Unit converter
Exact unit conversions, UK and US. Exact defined values, no rounding surprises.
1 kilogram = 2.204622622 pounds
Calculators and tools
From the blog
EV charging
How to estimate EV charging time
Work out the energy your battery needs, understand charger and car limits, and turn a charging-time estimate into a practical plan.
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Building materials
Planning building material quantities without double-counting waste
Turn measured dimensions into material quantities, allow for waste once, and combine your calculator results into a project shopping list.
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DIY projects
How much paint do you need for a room?
Measure your walls, subtract openings, choose coats and coverage, then estimate litres and tin sizes before starting your DIY painting project.
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EV home charging cost UK: a worked 7 kW example
A real worked example of what a 20–80% EV top-up costs on an off-peak tariff, a standard tariff and a public rapid charger in the UK.
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EV real-world range: miles per kWh explained
Work out an electric car’s real-world range from battery size and miles per kWh, with summer, winter and motorway examples.
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How many bricks per m²? Garden wall worked example
Why a single-skin wall uses about 60 standard UK bricks per m², with a worked garden-wall example including wastage and rounding.
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How much concrete for a shed base? m³ and bags
Work out the concrete volume for a typical shed base in m³, add a sensible allowance and turn it into bags or a ready-mix order.
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How many tiles do I need? A bathroom wall example
Measure a bathroom wall, subtract the window, add wastage and round to whole tiles and packs with this real worked tiling example.
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How much decking do I need? A 3.6 m × 4 m example
Count decking boards and joists for a real 3.6 m × 4 m garden deck, including board gaps, joist spacing and a wastage allowance.
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Popular conversions
- kg → lbkilograms to pounds
- cm → incentimetres to inches
- mi → kmmiles to kilometres
- °C → °Fdegrees Celsius to degrees Fahrenheit
- st → kgstone to kilograms
- UK gal → LUK gallons to litres
- lb → kgpounds to kilograms
- ft → mfeet to metres
- °F → °Cdegrees Fahrenheit to degrees Celsius
- in → cminches to centimetres
- mph → km/hmiles per hour to kilometres per hour
- mpg (UK) → L/100 kmUK miles per gallon to litres per 100 km
- cm → ft+incentimetres to feet & inches
- kg → st+lbkilograms to stone & pounds
All categories
- LengthDistances from nanometres to nautical miles, in metric and imperial units.
- Weight & MassKilograms, pounds, stone, ounces, tonnes and more.
- VolumeLitres, UK and US gallons, pints, fluid ounces and kitchen measures.
- AreaSquare metres, square feet, acres, hectares and more.
- TemperatureCelsius, Fahrenheit, Kelvin and Rankine with exact offset formulas.
- SpeedMiles per hour, kilometres per hour, knots and more.
- TimeSeconds through to years, using the average Gregorian year.
- Data StorageBits and bytes in decimal (MB, GB) and binary (MiB, GiB) prefixes.
- PressureBar, psi, pascals, atmospheres and mercury columns.
- EnergyJoules, calories, kilowatt-hours, BTU and more.
- PowerWatts, kilowatts, horsepower and BTU per hour.
- AngleDegrees, radians, gradians, arcminutes and turns.
- Fuel ConsumptionUK mpg, US mpg, litres per 100 km and kilometres per litre.