CalcPairsEvery pair of units, converted exactly
One page per pair — both directions, the full table, and the exact constant the conversion stands on. 32 converters for length, weight, cooking, temperature and more. No sign-up, and everything runs in your browser.
Convert anything — the master converter
Most used
cm to Inches
Centimetres to inches and back, with the full 1–100 table.
📐Meters to Feet
Metres to feet and back — room sizes, heights, rope lengths.
🛣️km to Miles
Kilometres to miles and back, for road trips and races.
🔩mm to Inches
Millimetres to inches and back — bolts, drills, camera gear.
🧍Height Converter
Centimetres ↔ feet and inches, the way heights are actually said.
⚖️kg to lbs
Kilograms to pounds and pounds back to kilograms — both intents, one page.
🌡️°C to °F
Celsius to Fahrenheit and back — weather, cooking, body temperature.
⛽Liters to Gallons
Litres to gallons and back — with the US/UK gallon switch.
🥛ml to fl oz
Millilitres to US fluid ounces and back — bottles, doses, recipes.
☕Cups to ml
US cups to millilitres and back — the recipe converter.
⚖️Cups to Grams
Cups to grams with real ingredient densities — flour is not sugar.
🔥Oven Temperature
Oven temperatures in °C, °F and Gas Mark — the full chart plus converter.
🔲sq ft to sq m
Square feet to square metres and back — rooms and apartments.
🚗mph to km/h
Miles per hour to kilometres per hour and back — speed limits decoded.
🐎hp to kW
Horsepower to kilowatts and back — cars, motors, pumps.
Length
cm to Inches
Centimetres to inches and back, with the full 1–100 table.
📐Meters to Feet
Metres to feet and back — room sizes, heights, rope lengths.
🛣️km to Miles
Kilometres to miles and back, for road trips and races.
🔩mm to Inches
Millimetres to inches and back — bolts, drills, camera gear.
🧍Height Converter
Centimetres ↔ feet and inches, the way heights are actually said.
🏈Yards to Meters
Yards to metres and back — fabric, gardens, football fields.
📏cm to Feet
Centimetres straight to feet — for when inches are not wanted.
Weight
kg to lbs
Kilograms to pounds and pounds back to kilograms — both intents, one page.
🧂Grams to Ounces
Grams to ounces and back — recipes, parcels, coffee, jewellery.
🪨Stone Converter
Stone to pounds and stone to kilograms — UK body weight, decoded.
🚛Tonnes to lbs
Metric tonnes to pounds and back — freight, vehicles, bulk loads.
Temperature
Volume & Cooking
Liters to Gallons
Litres to gallons and back — with the US/UK gallon switch.
🥛ml to fl oz
Millilitres to US fluid ounces and back — bottles, doses, recipes.
☕Cups to ml
US cups to millilitres and back — the recipe converter.
⚖️Cups to Grams
Cups to grams with real ingredient densities — flour is not sugar.
🥄Tbsp to ml
Tablespoons to millilitres and back — and the teaspoon chain.
🍯Tsp to Grams
Teaspoons to grams, density-aware — salt, sugar, honey and more.
🫙Liters to Quarts
Litres to US quarts and back — pots, coolers, engine oil.
🔥Oven Temperature
Oven temperatures in °C, °F and Gas Mark — the full chart plus converter.
Area
Speed
Pressure
Energy, Power & Force
Calories to kJ
Food Calories (kcal) to kilojoules and back — for the other label column.
🔋kWh to MJ
Kilowatt-hours to megajoules and back — electricity bills meet physics.
🐎hp to kW
Horsepower to kilowatts and back — cars, motors, pumps.
💪Newtons to lbf
Newtons to pounds-force and back — torque, thrust and climbing gear.
Why one page per pair?
A search engine's built-in widget will give you one number and no working. A pair page gives you the conversion in both directions at once, the table for the next hundred values you might need, the cooking densities and gallon variants the widget quietly skips, and the exact constant — so you can check the number instead of trusting it. That is the whole design of this site.