Speed Converter

Speed Converter is evaluated from Speed Value and From Unit. The calculation reports Miles per Hour, Kilometers per Hour and Meters per Second.

Results

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About the Speed Converter

Speed Converter is treated here as a quantitative relation between Speed Value and From Unit and Miles per Hour, Kilometers per Hour, Meters per Second and Knots.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
All values convert through m/s as base unit:
1 mph = 0.44704 m/s
1 km/h = 1/3.6 m/s
1 knot = 0.514444 m/s
1 ft/s = 0.3048 m/s
Mach 1 = 340.29 m/s (sea level, 15 degC)

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

All values convert through m/s as base unit:
1 mph = 0.44704 m/s
1 km/h = 1/3.6 m/s
1 knot = 0.514444 m/s
1 ft/s = 0.3048 m/s
Mach 1 = 340.29 m/s (sea level, 15 degC)

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: US Interstate Speed: 70 mph

Inputs

value: 70 from_unit: mph

Miles per Hour: 70 mph. Kilometers per Hour: 112.654 km/h. Meters per Second: 31.2928 m/s. Knots: 60.828 kn. Feet per Second: 102.667 ft/s. Mach Number: 0.092 Mach

With Speed Value = 70 and From Unit = mph as the stated inputs, the result is Miles per Hour = 70 mph, Kilometers per Hour = 112.654 km/h and Meters per Second = 31.2928 m/s. Each value corresponds to the declared output fields.

Example 2: Commercial Airliner: 560 knots

Inputs

value: 560 from_unit: knots

Miles per Hour: 644.436 mph. Kilometers per Hour: 1,037.119 km/h. Meters per Second: 288.0886 m/s. Knots: 560 kn. Feet per Second: 945.173 ft/s. Mach Number: 0.8466 Mach

With Speed Value = 560 and From Unit = knots as the stated inputs, the result is Miles per Hour = 644.436 mph, Kilometers per Hour = 1,037.119 km/h and Meters per Second = 288.0886 m/s. Each value corresponds to the declared output fields.

Example 3: Hurricane: Category 3 Wind Speed

Inputs

value: 130 from_unit: mph

Miles per Hour: 130 mph. Kilometers per Hour: 209.215 km/h. Meters per Second: 58.1152 m/s. Knots: 112.967 kn. Feet per Second: 190.667 ft/s. Mach Number: 0.1708 Mach

With Speed Value = 130 and From Unit = mph as the stated inputs, the result is Miles per Hour = 130 mph, Kilometers per Hour = 209.215 km/h and Meters per Second = 58.1152 m/s. Each value corresponds to the declared output fields.

Example 4: Fastball Pitch: 95 mph

Inputs

value: 95 from_unit: mph

Miles per Hour: 95 mph. Kilometers per Hour: 152.888 km/h. Meters per Second: 42.4688 m/s. Knots: 82.553 kn. Feet per Second: 139.333 ft/s. Mach Number: 0.1248 Mach

With Speed Value = 95 and From Unit = mph as the stated inputs, the result is Miles per Hour = 95 mph, Kilometers per Hour = 152.888 km/h and Meters per Second = 42.4688 m/s. Each value corresponds to the declared output fields.

Common Use Cases

Convert driving speed from mph to km/h at US-Canada border
Convert airplane speed from knots to mph
Convert running pace from mph to m/s