How do I convert mph to km/h?

Multiply miles per hour by 1.609344 to get kilometres per hour. So 60 mph is about 96.6 km/h. To go from km/h to mph, divide by the same number. A rough mental check is that km/h is always the larger number for the same speed.

A knot is one nautical mile per hour, which is about 1.852 km/h or 1.151 mph. It is used in sailing, aviation and meteorology because it ties neatly to nautical miles and lines of latitude.

How accurate are the conversions?

Each conversion uses the exact, internationally defined factor for the unit, not a rounded approximation, so the maths is precise. The result is shown to several significant figures and rounded only for display. For everyday and most professional use, the figures are exact to well beyond the precision you need.

Does this work offline and is anything sent to a server?

The conversion runs entirely in your browser, so nothing you type is sent anywhere, and once the page has loaded it keeps working with no connection. There is no sign-up and no limit on how many conversions you make.

Speed Converter

Convert speed between kilometres per hour, miles per hour, metres per second, knots and feet per second. Type a value and see it across every unit at once, exactly. A free speed converter that runs in your browser.

Exact, standard factors
100% free
No sign-up, no app
Instant as you type
Works offline after first load

Read the guide: How to Convert mph to km/h

Convert

From

0.62137119mph

1 km/h = 0.62137119 mph

1 km/h in every unit

Metre per second0.27777778 m/s

Kilometre per hour1 km/h

Mile per hour0.62137119 mph

Foot per second0.91134442 ft/s

Knot0.5399568 kn

How to use it

1
Enter a value

Type the number you want to convert. The result updates as you type, with no button to press.
2
Pick the units

Choose what you are converting from and to. Swap them with one click if you need the reverse.
3
Read or copy

See the exact result, plus a table of your value in every unit. Copy any line you need.

When it comes in handy

Driving abroad

Convert a km/h speed limit to mph, or the reverse, so you read road signs correctly.

Running and cycling

Switch a pace between km/h and mph, or work in metres per second for some training apps.

Sailing and flying

Convert knots to km/h or mph to understand wind and craft speed.

Instant, exact & 100% in your browser

The conversion runs right here in your browser using exact, standard factors. Nothing you type is sent to a server, there is no sign-up and no limit, and once the page has loaded it keeps working even with no connection.

Frequently asked questions

How do I convert mph to km/h?: Multiply miles per hour by 1.609344 to get kilometres per hour. So 60 mph is about 96.6 km/h. To go from km/h to mph, divide by the same number. A rough mental check is that km/h is always the larger number for the same speed.
What is a knot?: A knot is one nautical mile per hour, which is about 1.852 km/h or 1.151 mph. It is used in sailing, aviation and meteorology because it ties neatly to nautical miles and lines of latitude.
How accurate are the conversions?: Each conversion uses the exact, internationally defined factor for the unit, not a rounded approximation, so the maths is precise. The result is shown to several significant figures and rounded only for display. For everyday and most professional use, the figures are exact to well beyond the precision you need.
Does this work offline and is anything sent to a server?: The conversion runs entirely in your browser, so nothing you type is sent anywhere, and once the page has loaded it keeps working with no connection. There is no sign-up and no limit on how many conversions you make.