Conversion Factors

Unit conversion reference for length, area, volume, mass, pressure, energy, concentration, radiation, and more — with a live Quick Converter below.

⚡ Quick Converter

→
—
Searching all categories
From Multiply By To Find Notes
1 inch 2.54 centimeters (cm)
1 inch 25.4 millimeters (mm)
1 foot 12 inches
1 foot 0.3048 meters (m)
1 yard 3 feet
1 yard 0.914 meters (m)
1 mile 5280 feet
1 mile 1609 meters
1 mile 1.609 kilometers (km)
1 meter 3.281 feet
From Multiply By To Find Notes
1 sq in 6.452 sq centimeters
1 sq in 645.2 sq millimeters
1 sq ft 144 sq inches
1 sq ft 0.0929 sq meters
1 sq yard 9 sq feet
1 acre 0.405 hectares
From Multiply By To Find Notes
1 cu cm 1 mL
1 cu in 16.39 cu cm
1 cu ft 1728 cu inches
1 cu ft 0.02832 cu meters
1 liter 1.057 quarts (US)
1 US gallon 3.785 liters
1 US gallon 0.1337 cu ft
1 fluid oz 29.57 mL
From Multiply By To Find Notes
1 ounce 28.35 grams
1 pound (lb) 16 ounces
1 pound (lb) 0.454 kilograms (kg)
1 kg 2.205 pounds (lb)
1 US ton 2000 pounds
1 metric tonne 1000 kg
1 gram (g) 1000 milligrams (mg)
From Multiply By To Find Notes
°F to °C (°F − 32) × 5/9 Celsius (°C)
°C to °F (°C × 9/5) + 32 Fahrenheit (°F)
°C to K °C + 273 Kelvin (K) Absolute scale
°F to R °F + 460 Rankine (R) Absolute scale
From Multiply By To Find Notes
1 psia 6.895 kN/m² (kPa)
1 psia 0.0680 atmospheres (atm)
1 psia 27.67 inches H₂O
1 psia 51.72 mm Hg (Torr)
1 atm 14.70 psia
1 atm 101.3 kN/m² (kPa)
1 atm 760 mm Hg
1 mm Hg (Torr) 0.01934 psia
1 in H₂O 0.0361 psia
1 bar 0.9869 atm
1 bar 14.504 psia
From Multiply By To Find Notes
1 calorie 4.187 Joules (J)
1 calorie 0.003968 BTU
1 BTU 1055 Joules (J)
1 BTU 252 calories
1 kWh 3,600,000 Joules 3.6 × 10⁶ J
1 Watt 1 J/s
From Multiply By To Find Notes
1 ft/s 0.3048 m/s
1 ft/s 0.6818 mph
1 m/s 3.281 ft/s
1 m/s 2.237 mph
1 mph 0.4470 m/s
1 mph 1.467 ft/s
From Multiply By To Find Notes
1 ppm 1 mg/L In water/liquids
1 mg/L 1 ppm In water/liquids
ppm → mg/m³ ppm × MW ÷ 24.45 mg/m³ At NTP (25°C, 1 atm)
mg/m³ → ppm mg/m³ × 24.45 ÷ MW ppm At NTP
From Multiply By To Find Notes
1 rad 0.01 Gray (Gy) Absorbed dose
1 rem 0.01 Sievert (Sv) Dose equivalent
1 Curie (Ci) 3.7 × 10¹⁰ Becquerel (Bq) Activity
1 Becquerel 1 disintegration/second
From Multiply By To Find Notes
1 foot-candle 10.76 lux (lx)
1 foot-lambert 3.426 candela/m²
From Multiply By To Find Notes
1 Tesla 10,000 Gauss

Source: Yates Safety Professional's Reference and Study Guide, 4th Ed., Appendix B