Half Marathon Pace Calculator

Introduction

A half marathon is 13.1 miles, and knowing your pace is key to finishing strong. The Half Marathon Pace Calculator helps you figure out how fast you need to run each mile to hit your goal finish time. Just enter your target time, and the calculator does the math for you. Whether you are training for your first half marathon or trying to beat a personal record, this tool makes planning your race simple. It takes the guesswork out of pacing so you can focus on running your best.

How to Use Our Half Marathon Pace Calculator

Enter your half marathon details below to find out your pace per mile or kilometer, your total finish time, or your required speed. The calculator helps you plan your race strategy so you can hit your goal time on race day.

Finish Time: Enter the total time you want to finish your half marathon in hours, minutes, and seconds. If you already know your goal finish time, type it here and the calculator will figure out the pace you need to hold for each mile or kilometer.

Distance Unit: Choose whether you want your pace shown in miles or kilometers. A half marathon is 13.1 miles or 21.1 kilometers. Pick the unit you are most comfortable training with.

Pace: If you already know how fast you run per mile or kilometer, enter your pace here instead. The calculator will then tell you what your total finish time will be at that pace for the full half marathon distance.

Half Marathon Pace Calculator

A half marathon is a road race that covers exactly 13.1 miles (21.1 kilometers). It is one of the most popular race distances in the world. Millions of runners sign up for half marathons each year, from beginners to experienced athletes.

What Is Pace?

Pace is the amount of time it takes you to run one mile (or one kilometer). For example, if your pace is 10 minutes per mile, it will take you about 2 hours and 11 minutes to finish a half marathon. Knowing your pace helps you plan your race so you don't start too fast and run out of energy before the finish line. You can also use our Running Pace Calculator to determine your pace for any distance, not just the half marathon.

Why Pace Matters in a Half Marathon

Running at a steady pace is one of the most important strategies in a half marathon. If you go out too fast in the first few miles, your legs can get tired quickly, and the last miles will feel much harder. This is called "hitting the wall." A good pace plan keeps your energy spread out evenly across the whole race.

Common Half Marathon Finish Times

The average half marathon finish time is roughly 2 hours for men and about 2 hours and 15 minutes for women. Beginners often finish between 2 hours 15 minutes and 2 hours 45 minutes. Elite runners can finish in under 1 hour and 10 minutes. No matter your speed, having a target pace gives you a clear goal to work toward.

How to Use Your Pace

Once you know your target pace, you can use it during training runs to get your body used to that speed. On race day, try to stick close to your planned pace from the very first mile. Many runners wear a GPS watch or use mile markers along the course to check their pace as they go. If you are also training for a full marathon, our Marathon Pace Calculator can help you plan your pacing for that longer distance. For a deeper look at your fitness level and training zones, try our VDOT Calculator to estimate your VO2max and get personalized training paces.

Tips for Picking the Right Pace

• Use your training runs as a guide. Your easy run pace should be slower than your race pace.
• Be honest about your fitness level. Setting a pace that is too fast can lead to injury or burnout. Tools like the RPE Calculator can help you gauge your effort during workouts.
• Consider the weather and course. Hot days and hilly courses will slow you down, so adjust your pace accordingly.
• Negative splitting — running the second half slightly faster than the first — is a proven race strategy used by many successful runners.
• Cross-train for variety. If you enjoy other endurance activities like swimming, our Swimming Pace Calculator can help you track your pace in the pool as well.

Frequently Asked Questions

What is a good half marathon pace for a beginner?

A good half marathon pace for a beginner is between 10:00 and 12:00 minutes per mile. This puts your finish time somewhere between 2 hours 11 minutes and 2 hours 37 minutes. Pick a pace you can hold for the full 13.1 miles without feeling like you are sprinting.

How do I calculate my half marathon pace from my finish time?

Divide your total finish time in minutes by 13.1 (the number of miles in a half marathon). For example, a 2-hour finish time is 120 minutes. Divide 120 by 13.1, and you get about 9:09 per mile. You can also just enter your finish time into the calculator above and it does the math for you.

What is the difference between pace and speed?

Pace is how many minutes it takes to run one mile or one kilometer. Speed is how many miles or kilometers you cover in one hour. They are opposites. A pace of 8:00 per mile equals a speed of 7.5 mph. The calculator can show you both.

How does the Race Equivalency tab work?

The Race Equivalency tab uses the Riegel formula to predict your half marathon time based on a shorter race result. For example, if you ran a 5K in 25 minutes, it estimates what you could run for 13.1 miles. It accounts for the fact that you slow down over longer distances.

What is the Riegel formula?

The Riegel formula is a math equation that predicts race times at different distances. The formula is T2 = T1 × (D2 / D1)^1.06, where T1 is your known time, D1 is the known distance, and D2 is the new distance. The exponent 1.06 is the standard value but can be adjusted for your fitness level.

What does the Mid-Race Projection tab do?

The Mid-Race Projection tab estimates your finish time while you are still running. Enter how far you have gone and how long it has taken. The calculator assumes you keep the same pace for the rest of the race and tells you your projected finish time.

What is a negative split in a half marathon?

A negative split means you ran the second half of the race faster than the first half. This is a smart racing strategy because it helps you save energy early and finish strong. The Split Analyzer tab can tell you if your splits show a negative, positive, or even pacing strategy.

What is a positive split?

A positive split means you ran the first half of the race faster than the second half. This usually happens when a runner starts too fast and slows down later. Most runners accidentally run positive splits, which is why having a pace plan matters.

How do I convert my pace from minutes per mile to minutes per kilometer?

Use the Pace Converter tab. Enter your pace in min/mile and click Convert. To do it by hand, divide your min/mile pace by 1.609. For example, an 8:00 per mile pace equals about 4:58 per kilometer.

What are training pace zones?

Training pace zones are different speed ranges used for different types of workouts. Easy runs are slower, tempo runs are moderate, and intervals are fast. The Training Zones tab calculates these zones based on your race time so you know exactly how fast to run during each type of training.

How accurate is the half marathon time prediction from a 5K result?

It is a solid estimate for most runners, but not perfect. The prediction assumes you train properly for the longer distance. If you only train for 5Ks and jump to a half marathon without building endurance, your actual time will likely be slower than the prediction.

What pace do I need to run a sub-2-hour half marathon?

You need to run faster than 9:09 per mile (or 5:41 per kilometer) to finish a half marathon in under 2 hours. A safe target is around 9:05 per mile to give yourself a small cushion.

What pace do I need for a 1:45 half marathon?

You need to run about 8:01 per mile or 4:58 per kilometer to finish in 1 hour and 45 minutes. This is a popular goal for intermediate runners.

Can I use this calculator for a custom distance?

Yes. In the Pace Calculator tab, select "Custom Distance" from the event dropdown. Then type in any distance and choose miles, kilometers, meters, or yards. The calculator will work the same way for any distance you enter.

What is the half marathon world record?

The men's half marathon world record is 57:31, set by Jacob Kiplimo in November 2021. The women's record is 1:02:52, set by Letesenbet Gidey in October 2021. You can see these and more details in the Reference Data tab.

How do I use the Split Analyzer?

Set the split distance (like 1 mile), enter the number of splits, and click Generate Fields. Then type in the time for each split. Click Analyze Splits and the tool will show your pace for each split, your average pace, your fastest and slowest splits, and whether you ran negative or positive splits.

Should I run the same pace for every mile?

Running an even pace is a great strategy for most runners. It helps you use your energy wisely. Some experienced runners prefer a slight negative split, starting a little slower and speeding up in the second half. Avoid starting too fast — that is the most common pacing mistake.

How does elevation affect my half marathon pace?

Hills slow you down. A hilly course can add 1 to 3 minutes to your finish time compared to a flat course. If your race has big hills, plan for a slightly slower pace on the uphills and a faster pace on the downhills. Adjust your goal time to account for the course profile.