The Running Pace Calculator converts between pace (min/km or min/mile), speed (km/h or mph), and finish time across 10 race distances (1K, 1 Mile, 5K, 10K, 15K, 10 Mile, Half Marathon, Marathon, 50K, 100K). Three modes: enter pace to see finish times, enter a target time and distance to find required pace, or enter spe..
Format: M:SS or MM:SS (minutes:seconds per kilometre)
YOUR RESULTS
PACE
5:00
min / km
SPEED
12.0
km/h
MARATHON TIME
3:30:59
PACE / km
5:00
PACE / mile
8:03
PACE PROJECTION
FINISH TIMES AT THIS PACE
| Race | Finish Time | Speed |
|---|---|---|
| 🏃 1K | 5:00 | 12.0 km/h |
| 🏃 1 Mile | 8:03 | 12.0 km/h |
| 🏃 5K | 25:00 | 12.0 km/h |
| 🏃 10K | 50:00 | 12.0 km/h |
| 🏃 15K | 1:15:00 | 12.0 km/h |
| 🏃 10 Mile | 1:20:28 | 12.0 km/h |
| 🏃 Half Marathon | 1:45:29 | 12.0 km/h |
| 🏅 Marathon | 3:30:59 | 12.0 km/h |
| 🏔️ 50K | 4:10:00 | 12.0 km/h |
| 🏔️ 100K | 8:20:00 | 12.0 km/h |
PACE REFERENCE CHART
Choose your unit system (metric km or imperial miles) and what you know. Three modes are available: 'I know my pace' (enter min/km or min/mile, select a distance), 'I have a target time' (enter hours/minutes/seconds, select a distance — calculator returns the pace needed), or 'I know my speed' (enter km/h or mph — calculator converts to pace and shows finish times).
In pace mode: type your pace in M:SS or MM:SS format (e.g. 5:00 for 5 minutes per km). Quick-select buttons provide common paces from 3:30 to 8:00 min/km. In time mode: enter hours, minutes, and seconds using the three-number inputs. In speed mode: type or use quick-select buttons for your speed in km/h or mph.
Select your race distance from 10 options (1K, 1 Mile, 5K, 10K, 15K, 10 Mile, Half Marathon, Marathon, 50K, 100K). The finish time for the selected race is shown prominently in the result panel. This is also the distance used for the pace projection chart on the right.
Read your results: pace in min/km or min/mile, speed in km/h or mph, finish time for the selected race, and your pace shown in both km and mile units simultaneously (no need to switch units). The hero result always shows pace as the primary output regardless of which mode you used.
Check the right panel: the pace projection chart shows your cumulative time from start to finish across the selected distance. The finish times table shows predictions for all 10 distances at your current pace — from 1K to 100K. The pace reference chart shows your pace highlighted against common pace benchmarks with corresponding speeds.
Running Pace Calculator — three modes: MODE 1: PACE → TIME Input: 5:00/km pace, Marathon (42.195 km) Time = 5.0 min/km × 42.195 km = 210.975 min = 210 min 58.5 sec = 3:30:59 Speed = 60 / 5.0 = 12.0 km/h = 7.46 mph Pace in miles = 5.0 × 1.60934 = 8:03/mile All distances at 5:00/km: 5K: 5.0 × 5 × 60 = 1500 sec = 25:00 10K: 5.0 × 10 × 60 = 3000 sec = 50:00 HM: 5.0 × 21.098 × 60 = 6329 sec = 1:45:29 Marathon: 5.0 × 42.195 × 60 = 12658 sec = 3:30:58 MODE 2: TIME → PACE Input: Marathon, target 3:30:00 (12,600 sec) Time in minutes = 12,600 / 60 = 210 min Pace = 210 / 42.195 = 4.976... min/km = 4:58.6 → 4:59/km Speed = 60 / 4.976 = 12.06 km/h MODE 3: SPEED → PACE Input: 12 km/h Pace = 60 / 12 = 5.0 min/km = 5:00/km = 8:03/mile INPUT CONVERSIONS: Pace "5:30" = 5 min 30 sec = 5.5 min/km Speed 8 km/h = 7:30/km = 12:04/mile = 5.0 mph 1 mile = 1.60934 km 1 km = 0.621371 miles
FORMULA REFERENCE TABLE
| Name | Formula | Description |
|---|---|---|
| Pace from time & distance | Pace (min/km) = time(min) / distance(km) | The core formula. If you ran 5K in 25 min: 25/5 = 5:00 min/km. |
| Finish time from pace | Time(sec) = pace(min/km) × distance(km) × 60 | If pace is 5:00/km and distance is 42.195km: 5 × 42.195 × 60 = 12,658.5 sec = 3:30:58. |
| Distance from pace & time | Distance(km) = time(min) / pace(min/km) | If running at 5:00/km for 60 min: 60/5 = 12 km. |
| Speed from pace | Speed(km/h) = 60 / pace(min/km) | 5:00/km = 60/5 = 12 km/h. Speed and pace are reciprocals of each other (scaled by 60). |
| Pace from speed | Pace(min/km) = 60 / speed(km/h) | 12 km/h = 60/12 = 5:00 min/km. |
| km ↔ mile pace | Pace(min/mile) = pace(min/km) × 1.60934 | 5:00/km × 1.60934 = 8:03/mile. Always multiply by 1.60934 to convert km pace to mile pace. |
| km ↔ mph | mph = km/h × 0.621371 | 12 km/h × 0.621371 = 7.46 mph. |
| Splits | Split(n) = pace × n × distance_per_split | At 5:00/km, every 5km split is 5 × 5 = 25:00. Every 10km is 50:00. |
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Last updated: April 29, 2026 · 1 mile = 1.60934 km · All race distances use official IAAF measurements