26.2 miles in 3h 45m 0s
- km/h
- 11.24395008
- m/s
- 3.1233194667
- Decimal hours
- 3.75
Speed Calculator
Find average speed from distance and elapsed time, then compare mph, km/h, and m/s with examples and unit checks.
Inputs explainedResult checksExample valuesRuns in your browser
Formula steps
- Convert the entered time into total seconds and decimal hours.
- Divide distance by decimal hours for miles per hour.
- Convert mph to km/h and m/s for comparison.
Examples
Recent answers
Recent speed calculations will appear here.
Speed calculations stay in this browser tab.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Speed Calculator
- Enter distance in miles and elapsed time as hours, minutes, and seconds.
- Press Calculate speed to see average mph, km/h, and m/s.
- Use zero for unused time fields.
- Remember this is average speed for the whole distance, not instant speed.
What people use it for
Find average speed for a drive, run, ride, or race.
Convert the same speed into mph, km/h, and m/s.
Check travel examples where total distance and time are known.
Compare speed with pace and distance tools.
Quick examples
Marathon
26.2 miles in 3h 45mAbout 6.99 mph
Drive
180 miles in 3h60 mph
Sprint
100 m in 12 secondsAbout 18.64 mph
Commute
18 miles in 42 minutesAbout 25.71 mph
Walk
2.5 miles in 50 minutes3 mph
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Speed CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- CalculatorsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Speed Calculator?
Use it when your task matches one of these common needs: Find average speed for a drive, run, ride, or race. Convert the same speed into mph, km/h, and m/s. It works best when you already know the measurements, amounts, units, or options the page asks for.
What is the Speed Calculator doing with my inputs?
In plain language: The calculator turns hours, minutes, and seconds into total hours, divides miles by that time to get mph, then converts the same speed to km/h and m/s using 1 mile = 1.609344 kilometers and 1 mph = 0.44704 m/s. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
What do the main Speed Calculator inputs mean?
Distance miles: the total distance covered across the whole trip or activity. Decimal miles are okay, such as 0.0621371 miles for 100 meters. Hours, minutes, seconds: the elapsed time for that same distance. Use zero for any unused field, but the total time must be more than zero. Average speed: distance divided by total time, not the fastest speed reached at one moment. Stops: include stops for whole-trip average speed, or leave them out when you only want moving average speed.
What should I double-check before trusting the answer?
This gives average speed over the whole distance. It does not show instant speed, acceleration, traffic, hills, route conditions, or pace changes, and the distance input expects miles. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
Why is my average speed lower than my fastest speed?
Average speed spreads the whole distance over the whole time. Stops, slower sections, and waiting time all lower the average even if you were moving faster for part of the trip.
Can I use kilometers or meters with this speed calculator?
The distance input is miles. Convert kilometers or meters to miles first, then enter that value. For example, 100 meters is about 0.0621371 miles, which is why the sprint example uses a small decimal distance.
Should I include stops in the time?
Include stops when you want the average speed for the whole trip from start to finish. Leave stops out when you only want moving speed for the parts where you were actually traveling.
Why does the result show mph, km/h, and m/s?
They are the same average speed in three common units. Miles per hour is common for road travel, kilometers per hour is common in many countries, and meters per second is common in science and physics problems.
Is speed the same as pace?
No. Speed is distance divided by time, such as miles per hour. Pace is time divided by distance, such as minutes per mile. Use the Pace Calculator when you want running, walking, or cycling pace.
Can this estimate arrival time?
This page starts with known distance and known time, then finds average speed. If you know speed and distance and need the missing time, use the Time Calculator or Distance Calculator instead.
How do I enter a time that is only minutes or seconds?
Put 0 in the unused fields. For 42 minutes, enter 0 hours, 42 minutes, and 0 seconds. For a 12-second sprint, enter 0 hours, 0 minutes, and 12 seconds.
How should I read the commute example?
An 18-mile commute in 42 minutes is about 25.71 mph because 42 minutes is 0.7 hours and 18 divided by 0.7 is 25.71. If those 42 minutes include lights or traffic, the result is a whole-trip average.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.