Average Lap Speed Calculator
Enter your lap time and the track length to get the average speed in both mph and km/h. Works with track lengths in miles or kilometres.
How to calculate average lap speed
- Enter the track length in miles or kilometres.
- Enter your lap time in seconds.
- Read the average speed in mph and km/h.
Examples
2.5 mile lap in 75 seconds
2.5 mi, 75 s
120 mph (193.12 km/h)
4 km lap in 90 seconds
4 km, 90 s
99.42 mph (160 km/h)
Frequently asked questions
How is average lap speed calculated?
Average speed in mph equals the track length in miles divided by the lap time in hours, where lap time in hours is the lap seconds divided by 3600. A kilometre length is converted to miles first.
How do you convert mph to km/h?
Multiply miles per hour by 1.609344 to get kilometres per hour. The tool shows both figures so you do not need to convert by hand.
Is this the same as top speed?
No. Average lap speed blends the full lap, including corners and braking, so it is lower than the peak speed reached on the straights.
What lap time format should I use?
Enter the lap time in plain seconds. For a 1 minute 15 second lap, enter 75. For 1 minute 30, enter 90.
Can I get the lap time from a target speed instead?
Yes, use the lap time calculator. It takes a track length and an average speed and returns the lap time and total race time.
Related tools
Lap Time Calculator
Calculate lap time from track length and average speed, then total race time across every lap. Free lap time and race pace calculator.
Race Fuel Calculator
Calculate race fuel with a safety margin, plus laps per stint and pit stops from your tank size. Free fuel strategy calculator for any race.
Pit Stop Time Calculator
Calculate the time lost to pit stops from the pit lane delta and service time, across one or more stops. Free pit stop time loss calculator.
Car Depreciation Calculator
Estimate what your car will be worth after a number of years. Enter the purchase price and annual depreciation rate to see future value and total loss.
Compression Ratio Calculator
Calculate static compression ratio from swept and clearance volume, or from bore and stroke. Enter chamber cc to get your CR. Free engine CR calculator.
Engine Displacement Calculator
Calculate total engine displacement from bore, stroke and cylinder count. Get the result in cc, litres and cubic inches. Free engine size calculator.