Pace Calculator
Pace and speed from distance and time.
How it works
Pace(min/km) = time ÷ distance; Speed(km/h) = distance ÷ (time/60)
E.g. 10 km in 50 min → 5:00/km pace, 12 km/h speed.
Worked example
10 km in 50 minutes: pace = 50 ÷ 10 = 5:00 /km, speed = 10 ÷ (50/60) = 12 km/h.
A 1:45 half marathon needs about 105 ÷ 21.0975 ≈ 4:59 /km.
Notes and limitations
Race pace is usually faster than training pace, but train by heart rate and perceived effort rather than hitting race pace every session. Heat and humidity naturally cost 10–20 s/km.