Enter your distance and time into the pace calculator above to get your pace per mile, pace per km, and projected finish times for popular race distances. Whether you're training for a 5K or chasing a marathon PR, this tool gives you the numbers you need to plan your next run.
Running Pace Calculator
A running pace calculator takes two inputs (distance and time) and returns a third value: your pace. You can also work it in reverse. Enter a target pace and distance to find your estimated finish time, or enter a pace and time to find the distance covered.
This calculator works for any distance, from a quick neighborhood loop to an ultramarathon. It handles miles, kilometers, and meters, so you can match whatever units your watch or treadmill displays.
What can you calculate with a pace calculator?
- Pace per mile or km from a known distance and time
- Finish time from a target pace and race distance
- Distance covered from a pace and duration
- Split times for specific intervals within a longer run
The math behind it is simple: pace equals time divided by distance. The calculator just removes the mental arithmetic so you can focus on planning.
How to Calculate Your Running Pace
To calculate your running pace, you need two pieces of information: how far you ran and how long it took. Plug those into the calculator, and it returns your average pace.
For example, if you ran 3.1 miles in 27 minutes, your pace is roughly 8:42 per mile. If you ran 5 kilometers in 25 minutes, your pace is 5:00 per km.
How does a running pace calculator work?
It divides your total time by the distance. That gives you the average number of minutes (and seconds) it took to cover each mile or kilometer. The calculator also converts between units, so you can see both your pace per mile and pace per km from a single entry.
Pace per mile and per km
Pace per mile and pace per km are simply two ways of expressing the same speed in different units. Most runners in the United States think in miles. Runners in most other countries think in kilometers.
A quick reference:
- 8:00 per mile is roughly 4:58 per km
- 10:00 per mile is roughly 6:13 per km
- 12:00 per mile is roughly 7:27 per km
You can also convert pace to speed in mph. An 8:00 per mile pace equals 7.5 mph. This is useful if you're setting a treadmill speed and want to match your outdoor pace.
The calculator handles all these conversions automatically. Enter your numbers in whichever unit you prefer.
Race distance, split, and target pace
Common race distances have standard values built into the calculator:
- 5K: 3.1 miles (5 kilometers)
- 10K: 6.2 miles (10 kilometers)
- Half marathon: 13.1 miles (21.1 km)
- Marathon: 26.2 miles (42.2 km)
A split is your time for a specific segment within the race, usually each mile or each kilometer. Splits help you understand whether you started too fast, held steady, or sped up at the end.
A target pace is the pace you plan to maintain throughout a race or workout. If your goal time for a half marathon is 2:00:00, your target pace is about 9:09 per mile. The calculator figures this out so you don't have to do long division mid-run.
Race Time Calculator and Finish Time Predictor
Use the calculator to estimate your finish time for any race distance. Enter your target pace and the race distance, and it returns your projected finish time.
This is an estimate, not a guarantee. Real race times depend on weather, terrain, nutrition, fatigue, and how you feel that day. But a finish time estimate gives you a realistic goal to build your training plan around.
Marathon and half marathon race time
What pace do I need to maintain to run a four-hour marathon?
A 4:00:00 marathon requires a pace of about 9:09 per mile (5:41 per km) sustained over 26.2 miles. That's a steady, consistent effort for roughly 4 hours.
Here are a few common marathon and half marathon goal times with the pace required:
| Goal | Race | Pace per mile | Pace per km |
|---|---|---|---|
| 1:45:00 | Half marathon | 8:01 | 4:59 |
| 2:00:00 | Half marathon | 9:09 | 5:41 |
| 3:30:00 | Marathon | 8:01 | 4:59 |
| 4:00:00 | Marathon | 9:09 | 5:41 |
| 4:30:00 | Marathon | 10:18 | 6:24 |
Marathon training typically involves months of preparation. Your target pace should be based on recent training runs, not wishful thinking. If your longest runs have been at 9:30 per mile, a 9:09 race pace is aggressive but possible. A 7:30 race pace probably is not.
5K and 10K finish time
What is a good time to run a 5K race?
That depends entirely on your experience and fitness level. For a first race, finishing is the goal. For context, the average 5K finish time in the U.S. falls between 25 and 35 minutes.
Some benchmarks:
- Sub-20:00 5K: 6:26 per mile pace. Competitive for most local races.
- 25:00 5K: 8:03 per mile. A solid, achievable target for many runners.
- 30:00 5K: 9:40 per mile. A comfortable pace for newer runners.
- 35:00 5K: 11:17 per mile. A walk/run pace that gets you across the finish line.
For a 10K, double the distance but expect a slightly slower pace than your 5K. Most runners slow by 15 to 30 seconds per mile when they double the distance. So a 25:00 5K runner might finish a 10K around 53 to 55 minutes.
The calculator estimates these projections quickly. Enter your best recent time at one distance, and use it to set a realistic goal at another.
Pace Calculator for Every Runner
This pace calculator isn't only for competitive racers. It works for anyone who moves on foot and wants to understand their speed: beginner joggers, marathon veterans, walkers, and everyone in between.
What kind of runner are you? It doesn't matter. The math is the same. The calculator is a tool that serves your goals, whatever they are.
Calculate pace for training with a coach
A running coach will often prescribe workouts at specific paces. You might see instructions like "run 4 x 800 meters at 10K pace" or "easy run at marathon pace plus 60 seconds."
The pace calculator helps you translate those instructions into actual numbers. If your 10K pace is 8:00 per mile, an 800 meter repeat at that pace should take about 3:58. Your easy run pace would be around 9:00 per mile.
Coaches build training plans around pace zones. Knowing your numbers makes every workout more accurate and productive. You train at the right intensity instead of guessing.
Walking pace vs running pace
Walking pace matters too. Many people use a pace calculator to plan walking workouts, hiking trips, or walk/run intervals.
A typical walking pace is 15:00 to 20:00 per mile (9:19 to 12:26 per km). A brisk walk is closer to 13:00 to 15:00 per mile. Once you drop below about 12:00 per mile, most people transition from a walk to a jog.
If you're training for a first race using a run/walk strategy, the calculator helps you estimate your overall finish time by blending your running pace and walking pace based on your planned intervals.
Understanding Your Pace: Lactate Threshold and Heart Rate
Pace isn't just a number on a stopwatch. It connects directly to how your body is working. Two important concepts help explain why some paces feel easy and others feel impossible.
Lactate threshold is the exercise intensity where lactic acid starts building up in your muscles faster than your body can clear it. Below this threshold, you can sustain the effort for a long time. Above it, fatigue accumulates quickly. For most runners, lactate threshold pace falls somewhere around their 10K to half marathon race pace.
Heart rate reflects how hard your cardiovascular system is working. Many runners use a heart rate monitor to stay in specific training heart rate zones during workouts. Your resting heart rate and target heart rate zones give you another lens for understanding effort beyond pace alone.
Aerobic and anaerobic exercise pace
- Aerobic pace: You're using oxygen efficiently. Conversation is possible. This covers easy runs, long runs, and recovery jogs. Most of your training should happen here.
- Anaerobic pace: You've crossed the lactate threshold. Breathing is heavy. You can sustain this for minutes, not hours. This is your interval and tempo workout zone.
Understanding where these zones fall in your pace range helps you train smarter. Easy days should be truly easy. Hard days should be intentionally hard. The pace calculator helps you assign concrete numbers to each zone.
How pace relates to endurance and calories
Slower paces allow you to run longer. Faster paces burn through your energy reserves more quickly. This relationship between pace, duration, and endurance is the foundation of distance running.
Calorie burn during running depends mainly on your body weight and distance, not pace. Running a mile burns roughly the same calories whether you run it in 7 minutes or 12 minutes. But pace determines how long you're exercising, which affects total calorie expenditure in a given session.
A 150-pound runner burns approximately 100 calories per mile. Over a 10K (6.2 miles), that's roughly 620 calories. The pace calculator doesn't estimate calories directly, but knowing your pace and distance gives you what you need for a quick estimate.
Race Pace Predictor: From 5K to Marathon
A race pace predictor uses a recent race result to estimate what you could run at a different distance. It applies a formula that accounts for the natural slowdown that happens as distance increases.
This is one of the most useful features of the calculator. If you just ran a 5K and want to know what marathon time is realistic, the predictor gives you a data-driven starting point.
Using a race predictor to set your target
Here's how to use it:
- Enter a recent race time and distance. Choose a result from the last 2 to 3 months for the most accurate prediction.
- Select the race distance you're targeting.
- The calculator estimates your finish time and required pace.
The prediction assumes consistent training. If your 5K was a one-off effort and you haven't been running regularly, the marathon estimate will be optimistic. Treat the result as a guide, not a promise.
What's a recent race time? It should be from a genuine race effort, or a time trial where you pushed yourself. An easy training run pace will produce misleading predictions.
How distance affects your race pace
Your pace per mile gets slower as the race distance gets longer. This is normal and expected. Here's a rough illustration for a runner with a 22:00 5K:
| Distance | Estimated time | Pace per mile |
|---|---|---|
| 5K | 22:00 | 7:05 |
| 10K | 45:40 | 7:21 |
| Half marathon | 1:41:30 | 7:46 |
| Marathon | 3:31:00 | 8:03 |
The slowdown happens because of fatigue, glycogen depletion, and the cumulative stress of impact over longer distances. Elite runners experience less slowdown than recreational runners because of superior fitness, nutrition, and race-day strategy.
The predictor factors in this natural slowdown. It won't tell you that your 5K pace can magically hold for 26.2 miles.
Calculate Your Running Pace With Confidence
The pace calculator above gives you the numbers for any distance, pace, or finish time combination. Use it to plan your next race, structure a training plan, or simply understand how fast you're moving.
A few tips to get the most from it:
- Be honest with your inputs. Use recent, genuine efforts for the most accurate results.
- Check both miles and kilometers. Knowing your pace in both units helps when using different apps, watches, or treadmills.
- Revisit as you improve. Your pace changes with training. Update your targets as you get faster.
- Remember it's an estimate. Race day brings variables no calculator can predict. Weather, hills, nutrition, and nerves all play a role.
Enter your distance and time, and the calculator does the rest. That's it. No login, no cost, just the numbers you need to run your best.