Everything,
in the right
units.
For the recipe, the room, the new idea.
Turn a number into something you can work with.
One input.
Every angle.
A metre is also a hundred centimetres. Try a value and see the whole family of units, together.
A little distance.
A different perspective.
From a screen specification to the width of a shelf. Move the ruler and see centimetres, inches and feet describe the same length.
An illustration of unit equivalents, not an on-screen measuring device. One inch is exactly 2.54 cm.
A place for
every conversion.
Everyday essentials, digital details and the measurements behind a project. Pick a category or search for a unit.
Length Converter
Metres, miles, inches and feet.
Mass Converter
Kilograms, pounds, ounces and more.
Temperature Converter
Celsius, Fahrenheit and Kelvin.
Area Converter
Square units, acres and hectares.
Volume Converter
Litres and clearly labelled liquid units.
Speed Converter
Kilometres per hour, mph and knots.
Time Converter
Seconds, minutes, hours and days.
Angle Converter
Degrees, radians, gradians and turns.
Pressure Converter
Pascals, bars, psi and atmospheres.
Energy Converter
Joules, watt-hours, calories and BTU.
Power Converter
Watts and two horsepower conventions.
Data Storage Converter
Bits, bytes and decimal/binary prefixes.
Fuel Economy Converter
Consumption and economy, clearly connected.
Frequency Converter
Hertz, prefixes and cycles per revolution.
Force Converter
Newtons and defined force units.
Density Converter
A supplied mass-per-volume measurement.
Acceleration Converter
Acceleration with standard gravity explicit.
Torque Converter
Newton-metres and force-based moment units.
Volume Flow Rate Converter
Liquid flow per second, minute or hour.
Angular Velocity Converter
Rotation in radians, degrees and revolutions.
Data Transfer Rate Converter
Connection rates in bits and bytes.
Electric Charge Converter
Coulombs, ampere-hours and milliampere-hours.
Voltage Converter
Volts, millivolts and metric prefixes.
Electric Current Converter
Amperes and their metric prefixes.
Electrical Resistance Converter
Ohms, kiloohms and megaohms.
Capacitance Converter
Farads, microfarads, nanofarads and picofarads.
Inductance Converter
Henries and the small prefixes that matter.
Magnetic Flux Density Converter
Teslas, milliteslas and gauss.
Magnetic Flux Converter
Webers and maxwells.
Illuminance Converter
Lux and light arriving at a surface.
Luminance Converter
Nits, candelas and foot-lamberts.
Amount of Substance Converter
Moles and their metric prefixes.
Molar Mass Converter
A substance’s supplied mass per mole.
Mass Concentration Converter
Mass per volume, without hidden PPM assumptions.
Specific Energy Converter
Energy per mass in clear compound units.
Specific Heat Capacity Converter
Heat capacity per mass and temperature interval.
Heat Transfer Coefficient Converter
Heat transfer coefficients with area explicit.
Thermal Conductivity Converter
Conductivity in metric and BTU-based units.
Dynamic Viscosity Converter
Pascal-seconds, poise and centipoise.
Kinematic Viscosity Converter
Square units per second, stokes and centistokes.
No converters found.
Try a unit such as metres, gallons, watts or bytes.
A small change.
A bigger picture.
Double a cube's side. Its surface scales by four, and its volume by eight. Move the slider and see why squared and cubed units matter.
Relative to the original cube. This is a geometric illustration.
Explore volume units ↗Find a new
point of view.
A full circle is 360 degrees, 2π radians or one turn. Rotate the compass to watch the same angle take three different forms.
Make the connection.
Different labels can describe exactly the same thing. Try these two everyday translations.
Lower consumption means higher miles per gallon. US and Imperial gallons give different numbers.
How long
would that take?
A connection speed is a rate. A file size is a quantity. Bring them together to estimate a theoretical transfer time.
Before protocol overhead, server limits and real-world conditions. No file is uploaded.
Nothing disappeared.
The units changed.
A 500 GB drive contains about 465.66 GiB. Compare decimal and binary labels for the same byte count, without confusing the units with usable disk space.
A rate becomes
a real quantity.
Watts describe a rate. Kilowatt-hours describe energy. Choose a constant power and a duration to see the relationship, with no electricity tariff assumed.
Illustrative constant consumption. Real devices can cycle on and off or change their power draw.
Explore energy unitsThe details
make the difference.
Three common unit mix-ups. Open a card to see the actual definition behind the label.
A gallon.
Which gallon?
+
Which gallon?
1 US liquid gallon = 3.785411784 L.
1 Imperial gallon = 4.54609 L.
A gigabyte.
Or a gibibyte?
+
Or a gibibyte?
1 GB = 1,000,000,000 bytes.
1 GiB = 1,073,741,824 bytes.
Power.
Or total energy?
+
Or total energy?
A watt is one joule per second.
1 kWh is 3,600,000 joules.
What is on
your mind?
Take the shortest route from a real question to a useful answer.
Will it fit?
Room dimensions, desk widths and the distance between a plan and a place.
Length converter ↗How fast is that?
Compare kilometres per hour, miles per hour and knots with the units clear.
Speed converter ↗What's the rating?
Watts, kilowatts and two horsepower conventions, ready for a specification.
Power converter ↗Behind the numbers.
Useful explanations for the conventions, definitions and small details behind a conversion.
Concentration, density and molarity: read the quantity first
Similar-looking compound units can describe different measurements. Here is what a fixed-factor converter can and cannot connect.
GB and GiB: why the same drive shows a different number
A drive advertises 500 GB and an application displays a number closer to 465.66. That difference can be a naming convention rather than lost data.
Celsius and Fahrenheit: a reading is different from a temperature change
Celsius, Fahrenheit and Kelvin use both scale factors and offsets. Knowing what your value means prevents a common mistake.
A few
good questions.
The practical details of using Unitly.
Is every converter free?+
Yes. All 40 converters in the current toolkit are available without payment or an account.
Does my input leave this browser?+
Conversion values are processed locally by JavaScript. Ordinary page and font requests still happen; our privacy policy explains the distinction.
How much precision is shown?+
Results display up to twelve significant digits. That describes the arithmetic, not the accuracy of your source measurement. Round appropriately for your task.
Can I reverse the conversion?+
Yes. Swap reverses source and destination and uses the unrounded result as the new input, preserving the same quantity.
What about engineering specifications?+
Confirm the unit convention and required precision against your specification. These converters are practical arithmetic tools, not certified engineering software.