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Speed, Distance and Time Calculator

Find the travel time, average speed or distance from the other two, in km/h, mph or metres per second.

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Time

3 h 48 min

In decimal hours
3.8 hours

380 km at 100 km/h takes 3 h 48 min, not counting stops.

How it's worked out

  1. Time = distance ÷ speed380 km ÷ 100 km/h3.8 h

The formula

Speed = distance ÷ time · Distance = speed × time · Time = distance ÷ speed

Worked example

380 km at 100 km/h takes 380 ÷ 100 = 3.8 hours: 3 hours 48 minutes. Covering the same 380 km in 3 hours 30 minutes is an average of 108.6 km/h.

Questions people ask

What is the formula for speed?

Speed = distance ÷ time. Distance = speed × time, and time = distance ÷ speed.

How long does 380 km take at 100 km/h?

3.8 hours, which is 3 hours 48 minutes, before stops.

How do I turn decimal hours into minutes?

Multiply the decimal part by 60. 0.8 hours is 48 minutes.

Formula and rules last checked 25 October 2026Written and tested by the CalcPenguin teamReport a problem