Unit conversion / Speed

Speed converter

One knot is one nautical mile per hour. These are constant-speed unit conversions; they do not estimate travel time or account for stops.

THE CONVERTER

Speed

Instant results
0.621371192237

Decimals and scientific notation supported.

THE WORKING

1 km/h = 0.621371192237 mph

12 significant digits
THE COLLECTION

What are you measuring?

12 ways to find your answer
AT A GLANCE

Speed reference

One knot is one nautical mile per hour. These are constant-speed unit conversions; they do not estimate travel time or account for stops.

Selected value in every speed unit
UnitEquivalent
Meters per secondm/s0.277777777778
Kilometers per hourkm/h1
Miles per hourmph0.621371192237
Knotskn0.539956803456
Feet per secondft/s0.911344415281
A LITTLE CONTEXT

From a number
to an answer.

01

Choose the right family

Length, weight, temperature and more. Units must measure the same kind of quantity.

02

Set your units

Choose where you're starting and where you want to go. Use the arrows to swap direction.

03

See the whole picture

Read the result, check the working, or compare your value across the reference table.

How precise are the results?

We display up to 12 significant digits. Very small or large values use scientific notation. Floating-point arithmetic and rounded definitions can introduce small differences.

Does this work without JavaScript?

Yes. Enter your value, choose your units and press Convert. With JavaScript, the result and table update as you type.

Can I convert between different families?

Only units of the same quantity can be converted directly. For example, converting liters to kilograms requires the material's density.