How do I convert micro, milli or nano to the base unit?

Choose Metric prefix, pick the prefix you have, and type the value: every other prefix is listed at once. 1 micro is 0.001 milli and 0.000001 of the base unit (shown as 1e-6); 1 nano is 0.001 micro. The prefixes mean the same for any unit, so this works for volts, amps, farads, seconds, grams or metres alike: 470 µF is 0.47 mF, and 2,500 mA is 2.5 A.

Why is temperature handled differently from the rest?

Because it has offsets, not just ratios - zero Celsius is not zero Fahrenheit. Multiplying by a conversion factor, which works for every other category here, gives the wrong answer for temperature, so it is converted properly.

Does the data category use 1000 or 1024?

Both, listed separately. Kilobytes, megabytes, gigabytes and terabytes (kB, MB, GB, TB) go up in thousands, as disk makers count; kibibytes, mebibytes, gibibytes and tebibytes (KiB, MiB, GiB, TiB) go up in 1024s, which is what Windows shows while calling them KB, MB and GB. That is why a 500 GB disk shows as about 465 GB on a PC.

Can it convert between number bases?

Yes. The base converter moves a value between binary, octal, decimal and hexadecimal, which is the other half of what people come here for.

Is it accurate enough for engineering work?

Results are shown to 10 significant figures, which is ample for everyday use; very large or very small results (16 or more digits before the decimal point, or below 0.0001) switch to exponent form with up to 7. For anything with a tolerance attached, verify against a reference.

Does it need an internet connection?

Only to load the page. After that the conversions are arithmetic in your browser and work offline.

Stays on your computer How this works

Free online unit converter: measurements, metric prefixes and number bases

Convert length, weight, temperature, volume, data sizes and more, metric prefixes like micro, milli and nano, and numbers between binary, decimal and hex — every unit at once, as you type

Units

Nanometre (nm)1000000000

Micrometre (µm)1000000

Millimetre (mm)1000

Centimetre (cm)100

Metre (m)1

Kilometre (km)0.001

Inch (in)39.37007874

Foot (ft)3.280839895

Yard (yd)1.093613298

Mile (mi)0.0006213711922

Nautical mile0.0005399568035

Number bases

Binary11111111

Octal377

Decimal255

Hexff

Everything runs locally in your browser.

About this unit converter

Converts between units of length, mass, temperature, area, volume, speed, time and data, between metric prefixes on their own (nano to micro, milli to the base unit, kilo to mega), and between number bases — binary, octal, decimal and hexadecimal — in the same place. Most online conversion sites show one pair of units at a time; this one lists every unit in the category at once, so one typed value answers every question about it.

Conversions update as you type, with no button to press. It is free to use, with no account and no upload limit, and it runs entirely in your browser: nothing is uploaded, and while the page stays open, a feature you have already used keeps working offline.

What you can do

Convert length: nanometres, micrometres, millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles
Convert mass: micrograms, milligrams, grams, kilograms, tonnes, ounces, pounds and stone
Convert temperature between Celsius, Fahrenheit and Kelvin
Convert data sizes in decimal kB, MB, GB and TB and binary KiB, MiB, GiB and TiB, plus bits and bytes
Convert area: square centimetres, square metres, hectares, square kilometres, square feet, acres and square miles
Convert speed between m/s, km/h, mph, knots and ft/s
Convert time from nanoseconds up to weeks
Convert metric prefixes for any unit, from pico and nano through micro, milli, centi and deci to kilo, mega, giga and tera
Convert volume: millilitres, litres, cubic metres and US teaspoons, tablespoons, cups, pints, gallons and fluid ounces
See the value in every unit of the category at once, as you type
Convert numbers between binary, octal, decimal and hex, with no size limit

How to convert a unit

Choose a category - length, mass, temperature, data, area, speed, time, volume or metric prefix.
Pick the unit you are converting from. Every other unit in the category is listed at once, so there is no second unit to choose.
Type the value. The result appears as you type, with no button to press.
For number bases, use the base converter to move between binary, octal, decimal and hexadecimal.

Questions

How do I convert micro, milli or nano to the base unit?: Choose Metric prefix, pick the prefix you have, and type the value: every other prefix is listed at once. 1 micro is 0.001 milli and 0.000001 of the base unit (shown as 1e-6); 1 nano is 0.001 micro. The prefixes mean the same for any unit, so this works for volts, amps, farads, seconds, grams or metres alike: 470 µF is 0.47 mF, and 2,500 mA is 2.5 A.
Why is temperature handled differently from the rest?: Because it has offsets, not just ratios - zero Celsius is not zero Fahrenheit. Multiplying by a conversion factor, which works for every other category here, gives the wrong answer for temperature, so it is converted properly.
Does the data category use 1000 or 1024?: Both, listed separately. Kilobytes, megabytes, gigabytes and terabytes (kB, MB, GB, TB) go up in thousands, as disk makers count; kibibytes, mebibytes, gibibytes and tebibytes (KiB, MiB, GiB, TiB) go up in 1024s, which is what Windows shows while calling them KB, MB and GB. That is why a 500 GB disk shows as about 465 GB on a PC.
Can it convert between number bases?: Yes. The base converter moves a value between binary, octal, decimal and hexadecimal, which is the other half of what people come here for.
Is it accurate enough for engineering work?: Results are shown to 10 significant figures, which is ample for everyday use; very large or very small results (16 or more digits before the decimal point, or below 0.0001) switch to exponent form with up to 7. For anything with a tolerance attached, verify against a reference.
Does it need an internet connection?: Only to load the page. After that the conversions are arithmetic in your browser and work offline.