What are common speed units?

m/s, km/h, mph, knots, feet per second.

How do I convert km/h to mph?

Multiply by approximately 0.621371. The calculator uses precise factors.

Speed Converter Calculator

Speed Converter - Solve mathematical problems with step-by-step solutions.

Speed Converter

Velocity conversions for driving, sailing, and aviation.

Value

From

Result

Mile per hour (mph)

1 Kilometer per hour = 0.621371 Mile per hour

Common Conversions

Speed

Approx. Equivalent

100 km/h

62.14 mph

1 m/s

3.6 km/h

1 Knot

1.852 km/h

Mach 1

1225 km/h

Light Speed

3.0e8 m/s

What is Speed Conversion?

Speed conversion translates rates between units like meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph). Useful in physics, transportation, and performance analysis.

Key Relations

1 m/s = 3.6 km/h
1 mph ≈ 1.60934 km/h

Example

Convert 20 m/s to km/h: 20 × 3.6 = 72 km/h.

FAQs

When to use mph?
mph is common in the US for vehicle speeds; km/h is used internationally.

Is m/s preferred?
m/s is SI and standard in scientific contexts.

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