Distance Time Speed Calculator
Know two of the three and this fills in the last one. Great for "if I leave now and average 60, when do I get there?" — with units that match how you actually think about the trip.
Solve for distance, speed, or time
Enter any two and it fills in the third. Pick your units on each field — miles or kilometers, mph or km/h, hours or minutes — and it handles the conversion.
Time
2.50 hours
The one you asked it to solve for
One formula, three questions
It all comes from one relationship: distance equals speed times time. Rearrange it and you can chase whichever piece is missing. Need the time? Divide distance by speed. Need the speed you'd have to hold? Divide distance by time.
A 150-mile drive at 60 mph works out to 2.5 hours. Flip it around: cover those 150 miles in 2 hours and you were averaging 75. Same numbers, different question, and the tool handles the swap when you change what you're solving for.
The unit pickers keep it honest across systems. Enter kilometers and km/h and you'll get a clean time in hours or minutes without doing any conversion in your head — handy when the map's in one unit and your speedometer's in another.
Frequently asked questions
How do I use it?
Pick what you want to solve for, then fill in the other two fields. Want your arrival time? Choose 'time', enter the distance and your average speed, and it does the rest. The field you're solving for turns into a unit picker for the answer.
Can I mix units, like miles with km/h?
Go ahead. Each field has its own unit selector, so you can enter distance in miles, speed in km/h, and get time in minutes. Everything converts to a common base internally, so the mix doesn't trip it up.
What's the formula behind it?
The classic triangle: distance equals speed times time. Rearranged, speed is distance divided by time, and time is distance divided by speed. The tool just picks the right version based on what you're solving for.
Why do I get a dash instead of a number?
That shows up when the math can't run — usually a speed or time of zero, which would mean dividing by nothing. Give the two known values sensible positive numbers and the answer appears.
Does this account for stops and traffic?
Not on its own — it assumes a constant speed the whole way. For a real road trip, use your realistic average including stops rather than the speed limit, and you'll get an arrival estimate that's actually close.
Can I use it for running or cycling pace?
Sure. Enter your distance and time to get your average speed, or your distance and target speed to see how long it'll take. Switch the units to km and m/s if that's how you think about your training.