{"chart":"conversion-formulas-chart","generatedFrom":"All Unit Conversions shared conversion library","tables":[{"title":"Length formulas","headers":["Conversion","Formula","Reverse","Example","Factor"],"rows":[["Inches to centimetres","cm = in × 2.54","in = cm ÷ 2.54","12 in = 30.48 cm","Exact as shown"],["Inches to millimetres","mm = in × 25.4","in = mm ÷ 25.4","0.5 in = 12.7 mm","Exact as shown"],["Feet to metres","m = ft × 0.3048","ft = m ÷ 0.3048","10 ft = 3.048 m","Exact as shown"],["Yards to metres","m = yd × 0.9144","yd = m ÷ 0.9144","100 yd = 91.44 m","Exact as shown"],["Miles to kilometres","km = mi × 1.609344","mi = km ÷ 1.609344","26.2 mi = 42.165 km","Exact as shown"],["Nautical miles to kilometres","km = nmi × 1.852","nmi = km ÷ 1.852","100 nmi = 185.2 km","Exact as shown"]]},{"title":"Area and volume formulas","headers":["Conversion","Formula","Reverse","Example","Factor"],"rows":[["Square feet to square metres","m² = ft² × 0.09290304","ft² = m² ÷ 0.09290304","500 ft² = 46.452 m²","Exact as shown"],["Acres to hectares","ha = ac × 0.4046856","ac = ha ÷ 0.4046856","40 ac = 16.187 ha","Rounded"],["Acres to square feet","ft² = ac × 43,560","ac = ft² ÷ 43,560","0.25 ac = 10,890 ft²","Exact as shown"],["US gallons to litres","L = US gal × 3.785412","US gal = L ÷ 3.785412","5 US gal = 18.927 L","Rounded"],["UK gallons to litres","L = UK gal × 4.54609","UK gal = L ÷ 4.54609","5 UK gal = 22.73 L","Rounded"],["US fluid ounces to millilitres","mL = US fl oz × 29.57353","US fl oz = mL ÷ 29.57353","8 US fl oz = 236.588 mL","Rounded"],["US cups to millilitres","mL = cup × 236.5882","cup = mL ÷ 236.5882","2 cup = 473.176 mL","Rounded"],["Cubic feet to litres","L = ft³ × 28.31685","ft³ = L ÷ 28.31685","10 ft³ = 283.168 L","Rounded"]]},{"title":"Weight and mass formulas","headers":["Conversion","Formula","Reverse","Example","Factor"],"rows":[["Ounces to grams","g = oz × 28.34952","oz = g ÷ 28.34952","8 oz = 226.796 g","Rounded"],["Pounds to kilograms","kg = lb × 0.4535924","lb = kg ÷ 0.4535924","150 lb = 68.039 kg","Rounded"],["Stones to kilograms","kg = st × 6.350293","st = kg ÷ 6.350293","11 st = 69.853 kg","Rounded"],["Pounds to ounces","oz = lb × 16","lb = oz ÷ 16","2.5 lb = 40 oz","Exact as shown"]]},{"title":"Speed, pressure, energy and power formulas","headers":["Conversion","Formula","Reverse","Example","Factor"],"rows":[["Miles per hour to km/h","km/h = mph × 1.609344","mph = km/h ÷ 1.609344","70 mph = 112.654 km/h","Rounded"],["Knots to km/h","km/h = kn × 1.852","kn = km/h ÷ 1.852","120 kn = 222.24 km/h","Exact as shown"],["Metres per second to km/h","km/h = m/s × 3.6","m/s = km/h ÷ 3.6","10 m/s = 36 km/h","Rounded"],["psi to kilopascals","kPa = psi × 6.894757","psi = kPa ÷ 6.894757","32 psi = 220.632 kPa","Rounded"],["Bar to psi","psi = bar × 14.50377","bar = psi ÷ 14.50377","2.2 bar = 31.908 psi","Rounded"],["Kilowatt-hours to megajoules","MJ = kWh × 3.6","kWh = MJ ÷ 3.6","10 kWh = 36 MJ","Exact as shown"],["Kilocalories to kilojoules","kJ = kcal × 4.184","kcal = kJ ÷ 4.184","250 kcal = 1,046 kJ","Exact as shown"],["BTU to kilojoules","kJ = BTU × 1.055056","BTU = kJ ÷ 1.055056","1000 BTU = 1,055.056 kJ","Rounded"],["Horsepower to kilowatts","kW = hp × 0.7456999","hp = kW ÷ 0.7456999","150 hp = 111.855 kW","Rounded"]]},{"title":"Temperature formulas","headers":["Conversion","Formula","Reverse","Example"],"rows":[["Celsius to Fahrenheit","°F = °C × 9/5 + 32","°C = (°F − 32) × 5/9","25 °C = 77 °F"],["Celsius to kelvin","K = °C + 273.15","°C = K − 273.15","25 °C = 298.15 K"],["Fahrenheit to kelvin","K = (°F − 32) × 5/9 + 273.15","°F = (K − 273.15) × 9/5 + 32","98.6 °F = 310.15 K"],["Fahrenheit to Rankine","°R = °F + 459.67","°F = °R − 459.67","70 °F = 529.67 °R"],["Temperature difference","Δ°F = Δ°C × 1.8 (no offset)","Δ°C = Δ°F ÷ 1.8","A 10 °C rise = an 18 °F rise"]]},{"title":"Useful relationships","headers":["Quantity","Formula","Units"],"rows":[["Speed","speed = distance ÷ time","km/h = km ÷ h;  m/s = km/h ÷ 3.6"],["Density","density = mass ÷ volume","1 g/cm³ = 1000 kg/m³ = 62.43 lb/ft³"],["Pressure","pressure = force ÷ area","1 Pa = 1 N/m²;  1 psi = 1 lbf/in²"],["Power","power = energy ÷ time","1 W = 1 J/s;  1 kWh = 3.6 MJ"],["Area of a circle","A = π × r²","Use the same unit for r and A (m → m²)"],["Volume of a cylinder","V = π × r² × h","1 m³ = 1000 L;  1 ft³ = 28.32 L"]]}]}