Distance Speed Time Calculator

How it works

1. 1Enter your speed in km/h (metric) or mph (imperial) and the travel duration in hours.
2. 2The calculator applies the formula d = v × t — multiplying speed by time to give distance in km or miles.
3. 3Switch between metric and imperial at any time; all values update instantly.

Use cases

• Road trips — estimate how far you will travel before your next fuel stop or rest break.
• Running and cycling pace — find out the distance covered at a given average pace over a training session.
• Travel planning — quickly compare journey distances for different speed limits or transport modes.

Frequently asked questions

What is the formula used by this calculator?

The formula is d = v × t, where d is distance, v is speed, and t is time. For example, travelling at 60 km/h for 2.5 hours gives d = 60 × 2.5 = 150 km. The formula can be rearranged as t = d ÷ v (time = distance ÷ speed) or v = d ÷ t (speed = distance ÷ time).

Why must time be entered in hours?

Because road speeds are expressed per hour (km/h or mph), multiplying by hours cancels the unit correctly: km/h × h = km. If you have minutes, divide by 60 first — for example, 90 minutes = 1.5 hours.

Can I use this calculator for running or cycling?

Yes. Enter your average pace converted to a speed (e.g. 10 km/h) and your planned duration (e.g. 0.5 h for 30 minutes). The result — 5 km — tells you the distance you will cover. The metric/imperial toggle lets you work in miles if you prefer.