Running Split Calculator
Plan your race splits mile-by-mile or km-by-km. Choose even, negative, or positive split strategies for 5K, 10K, half marathon, or marathon.
Running Pace Calculator
Convert between running pace (min/mi, min/km) and speed (mph, km/h). Calculate finish times for any distance from your pace or speed.
min
sec
Pace (min/mile)
8:30
Pace (min/km)
5:17
7.06 mph11.36 km/h
Estimated Finish Times
1 Mile
8:30
5K
26:24
10K
52:49
15K
1:19:13
Half Marathon
1:51:26
Marathon
3:42:52
Pace / Speed Conversion Chart
| min/mile | min/km | mph | km/h | 5K | Marathon |
|---|---|---|---|---|---|
| 6:00 | 3:44 | 10 | 16.1 | 18:38 | 2:37:19 |
| 7:00 | 4:21 | 8.6 | 13.8 | 21:45 | 3:03:32 |
| 8:00 | 4:58 | 7.5 | 12.1 | 24:51 | 3:29:45 |
| 9:00 | 5:36 | 6.7 | 10.8 | 27:58 | 3:55:58 |
| 10:00 | 6:13 | 6 | 9.7 | 31:04 | 4:22:11 |
| 11:00 | 6:50 | 5.5 | 8.9 | 34:11 | 4:48:24 |
| 12:00 | 7:27 | 5 | 8 | 37:17 | 5:14:37 |
| 13:00 | 8:05 | 4.6 | 7.4 | 40:23 | 5:40:51 |
| 14:00 | 8:42 | 4.3 | 6.9 | 43:30 | 6:07:04 |
| 15:00 | 9:19 | 4 | 6.4 | 46:36 | 6:33:17 |
Note: Finish time estimates assume constant pace over the entire distance. Actual race times may vary due to terrain, weather, fatigue, and pacing strategy.
Planning notes, formulas, and examples
About the Running Pace Calculator
Running pace is the time it takes to cover a specific distance, usually shown as minutes per mile or minutes per kilometer.
This calculator converts between pace, speed, time, and distance, and shows equivalent finish times for standard race distances. It supports both imperial and metric units.
Use it for common running conversions, whether you are planning training paces, treadmill speeds, or race goals.
When This Page Helps
It is useful for checking training targets, translating treadmill speed to pace, or turning a goal time into pace. The race-time outputs are convenient planning estimates, but course profile and conditions still matter.
How to Use the Inputs
- Enter your known pace (min/mile or min/km) OR speed (mph or km/h).
- The calculator quickly converts to all other formats.
- View estimated finish times for 5K, 10K, half marathon, and marathon.
- Use the pace chart to see a range of paces and their equivalents.
- Adjust inputs to plan training targets or race goals.
Formula used
Pace (min/mile) = 60 / speed (mph)
Pace (min/km) = 60 / speed (km/h)
Speed (mph) = 60 / pace (min/mile)
Speed (km/h) = speed (mph) × 1.60934
Finish time = pace × distance
5K = 3.107 miles, 10K = 6.214 miles
Half Marathon = 13.109 miles, Marathon = 26.219 milesExample Calculation
Result: 8:30/mi = 5:17/km = 7.06 mph = 11.35 km/h | Marathon: 3:43:51
A pace of 8:30 per mile equals 5:17 per kilometer, or 7.06 mph (11.35 km/h). At this pace, a 5K would take 26:25, a 10K would take 52:49, a half marathon 1:51:26, and a full marathon 3:43:51. This is a solid recreational running pace.
Tips & Best Practices
- Most daily training should be 1–2 minutes slower than your race pace.
- A 10-second per mile change in pace affects a marathon finish by about 4 minutes.
- Use GPS watches for real-time pace tracking, but note they're less accurate on curves and hills.
- Pace naturally slows on hills. Aim for consistent effort rather than consistent pace on hilly courses.
- Negative splitting (running the second half faster) is the most efficient race strategy.
- Temperature above 60°F (16°C) slows pace by approximately 1–3% per 10°F increase.
Training Pace Zones
Most coaches divide training into pace zones: easy (conversational, 1–2 min slower than race pace), tempo (comfortably hard, about 25–30 seconds slower than 5K pace), interval (fast, close to 5K pace or faster), and repetition (near-maximum speed for short bursts). Using a pace calculator helps translate these zones into concrete targets for your GPS watch.
Race Pace Strategy
The most common mistake in racing is starting too fast. Even 10 seconds per mile faster than planned in the first few miles can lead to significant slowdown later (especially in the marathon). Use a pace calculator to set your target split times and practice running at that pace during training.
Pace and Heart Rate
Pace and heart rate are complementary metrics. On flat terrain with mild weather, pace is more actionable. On hills, in heat, or when fatigued, heart rate provides better guidance for effort level. The best runners use both metrics together for optimal training.
Sources & Methodology
Last updated:
Methodology
This worksheet converts between pace, speed, distance, and finish time using fixed unit conversions and simple distance multiplication. It is intended for training and race planning rather than as a coaching prescription. The race-distance outputs assume flat-course math and do not account for hills, weather, or fatigue distribution.
Sources
- Daniels' Running Formula (Human Kinetics) — Used here for pace interpretation and race-planning context, not for the raw unit conversions.
- SI Units and metric conversion guidance (National Institute of Standards and Technology (NIST)) — Reference context for the miles/kilometers and speed conversions used by the calculator.
Frequently Asked Questions
It depends on age, sex, fitness, and experience. For recreational runners, 9–12 min/mile is common. Competitive amateurs run 7–9 min/mile. Sub-elite runners typically pace 5:30–7:00 min/mile. The most important pace is one that matches YOUR training goals and fitness level.
Pace is time per distance (minutes per mile or km) — lower is faster. Speed is distance per time (mph or km/h) — higher is faster. Runners prefer pace because it directly tells you how long each mile/km takes, making it easier to plan runs and splits.
Divide your min/mile pace by 1.60934. For example, 8:00/mile ÷ 1.60934 = 4:58/km. Going the other way, multiply min/km by 1.60934. This calculator handles both conversions automatically.
Generally, no. Most runners slow down as distance increases. A common rule is that pace slows by about 5–7% when doubling the race distance. Your 10K pace will be about 5% slower than your 5K pace. Marathon pace is typically 10–15% slower than 10K pace.
Uphill running slows pace significantly — roughly 15–30 seconds per mile for each 1% gradient. Downhill running speeds pace up, but less than the uphill penalty. On a hilly course, focus on maintaining consistent heart rate/effort rather than consistent pace.
A sub-4-hour marathon requires a pace of 9:09/mile or faster (5:41/km). Accounting for bathroom stops, water stations, and crowd navigation, aim for a target pace of 9:00/mile to build in a small buffer.
More in this topic
Race Time Predictor Calculator
Predict your finish times for 5K, 10K, half marathon, marathon, and custom distances using the Riegel and Cameron formulas from a known race result.
Marathon Pace Calculator
Calculate your ideal marathon pace per mile and per kilometer from a target finish time, with mile-by-mile split tables and negative-split strategies.