📏 Calculator Tools

Unit Converter

Convert length, weight, temperature, volume, area, speed, time, data and cooking measurements instantly — accurate and private.

0.393701

1 cm = 0.393701 in1 cm = 0.393701 in

Millimetre10 mm
Metre0.01 m
Kilometre0.00001 km
Inch0.393701 in
Foot0.0328084 ft
Yard0.0109361 yd
Mile0.00000621371 mi
Nautical mile0.00000539957 nmi
About this tool

Every everyday conversion in one fast, private tool

The Unit Converter handles the measurements people look up most: length (cm to inches, metres to feet, miles to kilometres), weight (kg to pounds, grams to ounces, stones), temperature (Celsius, Fahrenheit, Kelvin), volume, area, speed, time, digital storage, and cooking amounts. Pick a category, choose your two units, type a number, and the answer appears instantly — along with a full table showing that value in every other unit at once.

It runs entirely in your browser using exact conversion factors, so results are precise and nothing you type is ever uploaded. The cooking tab goes further than a simple volume converter: it uses real ingredient densities to convert cups, tablespoons and millilitres to grams and ounces for flour, sugar, butter and more — the exact problem that trips up bakers following recipes from another country.

100% freeNo sign-up9 categoriesWorks offline
How to use it
  1. 1Pick a category tab — Length, Weight, Temperature, Volume, Area, Speed, Time, Data or Cooking.
  2. 2Choose the unit you're converting from and the unit you want.
  3. 3Type your value; the converted result and a full reference table update instantly.
  4. 4Use the swap button to reverse the direction in one click.
What it converts
  • Length — mm, cm, m, km, inch, foot, yard, mile, nautical mile
  • Weight — mg, g, kg, tonne, ounce, pound, stone
  • Temperature — Celsius, Fahrenheit, Kelvin
  • Volume — ml, litre, tsp, tbsp, fl oz, cup, pint, quart, gallon
  • Area, Speed, Time and Digital storage
  • Cooking — cups/tbsp/ml ↔ grams/ounces by ingredient

Frequently asked questions

How do I convert cm to inches (and back)?
Divide centimetres by 2.54 to get inches, or multiply inches by 2.54 to get centimetres. On the Length tab, choose cm and inch and the tool does it instantly, both ways with the swap button.
How do I convert kg to pounds?
Multiply kilograms by 2.2046 to get pounds (1 kg = 2.20462 lb). To go the other way, divide pounds by 2.2046. Select Weight, then kg and lb.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32 (°F = °C × 1.8 + 32). For example, 20°C = 68°F. The Temperature tab handles Celsius, Fahrenheit and Kelvin in any direction.
How many grams are in a cup?
It depends on the ingredient, because grams measure weight and cups measure volume. One US cup is about 125 g of flour, 200 g of granulated sugar, 227 g of butter and 236 g of water. The Cooking tab converts cups to grams using each ingredient's density.
Are digital storage units based on 1000 or 1024?
This tool uses 1024 (1 KB = 1024 bytes), which matches how most operating systems report file sizes. Note that storage manufacturers often use 1000, which is why a '1 TB' drive shows as roughly 931 GB in your OS.
Is it accurate and private?
Yes — it uses exact, standard conversion factors and runs entirely in your browser. Nothing is uploaded, and it keeps working offline once the page has loaded.
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Full guide

Metric vs Imperial: A Complete Unit Conversion Guide

The formulas behind cm↔inches, kg↔lb and °C↔°F, why cups-to-grams needs density, and how to avoid conversion mistakes.

Metric vs imperialCooking cups to gramsCommon conversion formulas

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