Running Pace Calculator
Calculate your running pace and project finish times for common race distances.
Pace, Speed and Time — How They Relate
Pace is time per unit distance (minutes per kilometre or mile); speed is distance per unit time (km/h or mph). They're reciprocals: a 5:00 min/km pace equals 12 km/h. Runners think in pace because race plans and training prescriptions are written that way. This calculator converts freely between pace, speed, time and distance — fill any two and it solves the rest.
Race Finish Times at Common Paces
| Pace (min/km) | 5K | 10K | Half Marathon | Marathon |
|---|---|---|---|---|
| 7:00 | 35:00 | 1:10:00 | 2:27:39 | 4:55:18 |
| 6:00 | 30:00 | 1:00:00 | 2:06:34 | 4:13:07 |
| 5:30 | 27:30 | 55:00 | 1:56:01 | 3:52:02 |
| 5:00 | 25:00 | 50:00 | 1:45:29 | 3:30:58 |
| 4:30 | 22:30 | 45:00 | 1:34:56 | 3:09:52 |
| 4:00 | 20:00 | 40:00 | 1:24:23 | 2:48:47 |
Worked Example
You want to break 50 minutes for 10K. Required pace = 50 ÷ 10 = 5:00 min/km (12.0 km/h). On a 400 m track that's exactly 2:00 per lap — an easy split to check mid-race. The calculator does the same arithmetic for any distance, including odd ones like 7.5 km trail loops.
Setting Training Paces From a Race Result
Most structured plans derive training paces from a recent race effort. Using a 10K race pace as the anchor:
| Run type | Pace vs 10K race pace | Purpose |
|---|---|---|
| Easy / long run | 60–90 s/km slower | Aerobic base, recovery between hard days |
| Tempo run | 10–15 s/km slower | Lactate threshold — sustainable "comfortably hard" |
| Interval (VO₂max) | 10–15 s/km faster | Top-end aerobic power, 3–5 min repeats |
| Repetition / strides | 25–35 s/km faster | Speed and running economy, short with full rest |
The most common training error is running easy days too fast — they should feel almost embarrassingly slow. Cross-check with heart rate using our heart rate zones calculator: easy runs belong in zone 2.
Race-Day Pacing Strategy
Even or slightly negative splits (second half marginally faster) consistently outperform fast starts — nearly every distance world record was set with even or negative splits. Practical tips: let the first kilometre be your slowest, ignore the surge at the start line, and on hilly courses pace by effort rather than the watch. GPS watches typically read 1–2% long in cities due to signal scatter, so trust the course markers late in a race.
Estimate the energy cost of your runs with the calories burned calculator — and if you're training for a marathon, fuelling that cost is as important as the pace plan itself.
Frequently Asked Questions
What is a good running pace for a beginner?
Most new runners settle between 6:30 and 8:00 min/km for continuous easy running — but the honest answer is whatever pace lets you hold a conversation. Speed comes from consistency over months, not from forcing pace early.
How do I convert treadmill pace to outdoor pace?
A flat treadmill is mechanically slightly easier than outdoor running because there's no air resistance. Setting the incline to 1% is the standard correction for speeds above ~9 km/h. Below that speed the difference is negligible.
Why is my GPS pace different from the race results?
GPS watches typically measure 1–2% extra distance from signal scatter and from not running perfect racing lines (courses are measured along the shortest possible path). Your official pace from chip timing over the certified distance is the accurate one.
Can I predict my marathon time from a 10K?
Roughly. Multiplying your 10K time by 4.66 gives a common estimate, but it assumes you've done the long-run training. Without adequate weekly mileage, real marathons come out much slower than predicted — the limiter is endurance, not speed.