How to Calculate Speed, Distance, and Time

Speed, distance, and time are related by the fundamental formula: Speed = Distance / Time. If you know any two of these values, you can calculate the third. This calculator supports multiple units and automatically converts between them.

Common Use Cases

• Travel planning: How long will a 300 km road trip take at 100 km/h? (3 hours)
• Running pace: If you run 5 km in 25 minutes, your speed is 12 km/h (7.46 mph)
• Cycling distance: Cycling at 20 km/h for 1.5 hours covers 30 km
• Unit conversion: Convert between km/h, mph, and m/s instantly

Understanding Units

The most common speed units are kilometers per hour (km/h) used in most countries, miles per hour (mph) used in the US and UK, and meters per second (m/s) used in science. This calculator handles all conversions automatically so you can mix and match units as needed.