Speed Calculator
Enter two of distance (km), time and speed (km/h) to get the third. Speed is also shown in m/s, distance in meters and time in hours, minutes and seconds.
Formula: v = s / t
Result
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Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
FAQ
Frequently Asked Questions
How do I convert between speed units?
km/h to m/s: divide by 3.6. m/s to km/h: multiply by 3.6. mph to km/h: multiply by 1.609. Knots to km/h: multiply by 1.852.
How do I calculate travel time from distance and speed?
Time equals distance divided by speed. For example, 200 km at 80 km/h takes 2.5 hours. Remember to account for breaks, traffic, and speed limits.
How do I enter a travel time such as 1 hour 45 minutes?
Time has three separate fields for hours, minutes and seconds; the calculator converts them to hours internally (1 h 45 min = 1.75 h). So enter 1 and 45 – not 1.45 in the hours field, because 1.45 hours is only 1 h 27 min. Example: 150 km in 1 h 45 min gives 150 / 1.75 = 85.71 km/h or 23.81 m/s.
Guide
What is the Speed Calculator?
The speed calculator computes speed, distance or time from two known values and converts between units.
How does the Speed Calculator work?
Enter two of the three values: distance, time or speed. The calculator determines the third: v = s/t, s = v*t, t = s/v. Conversion between km/h, m/s, mph and knots is built in.
Key Data and Facts
v = s / t. 1 km/h = 0.2778 m/s. 1 mph = 1.609 km/h. 1 knot = 1.852 km/h. Speed of light: 299,792,458 m/s.
Step-by-Step Guide
How to calculate speed, distance or time step by step: 1. Enter two known quantities: distance (s), time (t) or speed (v). 2. Formulas: speed = distance / time (v = s / t). Distance = speed x time (s = v x t). Time = distance / speed (t = s / v). 3. Mind the units: km/h and hours give km. m/s and seconds give metres. Conversion: km/h to m/s: divide by 3.6. m/s to km/h: multiply by 3.6. 4. Calculate the average speed: v = total distance / total time. Note: the average of two speeds is not the arithmetic mean but the harmonic mean. 5. Further units: 1 mph = 1.609 km/h. 1 knot = 1.852 km/h. Speed of sound (air at 20 degrees): 343 m/s = 1,235 km/h.
Calculation Example
A car travels 210 km in 2.5 hours: v = 210 / 2.5 = 84 km/h. At 120 km/h over 350 km: t = 350 / 120 = 2.92 h = 2 h 55 min.
Sources
Official sources
Calculations are based on applicable German laws and official data:
Full methodology at Methodology.
Reviewed by Konstantin Iakovlev · Last updated:
Mathematics
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