Speed Distance Time Calculator
Solve for speed, distance, or travel time from the other two.
Two knowns
mi
mph
hrs
Travel time
2 h 18 min
Decimal hours
2.31
One triangle, three questions
Distance = speed × time; rearrange for whichever is missing. The classic check: units must cancel — miles per hour times hours leaves miles. Mixed units (km with mph) are the number-one source of wrong answers.
Average vs. cruising speed
Trip time runs on average speed, which stops and slowdowns drag well below the cruising number — a '65 mph' highway trip often averages 55 with fuel and rest stops. Pad estimates 10–15% for honesty.
Frequently asked questions
- How does the Speed Distance Time Calculator work?
- Solve for speed, distance, or travel time from the other two.
- Is the Speed Distance Time Calculator free to use?
- Yes. The Speed Distance Time Calculator is completely free, runs entirely in your browser, and requires no account or sign-up. Your inputs never leave your device.
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