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Speed Conversion Calculator

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What is the Speed Conversion Calculator?

The Speed Converter changes a speed between kilometres per hour, miles per hour, metres per second, knots and feet per second, and also converts between speed and pace, the minutes-per-kilometre or minutes-per-mile figure runners and cyclists use. Enter a value in any unit and every other unit updates, with the exact factor shown. It runs in your browser.

How to use it

Type a speed in any of the unit boxes; the rest fill in.
Or enter a pace (for example 5:30 per km) to see the equivalent speed and the pace per mile.
Copy the value you need.

The factors

1 km/h = 0.62137 mph = 0.27778 m/s = 0.53996 knots.
1 mph = 1.60934 km/h = 0.44704 m/s.
1 knot = 1 nautical mile per hour = 1.852 km/h exactly.
Pace to speed: speed in km/h = 60 ÷ pace in minutes per km. A 5:00 pace is 12 km/h.

Quick mental conversions (mph to km/h: add 60 percent; km/h to mph: multiply by 6 and drop a digit), the running and cycling tables, and why aviation and shipping still use knots are in speed conversion without the guesswork.

Common uses

Reading a speed limit or a hire car’s dashboard abroad.
Setting a treadmill (km/h or mph) to a target race pace.
Converting wind speed between weather sources (knots, km/h, m/s).
Physics homework where m/s is required.

Related tools

Convert distances and other units with the Unit Converter, calculate elapsed time between two dates with the Age Calculator, and work out percentage improvements with the Percentage Calculator.

Read the guide

Speed Conversion Without the Guesswork: km/h, mph, Knots, and Running Pace

km/h, mph, m/s, knots and Mach with exact factors and the 5⁄8 rule for road signs, a running pace table (min/km ↔ min/mile ↔ treadmill speed), why Mach changes with altitude, and the distance-time-speed rearrangements.

Frequently asked questions

How do I convert pace per mile to pace per km?

Divide the minutes per mile by 1.609. An 8:00 mile is about 4:58 per km. The tool does this for you.

What is a knot?

One nautical mile (1,852 m) per hour, used at sea and in the air because nautical miles match lines of latitude.

Are results exact?

Yes; the factors are defined values and the tool keeps full precision.

Speed conversion tables

Common speeds with the exact factors: 1 mph = 1.609344 km/h and 1 knot = 1.852 km/h.

km/h to mph, knots and m/s

km/h	mph	knots	m/s
10	6.21	5.40	2.78
20	12.43	10.80	5.56
30	18.64	16.20	8.33
40	24.85	21.60	11.11
50	31.07	27.00	13.89
60	37.28	32.40	16.67
70	43.50	37.80	19.44
80	49.71	43.20	22.22
90	55.92	48.60	25.00
100	62.14	54.00	27.78
110	68.35	59.40	30.56
120	74.56	64.79	33.33
130	80.78	70.19	36.11
140	86.99	75.59	38.89
150	93.21	80.99	41.67
200	124.27	107.99	55.56
250	155.34	134.99	69.44
300	186.41	161.99	83.33
315	195.73	170.09	87.50
1,000	621.37	539.96	277.78

mph to km/h, knots and m/s

mph	km/h	knots	m/s
5	8.05	4.34	2.24
10	16.09	8.69	4.47
15	24.14	13.03	6.71
20	32.19	17.38	8.94
25	40.23	21.72	11.18
30	48.28	26.07	13.41
40	64.37	34.76	17.88
50	80.47	43.45	22.35
60	96.56	52.14	26.82
70	112.65	60.83	31.29
80	128.75	69.52	35.76
90	144.84	78.21	40.23
100	160.93	86.90	44.70
120	193.12	104.28	53.64