Speed Converter

Convert between km/h, mph, metres per second, knots and feet per second as you type — or turn a running pace into a speed and back.

Pace is time per distance: type minutes and seconds, like 5:30.

100 km/h is 62.14 mph.

Three steps

How to convert a speed

Every field is live. Change one and the rest follow, with no button to press.

Step 1: Type in any box
Enter a speed in whichever unit you have — km/h, mph, m/s, knots or feet per second. Every other box updates as you type.
Step 2: Or enter a running pace
Type minutes and seconds per kilometre or per mile, like 5:30, and get the matching speed in every unit.
Step 3: Use the tables below
Common speeds are converted in the tables further down this page, ready to read at a glance.

Reference

Speed conversion tables

Common speeds, converted and rounded to one decimal place.

km/h to mph
km/h	mph	m/s
10	6.2	2.8
20	12.4	5.6
30	18.6	8.3
40	24.9	11.1
50	31.1	13.9
60	37.3	16.7
70	43.5	19.4
80	49.7	22.2
90	55.9	25
100	62.1	27.8
110	68.4	30.6
120	74.6	33.3
130	80.8	36.1
140	87	38.9
150	93.2	41.7
160	99.4	44.4
180	111.8	50
200	124.3	55.6

mph to km/h
mph	km/h	m/s
5	8	2.2
10	16.1	4.5
15	24.1	6.7
20	32.2	8.9
25	40.2	11.2
30	48.3	13.4
35	56.3	15.6
40	64.4	17.9
45	72.4	20.1
50	80.5	22.4
55	88.5	24.6
60	96.6	26.8
65	104.6	29.1
70	112.7	31.3
75	120.7	33.5
80	128.7	35.8
90	144.8	40.2
100	160.9	44.7

Knots to km/h and mph
knots	km/h	mph
1	1.9	1.2
5	9.3	5.8
10	18.5	11.5
15	27.8	17.3
20	37	23
25	46.3	28.8
30	55.6	34.5
40	74.1	46
50	92.6	57.5
100	185.2	115.1

The exact conversion factors

Speed units are all defined from the metre and the second, so the factors between them are exact rather than measured. The converter uses these values in full:

1 mph = 1.609344 km/h: The international mile is exactly 1,609.344 m.
1 knot = 1.852 km/h: One nautical mile per hour; the nautical mile is exactly 1,852 m.
1 m/s = 3.6 km/h: 3,600 seconds in an hour, 1,000 metres in a kilometre.
1 km/h = 0.621371 mph: Divide km/h by 1.609344 to get mph.

How to convert km/h to mph in your head

Multiply by 0.6 for a quick estimate: 100 km/h is about 60 mph (62.1 more precisely). To go the other way, multiply mph by 1.6: 70 mph is about 112 km/h (112.7 more precisely). For knots, multiply by 1.85 to get km/h, or by 1.15 to get mph.

Pace and speed

Runners usually talk in pace — the time it takes to cover a kilometre or a mile — rather than speed. Pace is the inverse of speed: a pace of 5:00 per kilometre is 12 km/h, and 6:00 per kilometre is 10 km/h. Type either into the converter above and it works out the other.

Want to measure your speed rather than convert it? The GPS speedometer reads it live from your phone, in any of these units.

Measure a speed instead of converting one

The GPS speedometer reads your speed live from your phone, in any of the units above, with a trip computer for top speed and distance.

Open the speedometer Car speed test