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Unit Conversion Tables

Speed

Convert from To Equation
Meters Per Second (mps) Miles Per Hour (mph) mps x 2.24
Miles Per Hour (mph) Meters Per Second (mps) mph x 0.447
Knots Miles Per Hour (mph) knots x 1.15
Meters Per Second (mps) Kilometers Per Hour mps x 3.6

Length

Convert from To Equation
Inches Centimeters inches x 25.4
Centimeters Inches centimeters / 25.4
Meters Feet meters x 3.28
Feet Meters feet x 0.305
Kilometers Miles Kilometers x 0.621
Miles Kilometers Miles x 1.609

Area

Convert from To Equation
Square Meters Square Feet sq. meters x 10.76
Square Feet Square Meters sq. feet x 0.093

Power

Convert from To Equation
Kilowatts Watts Kilowatts x 1000
Watts Kilowatts Watts x 0.001
Megawatts Kilowatts Megawatts x 1000
Kilowatts Megawatts Kilowatts x 0.001
Watts Btu/hour Watts x 3.413
Btu / hour Watts Btu / hour x 0.293
Kilowatts Btu / hour Kilowatts x 3414
Btu / hour Kilowatts Btu / hour x 0.000293
Watts Horsepower Watts x 0.00134
Horsepower Watts Horsepower x 746
Kilowatts Horsepower Kilowatts x 1.34
Horsepower Kilowatts Horsepower x 0.746

Energy

Convert from To Equation
Watt-hours Kilowatt-hours Watt-hours x 0.001
Kilowatt-hours Megawatt-hours Kilowatt-hours x 0.001
Watt-hours Btu Watt-hours x 3.414
Btu Watt-hours Btu x 0.293
Kilowatt-hours Btu Kilowatt-hours x 3,414
Btu Kilowatt-hours Btu x 0.000293
Watt-hours Horsepower-hours Watt-hours x 0.00134
Horsepower-hours Watt-hours Horsepower-hours x 746
Kilowatt-hours Horsepower-hours Kilowatt-hours x 1.34
Horsepower-hours Kilowatt-hours Horsepower-hours x 0.746

Tires Gear RPM MPH KPH

MPH = RPM * WHEEL DIAMETER) / (GEAR RATIO * 336)

RPM = (MPH * GEAR RATIO * 336) / WHEEL DIAMETER

WHEEL DIAMETER = (MPH * GEAR RATIO * 336) / RPM

GEAR RATIO = (RPM * WHEEL DIAMETER) / (MPH * 336)

KPH = MPH * 160.93

MPH = KPH / 0.6214

Changing wheel diameter

ACTUAL SPEED = (NEW TIRE DIAMETER * INDICATED SPEED) / OLD TIRE DIAMETER)

Example: You changed from 24 inch tires to 27 inch tires. What is the actual speed when the speedometer indicates 30 MPH

(27 * 30) / 24 = 33.75 MPH

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