spend time at the beach while visiting the area. Five days is more than enough time to enjoy everything. Take some day trips to nearby places to fill the extra days. Anyone can find something fun to do here.

You'll find museums and nightlife around the historic destination of Utrecht. The old town is one of the main draws for visitors. Take your pick from the many activities offered here. Five days is more than enough time to enjoy everything. Take some day trips to nearby places to fill the extra days.

A week in Christchurch or Utrecht?

It's hard to know how much time to spend in Christchurch. Many people enjoy the museums and nightlife when visiting Christchurch. People usually spend lots of time at the beach. One week may feel like too much time unless you plan to do a lot of relaxing.

Utrecht is a popular place to visit. Exploring the old town is a popular activity. One week may feel like too much time unless you plan to do a lot of relaxing. The entire region has so many activities, and you'll want time to do everything.


For some great organized tour ideas, see The Best G Adventures Tours to New Zealand, The Best One-Week (7-Day) Tours from Auckland, The Best Family-Friendly Tours to Netherlands, and The Best One Week (7-Day) Tours in Netherlands.


Which place is cheaper, Utrecht or Christchurch?

These are the overall average travel costs for the two destinations. These travel costs come from the actual spending of real travelers.

The average daily cost (per person) in Christchurch is $117, while the average daily cost in Utrecht is $271. These costs include accommodation (assuming double occupancy, so the traveler is sharing the room), food, transportation, and entertainment. While every person is different, these costs are an average of past travelers in each destination. What follows is a categorical breakdown of travel costs for Christchurch and Utrecht in more detail.



Accommodation
  • Accommodation Hotel or hostel for one person
    Christchurch $49
    Utrecht $125
  • Accommodation Typical double-occupancy room
    Christchurch $98
    Utrecht $250
Compare Hotels in Christchurch and Utrecht

Looking for a hotel in Christchurch or Utrecht? Prices vary by location, date, season, and the level of luxury. See below for options and compare which is best for your budget and travel style.

Hotels in Christchurch


Hotels in Utrecht


Kayak helps you find the best prices for hotels, flights, and rental cars for destinations around the world. Compare prices for multiple destinations when planning your next trip.


Our Analysis
We've analyzed the average and typical hotel prices based on guest reviews, star ratings, and hotel amenities here: Christchurch Hotel Prices and Utrecht Hotel Prices.

Local Transportation
  • Local Transportation Taxis, local buses, subway, etc.
    Christchurch $14
    Utrecht $27

Hired Cars and Shuttles in Christchurch

Some specific examples of transportation prices in Christchurch:

  • CHC Airport to Downtown|Hotel Private Transfer: $26
  • Christchurch Airport to City SUV Transfer: $57
  • Private Transfer from Christchurch City to Lyttelton Cruise Port: $87
  • Private Transfer from Lyttelton Cruise Port to Christchurch City: $87
  • Departure Transfer: Christchurch to Airport CHC by Business Car: $95
  • Christchurch Airport Transfers : Airport CHC to Christchurch in Luxury Car: $130
  • Christchurch Airport Transfers : Christchurch to Airport CHC in Luxury Car: $130
  • Christchurch Airport (CHC): Transfer to Christchurch hotels: $164
  • Private Transfer from Christchurch City to Akaroa Cruise Port: $189

Hired Cars and Shuttles in Utrecht

Some specific examples of transportation prices in Utrecht:

  • Private transfer from Utrecht to AMS Schiphol Airport: $131
  • Private taxi transfer from Utrecht to Amsterdam: $111
  • Train Transfer Utrecht from/to Rotterdam: $17

Is it cheaper to fly into Christchurch or Utrecht?

Prices for flights to both Utrecht and Christchurch change regularly based on dates and travel demand. We suggest you find the best prices for your next trip on Kayak, because you can compare the cost of flights across multiple airlines for your prefered dates.





Food
  • Food Meals for one day
    Christchurch $53
    Utrecht $117

Food Tours and Cooking Classes in Utrecht

Also, here are some specific examples of food and dining related activities in Utrecht.

  • Utrecht Food Tour on a Bicycle with local guide: $81
  • Utrecht Food Tour with local guide: $83

Entertainment
  • Entertainment Entrance tickets, shows, etc.
    Christchurch $17
    Utrecht $51

Tours and Activities in Christchurch

Here are a few actual costs in Christchurch for available activities, ticket prices, and tours:

  • Willowbank Wildlife Reserve Day Entry Ticket: $20
  • Scenic Chairlift Ride at Christchurch Adventure Park: $20
  • Hop-On Hop-Off Tour by Vintage Tram: $23
  • Christchurch Gondola Ride Ticket: $25
  • Christchurch Mystery Puzzle Tour “Shadow of the Prism”: $29
  • International Antarctic Centre General Admission Ticket: $44
  • Christchurch Tram City Tour & Punting Combo: $45
  • Christchurch Gondola and Tram City Tour Combo: $45
  • Gondola Ticket and Punt Ride on the Avon River: $46
  • Waka Paddling Experience on the Avon River: $57
  • Uniquely Kiwi Landsailing Adventure: $59
  • Tram, Punt and Gondola Ride Combo Ticket: $66

Tours and Activities in Utrecht

Some specific costs of activities, tours, and entrance tickets for Utrecht are as follows:

  • Utrecht 2-Hour Walking Tour | Discover The City With A Local: $3.58
  • A Self-Guided Audio Tour of Utrecht's Charming City Centre: $5.99
  • Discover Utrecht's Highlights: Your Self-Guided GPS Tour: $8.29
  • Castles, Canals and Good Folk: A Self-Guided Audio Tour of Utrecht: $8.99
  • Utrecht Scavenger Hunt and Highlights Self-Guided Tour: $9.53
  • Utrecht Historic City: a Self-Guided Augmented Reality Tour: $12
  • Pub Trail an adventure full of surprises: $13
  • Pub Trail Utrecht An Adventure Full of Surprises: $13
  • Cultural and Historical Audio Guided Walking Tour of Utrecht: $16
  • Utrecht Guided Highlights Walking Tour: $19
  • Utrecht Walking Tour with a local comedian as guide: $23
  • Escape Tours Utrecht; find the secret exit and win! : $24

Alcohol
  • Alcohol Drinks for one day
    Christchurch $11
    Utrecht $28

Sample the Local Flavors in Christchurch

Also in Christchurch, these are the prices for nightlife and alcohol related activities from various tour providers:

  • Waipara Wine Tour from Christchurch - including Lunch & Tastings: $108
  • Lyttelton Shore Excursion - Waipara Wine Tour With Lunch: $114
  • From Guided Local Wine Tours in Waipara: $116
  • Lyttelton Shore Excursion - City Highlights & Waipara Wine Tour : $135


When we compare the travel costs of actual travelers between Christchurch and Utrecht, we can see that Utrecht is more expensive. And not only is Christchurch much less expensive, but it is actually a significantly cheaper destination. Since Christchurch is in Pacific and Utrecht is in Europe, this is one of the main reasons why the costs are so different, as different regions of the world tend to have overall different travel costs. So, traveling to Christchurch would let you spend less money overall. Or, you could decide to spend more money in Christchurch and be able to afford a more luxurious travel style by staying in nicer hotels, eating at more expensive restaurants, taking tours, and experiencing more activities. The same level of travel in Utrecht would naturally cost you much more money, so you would probably want to keep your budget a little tighter in Utrecht than you might in Christchurch.

If you're trying to decide if either of these two destinations are within your price range, also see Is Christchurch Expensive? and Is Utrecht Expensive?.


Which is Bigger, Christchurch or Utrecht?

Christchurch has a larger population, and is about 25% larger than the population of Utrecht. When comparing the sizes of Christchurch and Utrecht, keep in mind that a larger population does not always imply the destination has more attractions or better activities. So, always research the type of place that you want to visit along with the activities and attractions that interest you.


When is the best time to visit Christchurch or Utrecht?

Even though both destinations experience a temperate climate with four distinct seasons, they experience these seasons at different times of the year. Christchurch is in the southern hemisphere and summer is in January and winter is in July, but Utrecht has summer in [NORTHERNSUMMERMONTH] and winter in [NORTHERNWINTERMONTH].

Should I visit Christchurch or Utrecht in the Summer?

The summer attracts plenty of travelers to both Christchurch and Utrecht. The summer months attract visitors to Christchurch because of the beaches, the hiking, and the family-friendly experiences. Furthermore, the family-friendly experiences are the main draw to Utrecht this time of year.

In January, Christchurch is generally around the same temperature as Utrechtin July. Daily temperatures in Christchurch average around 18°C (64°F), and Utrecht fluctuates around 17°C (62°F).

In Christchurch, it's very sunny this time of the year. Christchurch usually receives more sunshine than Utrecht during summer. Christchurch gets 224 hours of sunny skies, while Utrecht receives 194 hours of full sun in the summer.

In January, Christchurch usually receives less rain than Utrechtin July. Christchurch gets 46 mm (1.8 in) of rain, while Utrecht receives 75 mm (3 in) of rain each month for the summer.


  • Summer Average Temperatures January and July
    Christchurch 18°C (64°F) 
    Utrecht 17°C (62°F)

Should I visit Christchurch or Utrecht in the Autumn?

The autumn brings many poeple to Christchurch as well as Utrecht. The hiking trails, the shopping scene, and the natural beauty of the area are the main draw to Christchurch this time of year. Additionally, many travelers come to Utrecht for the shopping scene and the natural beauty of the area.

Christchurch is a little warmer than Utrecht in the autumn. The daily temperature in Christchurch averages around 12°C (54°F) in April, and Utrecht fluctuates around 11°C (51°F)in October.

In the autumn, Christchurch often gets more sunshine than Utrechtin October. Christchurch gets 161 hours of sunny skies this time of year, while Utrecht receives 100 hours of full sun.

Christchurch usually gets less rain in April than Utrechtin October. Christchurch gets 53 mm (2.1 in) of rain, while Utrecht receives 72 mm (2.8 in) of rain this time of the year.


  • Autumn Average Temperatures April and October
    Christchurch 12°C (54°F) 
    Utrecht 11°C (51°F)

Should I visit Christchurch or Utrecht in the Winter?

Both Utrecht and Christchurch are popular destinations to visit in the winter with plenty of activities. Many travelers come to Christchurch for the museums, the shopping scene, and the cuisine. Also, many visitors come to Utrecht in the winter for the museums, the shopping scene, and the cuisine.

Utrecht can get quite cold in the winter. In the winter, Christchurch is much warmer than Utrecht. Typically, the winter temperatures in Christchurch in July average around 6°C (43°F), and Utrecht averages at about 2°C (36°F)in January.

Christchurch usually receives more sunshine than Utrecht during winter. Christchurch gets 122 hours of sunny skies, while Utrecht receives 38 hours of full sun in the winter.

In July, Christchurch usually receives around the same amount of rain as Utrechtin January. Christchurch gets 68 mm (2.7 in) of rain, while Utrecht receives 66 mm (2.6 in) of rain each month for the winter.


  • Winter Average Temperatures July and January
    Christchurch 6°C (43°F) 
    Utrecht 2°C (36°F)

Should I visit Christchurch or Utrecht in the Spring?

Both Utrecht and Christchurch during the spring are popular places to visit. Many visitors come to Christchurch in the spring for the beaches and the natural beauty. Also, most visitors come to Utrecht for the natural beauty during these months.

In October, Christchurch is generally much warmer than Utrechtin April. Daily temperatures in Christchurch average around 12°C (54°F), and Utrecht fluctuates around 8°C (46°F).

It's quite sunny in Christchurch. In the spring, Christchurch often gets more sunshine than Utrechtin April. Christchurch gets 204 hours of sunny skies this time of year, while Utrecht receives 156 hours of full sun.

Christchurch usually gets less rain in October than Utrechtin April. Christchurch gets 45 mm (1.8 in) of rain, while Utrecht receives 52 mm (2 in) of rain this time of the year.


  • Spring Average Temperatures October and April
    Christchurch 12°C (54°F) 
    Utrecht 8°C (46°F)

Typical Weather for Utrecht and Christchurch

Christchurch Utrecht
Temp (°C) Rain (mm) Temp (°C) Rain (mm)
Jan 18°C (64°F) 46 mm (1.8 in) 2°C (36°F) 66 mm (2.6 in)
Feb 17°C (63°F) 42 mm (1.7 in) 3°C (37°F) 49 mm (1.9 in)
Mar 16°C (60°F) 57 mm (2.2 in) 5°C (41°F) 63 mm (2.5 in)
Apr 12°C (54°F) 53 mm (2.1 in) 8°C (46°F) 52 mm (2 in)
May 9°C (49°F) 58 mm (2.3 in) 12°C (54°F) 61 mm (2.4 in)
Jun 6°C (44°F) 51 mm (2 in) 15°C (59°F) 68 mm (2.7 in)
Jul 6°C (43°F) 68 mm (2.7 in) 17°C (62°F) 75 mm (3 in)
Aug 7°C (45°F) 60 mm (2.4 in) 17°C (62°F) 71 mm (2.8 in)
Sep 10°C (49°F) 41 mm (1.6 in) 14°C (57°F) 67 mm (2.6 in)
Oct 12°C (54°F) 45 mm (1.8 in) 11°C (51°F) 72 mm (2.8 in)
Nov 14°C (58°F) 50 mm (2 in) 6°C (43°F) 81 mm (3.2 in)
Dec 16°C (61°F) 45 mm (1.8 in) 3°C (38°F) 80 mm (3.1 in)