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Convert feet, inches, square footage, and gallons for your home projects.
Length & Distance
Imperial → Metric
Inches → Centimeters
1 inch = 2.54 cm
Feet → Meters
1 foot = 0.3048 m
Feet & Inches → Centimeters
(ft × 30.48) + (in × 2.54) = cm
Yards → Meters
1 yard = 0.9144 m
Miles → Kilometers
1 mile = 1.609344 km
Metric → Imperial
Millimeters → Inches
1 mm = 0.03937 in
Centimeters → Inches
1 cm = 0.3937 in
Meters → Feet
1 m = 3.28084 ft
Meters → Yards
1 m = 1.09361 yd
Kilometers → Miles
1 km = 0.621371 mi
Centimeters → Feet
1 cm = 0.0328084 ft
Millimeters → Feet
1 mm = 0.00328084 ft
Area
Imperial → Metric
Square Inches → Square Centimeters
1 in² = 6.4516 cm²
Square Feet → Square Meters
1 ft² = 0.092903 m²
Square Yards → Square Meters
1 yd² = 0.836127 m²
Acres → Hectares
1 acre = 0.404686 ha
Square Miles → Square Kilometers
1 mi² = 2.58999 km²
Metric → Imperial
Square Centimeters → Square Inches
1 cm² = 0.155 in²
Square Meters → Square Feet
1 m² = 10.7639 ft²
Square Meters → Square Yards
1 m² = 1.19599 yd²
Hectares → Acres
1 ha = 2.47105 acres
Square Kilometers → Square Miles
1 km² = 0.386102 mi²
Angle
Imperial → Metric
Degrees → Radians
1° = π/180 rad ≈ 0.0174533 rad
Degrees → Gradians
1° = 1.11111 gon
Metric → Imperial
Radians → Degrees
1 rad = 180/π ≈ 57.29578°
Gradians → Degrees
1 gon = 0.9°
Radians → Gradians
1 rad = 63.662 gon
Gradians → Radians
1 gon = 0.015708 rad
Energy
Imperial → Metric
Calories → Joules
1 cal = 4.184 J
Kilocalories → Kilojoules
1 kcal = 4.184 kJ
BTU → Joules
1 BTU = 1055.06 J
Metric → Imperial
Joules → Calories
1 J = 0.239006 cal
Kilojoules → Kilocalories
1 kJ = 0.239006 kcal
Joules → BTU
1 J = 0.000947817 BTU
Kilowatt-hours → Joules
1 kWh = 3,600,000 J
Joules → Kilowatt-hours
1 J = 0.00000027778 kWh
Force
Imperial → Metric
Pound-force → Newtons
1 lbf = 4.44822 N
Pound-force → Kilonewtons
1 lbf = 0.00444822 kN
Metric → Imperial
Newtons → Pound-force
1 N = 0.224809 lbf
Kilonewtons → Pound-force
1 kN = 224.809 lbf
Newtons → Kilonewtons
1 kN = 1000 N
Kilonewtons → Newtons
1 kN = 1000 N
Density
Imperial → Metric
Pounds per Cubic Foot → Kilograms per Cubic Meter
1 lb/ft³ = 16.0185 kg/m³
Pounds per Cubic Inch → Grams per Cubic Centimeter
1 lb/in³ = 27.6799 g/cm³
Metric → Imperial
Kilograms per Cubic Meter → Grams per Cubic Centimeter
1 kg/m³ = 0.001 g/cm³
Grams per Cubic Centimeter → Kilograms per Cubic Meter
1 g/cm³ = 1000 kg/m³
Kilograms per Cubic Meter → Pounds per Cubic Foot
1 kg/m³ = 0.062428 lb/ft³
Grams per Cubic Centimeter → Pounds per Cubic Inch
1 g/cm³ = 0.0361273 lb/in³