Speed Distance Time Calculator

Enter any two values and calculate the third instantly. Supports multiple units including mph, km/h, metres per second, miles, kilometres, and more.

Speed, Distance & Time Calculator
Leave blank to calculate speed.
Leave blank to calculate distance.
h
m
s
Leave blank to calculate time.
Formula Reference
Speed
Speed = Distance ÷ Time
Distance
Distance = Speed × Time
Time
Time = Distance ÷ Speed
How to Use This Calculator
  1. Choose what you want to calculate — Speed, Distance, or Time using the buttons at the top.
  2. Enter the two known values — Fill in speed and distance to find time, speed and time to find distance, or distance and time to find speed.
  3. Select your units — Choose from mph, km/h, m/s, miles, kilometres, and more using the unit dropdowns.
  4. Click Calculate — See your result instantly along with all common unit conversions.
Tip: For running or cycling, use the min/km or min/mile pace units. Enter your pace as speed to calculate finish times for races.
Frequently Asked Questions

Speed = Distance ÷ Time. For example, if you travel 120 km in 2 hours, your speed is 120 ÷ 2 = 60 km/h. Make sure your units are consistent — if distance is in miles and time in hours, you get miles per hour (mph).

Distance = Speed × Time. For example, travelling at 60 mph for 2.5 hours covers 60 × 2.5 = 150 miles. If time is given in minutes, convert to hours first by dividing by 60.

Time = Distance ÷ Speed. For example, at 50 mph covering 200 miles takes 200 ÷ 50 = 4 hours. The result will be in hours if distance is in miles and speed in mph.

Multiply km/h by 0.621371 to get mph. For example, 100 km/h × 0.621371 ≈ 62.14 mph. Alternatively, divide km/h by 1.60934. This calculator handles unit conversions automatically.

Average speed = Total Distance ÷ Total Time. Note that average speed is not the same as the average of two speeds. If you drive 60 mph for 1 hour and 40 mph for 1 hour, your average speed is (60+40)/2 = 50 mph. But if you drive 60 mph for 60 miles and 40 mph for 60 miles, your average speed is 120 ÷ (1 + 1.5) = 48 mph.
Common Speed Reference
Speed mph km/h
Walking35
Jogging610
Cycling1220
UK motorway70113
UK national road6097
Urban road3048
Sound7671,235
Quick Unit Conversions
  • 1 mph = 1.60934 km/h
  • 1 km/h = 0.621371 mph
  • 1 m/s = 3.6 km/h = 2.23694 mph
  • 1 knot = 1.15078 mph = 1.852 km/h
  • 1 mile = 1.60934 km = 1,609.34 m
  • 1 km = 0.621371 miles = 1,000 m
  • 1 nautical mile = 1.15078 miles = 1.852 km
Running Pace Reference
Pace (min/km) Speed
4:00 min/km15.0 km/h
5:00 min/km12.0 km/h
6:00 min/km10.0 km/h
7:00 min/km8.6 km/h
8:00 min/km7.5 km/h
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