Race Pace Converter
Convert your running pace between min/mile, min/km, mph, and kph in one tool. Predict equivalent race times across distances using the Riegel formula. Understand pace adjustment factors for altitude and heat.
Pace Unit Converter
Enter a value in any format and see all conversions instantly
Conversions
Min / Mile
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Min / Km
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MPH
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KPH
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Pace Adjustment Factors Between Distances
Your pace naturally slows as race distance increases. Here are the typical conversion multipliers between common race distances. These are approximations based on average runners. Elite runners tend to have smaller gaps between distances because they have highly developed aerobic systems.
Your 10K time is roughly double your 5K time plus a small fatigue factor. A 25:00 5K predicts about a 52:00 to 53:00 10K.
Multiply your 5K time by about 4.7 to estimate your half marathon time. A 25:00 5K suggests about a 1:56 to 1:59 half.
Multiply your 5K by about 10 for a rough marathon estimate. A 25:00 5K projects a 4:05 to 4:15 marathon.
Double your half marathon time and add 5 to 10%. A 2:00 half suggests a 4:12 to 4:24 marathon.
Your half marathon time is roughly 2.25 times your 10K. A 50:00 10K predicts about a 1:51 to 1:54 half.
Treadmill Speed to Outdoor Pace
If you train on a treadmill and want to know your equivalent outdoor pace, here is a quick reference. Treadmill speed is shown in mph. Setting a 1% incline on the treadmill approximates the air resistance you face outdoors.
For a complete treadmill conversion tool with custom speeds and inclines, use our treadmill pace converter.
Altitude and Heat Pace Adjustments
Environmental conditions significantly affect your running pace. When converting or predicting race times, it is important to account for altitude and temperature. Here are the research-based adjustment guidelines that coaches and race directors use.
Altitude Adjustments
Sea level to 2,000 ft: No adjustment needed
2,000 to 3,500 ft: 2 to 4% slower
3,500 to 5,000 ft: 4 to 7% slower
5,000 to 7,500 ft: 7 to 12% slower
7,500 to 10,000 ft: 12 to 18% slower
Full acclimatization takes 2 to 3 weeks. If you travel to altitude for a race, arrive early or expect slower times.
Heat Adjustments
50 to 60F (10 to 16C): Ideal conditions, no adjustment
60 to 70F (16 to 21C): 1 to 2% slower
70 to 80F (21 to 27C): 3 to 5% slower
80 to 90F (27 to 32C): 5 to 10% slower
90F+ (32C+): 10 to 20% slower, risk of heat illness
High humidity amplifies the heat effect. At 80% humidity, add an extra 2 to 3% to the adjustment.
How This Pace Converter Works
The unit converter handles four formats: minutes per mile, minutes per kilometer, miles per hour, and kilometers per hour. Enter any one value and the tool calculates the other three instantly. The conversion between miles and kilometers uses the factor 1.60934. Speed and pace are inversely related: pace = 60 / speed for the same unit system.
The race equivalent calculator uses the Riegel formula, developed by Peter Riegel and published in Runner's World in 1977. The formula is T2 = T1 x (D2 / D1) raised to the power of 1.06, where T1 is your known time, D1 is the known distance, D2 is the target distance, and T2 is the predicted time. The exponent 1.06 is an empirically derived fatigue factor that accounts for the non-linear relationship between distance and performance.
This converter is different from our treadmill pace converter (which focuses on treadmill speed settings) and our race pace calculator (which focuses on finish time predictions with split tables). This tool is specifically designed for quick unit conversions and cross-distance pace comparisons.
Convert Pace to Territory
Your pace in any unit still earns you territory. Motera tracks your runs automatically while you capture land on a real map, explore through Fog of War, and climb the leaderboard. Every run counts, regardless of the unit you measure it in.
Join thousands of runners who have turned their training into a strategy game. Your pace data powers every move.
MoteraFrequently Asked Questions
How do I convert min/mile to min/km?
Divide your pace in minutes per mile by 1.60934. For example, a 9:00 per mile pace equals about 5:35 per kilometer. The converter on this page does this math instantly for you. You can also multiply your min/km pace by 1.60934 to get min/mile.
What is the Riegel formula?
The Riegel formula (T2 = T1 x (D2/D1)^1.06) predicts your race time at one distance based on a performance at another distance. It was developed by researcher Peter Riegel in 1977 and remains one of the most widely used race prediction methods. The exponent 1.06 accounts for the fact that you slow down as race distance increases.
Why is my marathon pace so much slower than my 5K pace?
A 5K is short enough that you can rely on a mix of aerobic and anaerobic energy systems. A marathon is almost entirely aerobic, which produces energy more slowly. Additionally, glycogen depletion, muscle fatigue, and the mental demands of running for 3 to 5 hours all contribute to a slower pace. Most runners see a slowdown of 45 to 90 seconds per mile between their 5K pace and marathon pace.
How does altitude affect running pace?
At higher altitudes, the air contains less oxygen, which forces your body to work harder. A general guideline is that for every 1,000 feet (305 meters) above sea level, your pace slows by about 1.5 to 2% for distances of 5K and longer. At 5,000 feet, expect to run about 7 to 10% slower than at sea level. Full acclimatization takes 2 to 3 weeks.
How does heat affect running pace?
Heat has a significant impact on performance. For every 10 degrees Fahrenheit above 55F (13C), expect your pace to slow by about 1.5 to 3%. At 80F (27C), most runners are 4 to 8% slower than in ideal conditions. High humidity makes the effect even worse because your body cannot cool itself through evaporation as effectively.
Is treadmill pace the same as outdoor pace?
Treadmill running eliminates wind resistance and maintains a perfectly flat surface, making it slightly easier than outdoor running at the same speed. A 1% incline on the treadmill roughly compensates for the lack of wind resistance. Beyond that, the paces are comparable. Use our treadmill pace converter for exact speed-to-pace conversions.
How accurate are race time predictions?
Predictions are most accurate when the input race was recent (within 2 to 4 weeks), you were healthy during that race, and the target distance is within a reasonable range. Predicting a marathon time from a 5K result is less accurate than predicting a 10K time from a 5K result. Training, course conditions, and weather all introduce variability.
What pace conversion do I need for a treadmill?
Treadmills display speed (mph or kph) rather than pace (min/mile or min/km). To convert: pace in min/mile = 60 divided by mph. For example, 6.0 mph on a treadmill equals 10:00 per mile. The unit converter on this page handles this conversion in both directions.
