PaceLab
How fast can humans run?
Compare the fastest performances in running and see what each time means as pace and speed.
“Different distances. Different intensities. One question: how fast can we go?”
The pace behind world records
Ratified outdoor world records. Pace and speed are calculated from each official time.
100 metresTrackRatified world record
9.58 s
37.58 km/h
23.35 mph
Usain BoltBerlin, 2009
JAM
Acceleration, speed and control
In this event, acceleration, peak speed and the ability to slow down as little as possible decide the result. Usain Bolt completed the distance in 9.58 s in 2009.
- Average pace
- 1:36 /km
- Estimated peak speed
- 44.70 km/h
- Wind
- +0.9 m/s
Source: World Athletics · data checked on 12 September 2026.
Project your time over each distance
Enter a pace to calculate the equivalent time from 100m to the marathon.
These times are estimates based on the pace entered, not performance predictions.
- 100 m0:27
- 200 m0:54
- 400 m1:48
- 800 m3:36
- 1000 m4:30
- 1 mile7:15
- 5 km22:30
- 10 km45:00
- Half1:34:56
- Marathon3:09:53
The pace behind race goals
Choose a distance from the 5K to the marathon and see the average pace required for each finish-time target.
Results updated: goals for 5K in min/km.
- Goal: Sub-30 Average pace: 6:00 /kmAverage speed: 10.00 km/h
- Goal: Sub-25 Average pace: 5:00 /kmAverage speed: 12.00 km/h
- Goal: Sub-22 Average pace: 4:24 /kmAverage speed: 13.64 km/h
- Goal: Sub-20 Average pace: 4:00 /kmAverage speed: 15.00 km/h
- Goal: Sub-18 Average pace: 3:36 /kmAverage speed: 16.67 km/h
- Goal: Sub-17 Average pace: 3:24 /kmAverage speed: 17.65 km/h
- Goal: Sub-16 Average pace: 3:12 /kmAverage speed: 18.75 km/h
- Goal: Sub-15 Average pace: 3:00 /kmAverage speed: 20.00 km/h
Each displayed pace is a rounded average for the time shown. To finish under the target time, run slightly faster than the displayed value.
How pace and speed relate
The less time each kilometre takes, the higher the speed. At faster paces, every second requires a larger increase in speed.
Speed (km/h)
Common examples
Understand the numbers behind running
Four explanations covering human speed, animals, racing surfaces and pace maths.
How fast can a human run?Average speed and peak speed are not the same measurement.
About 44.7 km/h. That is the estimate for Usain Bolt’s fastest 20-metre section during his 2009 100m record. Across the full race, completed in 9.58 seconds, he averaged 37.6 km/h. So 44.7 km/h represents a brief peak, not a speed a human can sustain.
Could you outrun a cheetah?Top speed and endurance answer different questions.
Not by running away in a straight line. A cheetah can approach 100 km/h in a short burst, more than twice the estimated human peak. A person would only have a chance because of external factors such as a head start, obstacles, shelter or the animal abandoning the chase — never by being faster. Human endurance matters over long distances, not in a short escape.
Why the 5000 m and 5K are different eventsThe same distance can belong to two separate events.
The 5000 m and 5K cover the same distance but are separate events. The first is run on a measured track; the second on a certified road course with its own turns and elevation. World Athletics ratifies them separately, just as it does for the 10,000 m and 10K.
The faster you run, the more speed each second costs.The relationship between pace and speed is inverse, not linear.
Cutting 30 seconds per kilometre does not always require the same increase in speed. Going from 6:00 to 5:30 min/km means rising from 10.0 to 10.91 km/h. Going from 3:30 to 3:00 min/km, however, requires a jump from 17.14 to 20.0 km/h. The faster the pace, the greater the speed increase needed to cut the same number of seconds.