This distance calculator computes the distance covered when travelling at a constant speed for a given duration. It is useful for estimating how far you will travel on a road trip, flight or voyage, and returns results in kilometres, miles and nautical miles.

1. Enter your speed in km/h.
2. Enter the travel duration in hours and minutes.
3. Click Calculate.

Speed: 100 km/h, Duration: 3h 30min = 3.5 hours
Distance: 100 × 3.5 = 350 km = 217.5 miles = 189.0 nmi

This calculator assumes constant speed throughout the journey. Real-world travel involves acceleration, deceleration, stops and varying speeds. For a more realistic estimate, use your average speed rather than maximum speed.

• Using maximum speed instead of average speed — average speed is always lower due to stops and speed variations.
• Forgetting to convert minutes to hours — 30 minutes is 0.5 hours, not 30 hours.

How far do I travel in 2 hours at 90 km/h?

90 × 2 = 180 km = 111.8 miles.

Can I use this for air travel?

Yes. Enter the aircraft's cruising speed and flight duration to estimate the distance covered. Note that actual flight distances are affected by wind and routing.