Calculate Your Running Pace
Running Pace Calculator is a free tool that calculates your pace (minutes per kilometer or mile), converts between pace and speed, and predicts finish times for standard race distances. Enter a distance and time to find your pace, a distance and pace to predict finish time, or a time and pace to find how far you ran.
It is useful when planning training runs, setting race goals, or comparing effort across different distances. It does not account for elevation, weather, fatigue, or other variables that affect real-world performance.
Quick Start — 3 Steps
- Choose a mode — "Find Pace" (distance + time), "Find Time" (distance + pace), or "Find Distance" (time + pace).
- Enter your values — distance in km, miles, or meters; time as hh:mm:ss; pace as mm:ss per unit.
- Read your results — pace in both min/km and min/mile, speed in km/h, and predicted splits for 1K through marathon.
Examples
Example 1 — 5K run in 27:30
Input: 5 km, 27 minutes 30 seconds
- Pace: 5:30 min/km (8:51 min/mile)
- Speed: 10.9 km/h (6.8 mph)
- At this pace, a 10K would take 55:00 and a half marathon 1:56:13
Example 2 — Marathon target: sub-4 hours
Input: 42.195 km, target pace 5:35 min/km
- Predicted finish time: 3:55:47
- Speed: 10.7 km/h (6.7 mph)
- Provides a 4-minute buffer below the 4:00:00 mark
Example 3 — How far in 30 minutes at 6:00 min/km?
Input: 30 minutes, 6:00 min/km pace
- Distance: 5.00 km (3.11 miles)
- Useful for planning time-based training runs
Example 4 — Edge case: walking pace
Input: 3 km in 36 minutes
- Pace: 12:00 min/km (19:19 min/mile)
- Speed: 5.0 km/h (3.1 mph) — a typical brisk walking pace
The Pace Formula
Running pace is the time it takes to cover one unit of distance. The three basic formulas are:
Pace = Time ÷ Distance
Time = Pace × Distance
Distance = Time ÷ Pace
For example, if you ran 10 km in 55 minutes:
- Pace = 55 min ÷ 10 km = 5:30 min/km
- To convert to min/mile: 5.5 × 1.60934 = 8.85 min = 8:51 min/mile
- To convert to speed: 60 ÷ 5.5 = 10.9 km/h
Pace vs. Speed
Pace measures time per distance (e.g., 5:30 min/km). Speed measures distance per time (e.g., 10.9 km/h). They are inverses of each other.
Runners prefer pace because it directly answers "how long will this take?" during a run. You check your watch, see 5:30 on the last kilometer split, and know you're on track. Speed is more common in cycling, driving, and scientific contexts.
Conversion Formulas
- Pace → Speed: Speed (km/h) = 60 ÷ Pace (min/km)
- Speed → Pace: Pace (min/km) = 60 ÷ Speed (km/h)
- min/km → min/mile: Multiply by 1.60934
- min/mile → min/km: Divide by 1.60934
Quick Reference
| Pace (min/km) | Pace (min/mi) | Speed (km/h) | Speed (mph) |
|---|---|---|---|
| 4:00 | 6:26 | 15.0 | 9.3 |
| 4:30 | 7:15 | 13.3 | 8.3 |
| 5:00 | 8:03 | 12.0 | 7.5 |
| 5:30 | 8:51 | 10.9 | 6.8 |
| 6:00 | 9:39 | 10.0 | 6.2 |
| 6:30 | 10:28 | 9.2 | 5.7 |
| 7:00 | 11:16 | 8.6 | 5.3 |
| 7:30 | 12:04 | 8.0 | 5.0 |
| 8:00 | 12:53 | 7.5 | 4.7 |
Common Race Distances
| Race | Distance (km) | Distance (mi) | Finish at 5:00/km | Finish at 6:00/km | Finish at 7:00/km |
|---|---|---|---|---|---|
| 5K | 5.0 | 3.11 | 25:00 | 30:00 | 35:00 |
| 10K | 10.0 | 6.21 | 50:00 | 1:00:00 | 1:10:00 |
| Half Marathon | 21.0975 | 13.11 | 1:45:29 | 2:06:35 | 2:27:41 |
| Marathon | 42.195 | 26.22 | 3:30:59 | 4:13:10 | 4:55:22 |
These are theoretical times assuming constant pace with no rest. Real races involve pacing strategy, elevation, and fatigue — most runners slow in the later kilometers. Use these as planning targets and enter your own values in the calculator above for precise estimates.
Race Pace Targets
Common race time goals and the pace required to achieve them:
| Goal | Required Pace (min/km) | Required Pace (min/mi) |
|---|---|---|
| Sub-20 min 5K | 3:59 | 6:26 |
| Sub-25 min 5K | 4:59 | 8:02 |
| Sub-30 min 5K | 5:59 | 9:39 |
| Sub-50 min 10K | 4:59 | 8:02 |
| Sub-60 min 10K | 5:59 | 9:39 |
| Sub-1:45 Half | 4:58 | 8:01 |
| Sub-2:00 Half | 5:41 | 9:09 |
| Sub-3:30 Marathon | 4:58 | 8:00 |
| Sub-4:00 Marathon | 5:41 | 9:09 |
| Sub-4:30 Marathon | 6:23 | 10:17 |
| Sub-5:00 Marathon | 7:06 | 11:27 |
Common Mistakes
- Confusing pace with speed: A "faster" pace is a lower number (4:30/km is faster than 6:00/km), while a faster speed is a higher number. Mixing these up leads to incorrect race planning.
- Starting a race too fast: Running the first kilometer 30–60 seconds faster than your target pace often leads to significant slowing later ("hitting the wall"). Even pacing or a slight negative split is more efficient.
- Ignoring the km/mile unit: A 5:00 min/km pace and a 5:00 min/mile pace are very different. 5:00/km ≈ 12 km/h. 5:00/mile ≈ 19.3 km/h — that's competitive racing pace. Always check the unit.
- Assuming constant pace for long races: Most runners slow by 5–15% in the second half of a marathon. A calculator gives theoretical times; actual race performance includes fatigue, nutrition, and mental factors.
- Not accounting for elevation: Running at 6:00/km pace on flat ground requires significantly more effort uphill. If your route has hills, your average pace will be slower than your flat-ground target.
Frequently Asked Questions
What is running pace?
Running pace is the time it takes to cover one unit of distance — usually expressed as minutes per kilometer (min/km) or minutes per mile (min/mi). For example, a 5:30 min/km pace means you cover one kilometer every 5 minutes and 30 seconds. Pace is the inverse of speed: a faster pace means a lower number.
How do I calculate my running pace?
Divide your total time by the distance. For example, if you ran 5 km in 27 minutes and 30 seconds (27.5 minutes), your pace is 27.5 ÷ 5 = 5.5 minutes per km, or 5:30 min/km. Use the calculator above or apply the formula: Pace = Time ÷ Distance.
How do I convert min/km to min/mile?
Multiply the min/km pace by 1.60934 (the number of kilometers in a mile). For example, 5:00 min/km × 1.60934 = 8:03 min/mile. To convert in the other direction, divide the min/mile pace by 1.60934.
How do I convert pace to speed?
Divide 60 by the pace in minutes. A pace of 5:00 min/km equals 60 ÷ 5 = 12.0 km/h. A pace of 8:00 min/mile equals 60 ÷ 8 = 7.5 mph. The conversion works because pace and speed are mathematical inverses.
What is a good running pace for beginners?
Most beginner runners start between 7:00 and 9:00 min/km (11:15 to 14:30 min/mile). A "conversational pace" — where you can speak in full sentences while running — is a useful guideline for easy training runs. Pace varies by fitness level, age, terrain, and weather conditions.
What pace do I need to run a sub-4-hour marathon?
A marathon is 42.195 km. To finish in under 4 hours, you need a pace faster than 5:41 min/km (9:09 min/mile). Many runners target 5:35 min/km (8:59 min/mi) to build in a buffer for slower kilometers.
What pace do I need for a sub-2-hour half marathon?
A half marathon is 21.0975 km. To finish under 2 hours, you need a pace faster than 5:41 min/km (9:09 min/mile) — the same pace threshold as a sub-4 marathon, but over half the distance.
What is the difference between pace and speed?
Pace is time per distance (e.g., 5:30 min/km). Speed is distance per time (e.g., 10.9 km/h). They are inverses. Runners prefer pace because it relates directly to effort and split timing during a run.
What is negative splitting?
A negative split means running the second half of a race faster than the first half. For example, running the first half of a marathon in 2:02 and the second half in 1:58. This strategy avoids the early fatigue that comes from starting too fast and is widely considered more efficient for distance running.
How does elevation affect running pace?
Uphill running increases effort and slows pace. A rough estimate is that pace slows by about 15–20 seconds per kilometer for every 1% of average incline grade. Downhill sections can partially offset the time lost, but steep descents stress the legs differently and rarely recover the full time.
Does this calculator store my data?
No. All calculations run entirely in your browser using JavaScript. No data is sent to any server, and nothing is stored.
Related Tools
- Calories Burned Calculator — estimate calories burned during your run
- Steps to Miles Converter — convert step count to distance
- Time Unit Converter — convert between hours, minutes, and seconds
- Kilometers to Miles — quick distance conversion
- Countdown Timer — time your intervals or rest periods
- BMI Calculator — check body mass index
- How to Calculate Running Pace — in-depth guide with formulas, race pacing strategy, and common mistakes
Privacy & Limitations
- Client-side only. No data is sent to any server. No cookies, no tracking of values entered. All calculations run in your browser.
- Assumes constant pace. Real-world running involves variable effort. This calculator models a steady pace for estimation. Actual race times depend on fitness, pacing strategy, elevation, and conditions.
- Does not account for elevation, wind, or temperature. Heat, headwinds, and hills all increase effort at a given pace.
- Not training advice. This tool is a math utility. It calculates pace, time, and distance relationships. For training plans or health-related decisions, consult a qualified coach or healthcare professional.
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Pace Calculator FAQ
What is running pace?
Running pace is the time it takes to cover one unit of distance — usually expressed as minutes per kilometer (min/km) or minutes per mile (min/mi). For example, a 5:30 min/km pace means you cover one kilometer every 5 minutes and 30 seconds. Pace is the inverse of speed: a faster pace means a lower number.
How do I calculate my running pace?
Divide your total time by the distance. For example, if you ran 5 km in 27 minutes and 30 seconds (27.5 minutes), your pace is 27.5 ÷ 5 = 5.5 minutes per km, or 5:30 min/km.
How do I convert pace from min/km to min/mile?
Multiply the min/km pace by 1.60934 (the number of kilometers in a mile). For example, 5:00 min/km × 1.60934 = 8:03 min/mile. To convert the other direction, divide the min/mile pace by 1.60934.
How do I convert pace to speed (km/h or mph)?
Divide 60 by the pace in minutes. For example, a pace of 5:00 min/km equals 60 ÷ 5 = 12.0 km/h. A pace of 8:00 min/mile equals 60 ÷ 8 = 7.5 mph.
What is a good running pace for beginners?
Most beginner runners start at a pace between 7:00 and 9:00 min/km (11:15 to 14:30 min/mile). A comfortable conversational pace — where you can speak in full sentences — is a good target for building endurance. Pace varies widely based on fitness, age, terrain, and conditions.
What pace do I need to run a sub-4-hour marathon?
A marathon is 42.195 km (26.22 miles). To finish in under 4 hours, you need a pace faster than 5:41 min/km or 9:09 min/mile, sustained for the entire distance. In practice, many runners aim for a 5:35 min/km (8:59 min/mi) target pace to build in a small buffer.
What pace do I need for a sub-2-hour half marathon?
A half marathon is 21.0975 km (13.11 miles). To finish in under 2 hours, you need a pace faster than 5:41 min/km or 9:09 min/mile — the same pace threshold as a sub-4 marathon, but sustained for half the distance.
What is the difference between pace and speed?
Pace is time per unit of distance (e.g., 5:30 min/km). Speed is distance per unit of time (e.g., 10.9 km/h). They are inverses of each other. Runners typically use pace because it's easier to control during a run — you can glance at your watch and check your split time per kilometer or mile.
What is negative splitting?
A negative split means running the second half of a race faster than the first half. For example, running the first half of a marathon in 2:02 and the second half in 1:58. Negative splitting is widely considered a more efficient race strategy because it avoids early fatigue from starting too fast.
How does elevation affect running pace?
Uphill running increases effort and slows pace. A common estimate is that pace slows by about 15–20 seconds per kilometer for every 1% of incline grade, though this varies by fitness level and terrain. Downhill sections can partially compensate, but steep descents stress the legs differently and don't fully recover the time lost climbing.
Does this calculator store my data?
No. All calculations run entirely in your browser using JavaScript. No data is sent to any server, and nothing is stored.