Speed, Distance and Time
Convert with explicit units, definitions and assumptions.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Unused input fields are ignored for the selected solve mode.
Example Calculation
- Solve for: Speed
- Distance: 120 km
- Duration: 2 h
- Speed: 60 km/h
120 km travelled in 2 hours has average speed 60 km/h.
Frequently asked questions
How do I use this calculator?
Enter solve for, distance, duration, speed. The result updates automatically. Use Reset to restore the example values.
What method does it use?
speed = distance/time; distance = speed × time; time = distance/speed. Unused input fields are ignored for the selected solve mode.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.