What's a knot and why do ships use it?

A knot is one nautical mile per hour (1.852 km/h). It's used in maritime and aviation because nautical miles align with latitude/longitude.

How do I convert between km/h and mph?

To convert km/h to mph, multiply by 0.621371. For mph to km/h, multiply by 1.60934. For quick estimates: km/h × 0.6 ≈ mph.

What's the speed of sound in different units?

At sea level: 343 m/s = 1,235 km/h = 767 mph = 1,125 ft/s. This varies with temperature and altitude.

Speed Converter - Aviation & Racing Accuracy | Unitconvr

Convert km/h, mph, knots with pilot-grade precision. Real-time calculations, professional accuracy. Trusted by transport professionals globally.

From

Enter value

Result

Common Conversions

1 = 1

5 = 5

10 = 10

50 = 50

100 = 100

1000 = 1000

Master Speed Conversions

From snail's pace to speed of light - convert any velocity unit instantly

25+

Units Available

Yes

Real-time Conversion

99.99%

Accuracy

Overview

Speed conversion is vital in transportation, sports, physics, and meteorology. Convert between metric, imperial, nautical, and scientific speed units.

Key Features

✓25+ speed units
✓Transportation and sports
✓Scientific calculations
✓Weather and wind speeds

Common Uses by Industry

Transportation

Vehicle speeds in different regions

Aviation

Aircraft speeds in knots vs km/h

Sports

Running, cycling, and racing speeds

Meteorology

Wind speeds and weather measurements

Popular Converters

Most Used

kilometer per hour → mile per hourFeatured

1 kilometer per hour = 0.6214 mile per hour

mile per hour → kilometer per hourFeatured

1 mile per hour = 1.6093 kilometer per hour

meter per second → kilometer per hour

1 meter per second = 3.6000 kilometer per hour

kilometer per hour → meter per second

1 kilometer per hour = 0.2778 meter per second

kilometer per hour → knot

1 kilometer per hour = 0.5400 knot

knot → kilometer per hour

1 knot = 1.8520 kilometer per hour

All Converters

Browse our collection of 34 Speed converters. Each converter provides instant, accurate results for professional and academic use.