Length converter
For length: convert one dimension between selected linear units.
28 tools
Unit converters
Unit converters translate a value from one unit into another: metres into feet, Celsius into Fahrenheit, gigabytes into gibibytes. In unit converters, choose the source and target units to set the direction. Other tools have their own modes: writing a number in words, for example, has no reverse conversion.
All in section
All calculators Unit converters
Angle converter
Convert angles between degrees, radians, gradians and turns.
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Unit converters
Area converter
Convert area between metric and imperial units.
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Unit converters
Cooking volume converter
Convert cups, spoons and millilitres — metric and US measures differ.
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Unit converters
Cooking weight converter
Cups, spoons and millilitres into grams — and back — for a chosen product.
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Unit converters
Data rate converter
Convert data rate between Mbit/s and MB/s — bits are not bytes.
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Unit converters
Density converter
Convert density between kg/m³, g/cm³ and pounds per cubic foot.
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Unit converters
Digital storage converter
Convert bytes between decimal and binary units.
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Unit converters
Energy converter
Convert energy between joules, kilowatt-hours, calories and BTU.
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Unit converters
Flow rate converter
Convert volumetric flow between m³/h, litres per minute and CFM.
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Unit converters
Force converter
Convert force between newtons, kilogram-force and pound-force.
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Unit converters
Frequency converter
Convert frequency between hertz, kilohertz, megahertz and rpm.
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Unit converters
Fuel economy converter
Convert fuel economy between L/100 km, km/L and miles per gallon.
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Unit converters
Illuminance converter
Convert illuminance between lux, foot-candles and phots.
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Unit converters
Length converter
Convert between metric and imperial length units.
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Unit converters
Mass converter
Convert mass between metric and imperial units.
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Unit converters
Power converter
Convert power between watts, kilowatts and both kinds of horsepower.
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Unit converters
Pressure converter
Convert pressure between pascals, bars, atmospheres and psi.
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Unit converters
Radiation dose converter
Sieverts, millisieverts, microsieverts and rem, converted both ways.
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Unit converters
Speed converter
Convert speed between km/h, m/s, mph and knots.
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Unit converters
Temperature converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine.
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Unit converters
Time converter
Convert time between milliseconds, seconds, minutes, hours, days and weeks.
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Unit converters
Torque converter
Convert torque between N·m, kgf·m and pound-force feet.
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Unit converters
Volume converter
Convert volume between litres, cubic metres and gallons.
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Unit converters
Coordinate converter — DMS and decimal degrees
Convert coordinates between degrees-minutes-seconds and decimal degrees.
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Unit converters
Lakh and crore converter
Convert between lakh, crore and the familiar thousands and millions.
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Unit converters
Number to words converter
Write a whole number in words; the separate amount line is fixed to RUB and00 kopecks.
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Unit converters
Paper weight and sheets calculator
Ream mass from sheet size, grammage and sheet count.
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Unit converters
Model scale calculator
Convert sizes between the original and the model at a 1:N scale.
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Which calculation to choose
Area converter
For area: use square units rather than the length conversion factor.
What to prepare
Choose source and destination units first. Check whether the number represents length, area or volume.
Common mistake
When converting metres to centimetres, square the factor for area and cube it for volume.
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FAQ
Do converters work both ways?
Unit converters with source and target selectors can be reversed. Other tools have their own modes: number-to-words produces words from a number and does not parse those words back into a number.
What is the difference between a gigabyte and a gibibyte?
A gigabyte is 1,000,000,000 bytes and a gibibyte is 1,073,741,824. The gap is about 7% and it shows up on drive capacities.
Why are US and UK gallons different?
They are different volume units: a US liquid gallon is exactly 3.785411784 L and an imperial gallon exactly 4.54609 L. Choose the convention used for the original volume.
How accurate are the conversions?
Some factors follow exact definitions, such as 1 inch = 2.54 cm. Numerical arithmetic and display still have finite precision; an exact definition does not promise arbitrarily many correct decimal digits. Check the unit convention and the tool’s limits.
Categories
Finance
Loan, mortgage, compound interest, percentage and discount calculators for everyday money decisions.
Currency
Currency converter and popular pairs for quick travel, shopping and budget estimates.
Fitness
BMI, calories, running pace and one-rep max calculators for training and body metrics.
Home improvement
Tile, wallpaper, paint and laminate calculators for estimating materials before a project.
Date and time
Age and business day calculators for dates, planning and deadlines.
Maths calculators
Remainder, prime factors, proportions, equations and logarithms.
Business and marketing
Contribution margin, customer acquisition cost, average order value, returns and ad ROI.
Electronics calculators
Current, voltage, resistance, power and circuit supply.
Computer calculators
Download speed, bandwidth, frames, resolution and disk space.
Study calculators
Test percentages, the grade you need and reading speed.
Car calculators
Fuel consumption, power to weight, trip cost and speed.
Household calculators
Electricity use, tips and filling a pool.
Geometry calculators
Area, perimeter, volume and surface of flat and solid shapes.
Physics calculators
Force, energy, work, power and motion with stated units and models.
Chemistry calculators
Concentration, moles, dilution, pH and the ideal gas law.