Converters
Tool to convert speed units
Change speed between km/h, m/s, mph and knots, with all di units side by side.
Add to workspaceChoices for this device
Na only the units wey you choose this browser go remember. E no save numbers or other inputs. E go use them for new examples wey you open alone; shared links and workspace cards go keep their own choices.
Your numbers
Result dey update as you type; no Calculate button dey. All calculation dey run inside your browser.
Speed after conversion
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All units for this value
| Unit | Value wey e get |
|---|
All four units na di same speed dem describe. Di mile and knot factors below na exact definitions.
Formula
First change di original value to metres per second, then divide by di m/s factor for di unit wey you want: target = value × source factor ÷ target factor.
| Unit | Metres per second for each unit |
|---|---|
| Kilometre per hour (km/h) | 0.2777777778 (1/3.6) |
| Metre per second (m/s) | 1 |
| Mile per hour (mph) | 0.44704 |
| Knot (kn) | 0.5144444444 (1852/3600) |
1 mph = 0.44704 m/s exactly (from 1 mile = 1,609.344 m). 1 knot = 1 nautical mile per hour = 1,852 m per hour, exactly.
Example wey show the calculation
100 km/h = 100 × (1/3.6) = 27.777778 m/s, and 27.777778 ÷ 0.44704 = 62.137119 mph. Di same speed na 27.777778 ÷ 0.5144444444 = 53.995680 knots.
Where e fit work and limits
Di page no dey accept negative speed because e no dey calculate direction. Only use signed values where you dey track direction yourself. Dem round di displayed values to 6 decimal places; di actual calculation no dey rounded.
Questions wey people dey ask often
100 km/h na how fast for mph?
62.137119 mph — the worked example above dey show every step.
Wetin be knot?
Na one nautical mile per hour. One nautical mile na exactly 1,852 m, so 1 knot = 0.5144444444 m/s. Na standard unit for sea travel and aviation.
Why mph no be round number for m/s?
Because di mile (1,609.344 m) no divide evenly by di hour: 1,609.344 ÷ 3,600 = 0.44704 m/s exactly.
To change km/h to mph, na just multiply by 0.62?
Na approximation: di exact factor na 0.6213711922. If you multiply by 0.62, 100 km/h go give 62 mph. E close, but e low by 0.137 mph.
I fit convert pace (minutes per km)?
No. Pace na di inverse of speed, so e need im own calculation. Dis page only dey change speed units.
Other tools wey relate to dis
- Tool to convert length units — convert between metres, kilometres, centimetres, millimetres, inches, feet and miles
- Calculator for Fuel Use — litres per 100 km, km per litre and MPG
- Converter for weight units — convert kilograms, grams, pounds and ounces
Results na estimates; dem no replace advice from qualified professional.