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Live results as you type

Convert anything. exactly.

Unit converters and calculators with exact factors and the formula on every page. Free, fast, in 20 languages.

Example
5 ft = 152.4 cmcm

5 ft = 152.4 cmexactOpen the ft to cm converter

PopularCentimetres to InchesKilograms to PoundsDegrees Celsius to Degrees FahrenheitLoan calculatorKilometres to Miles

Exact factorsFormulas shownNo sign-up20 languages

Length1 in= 2.54 cmWeight & mass1 lb= 0.45359237 kgTemperature100 °C= 212 °FLength1 mi= 1.609344 kmVolume1 gal (US)= 3.785411784 LArea1 ac= 0.40468564224 haSpeed1 mph= 1.609344 km/hDigital data1 GiB= 1.073741824 GBScience & engineering1 kcal= 4.184 kJScience & engineering1 bar≈ 14.50377377 psiLength1 ft= 0.3048 mWeight & mass1 oz= 28.349523125 gLength1 nmi= 1.852 kmTime units1 wk= 168 h

The workbench

Currency

Today’s reference rates for major currencies, with the date and source beside every figure.

EURUSD

Frankfurt → New York

Open the converter

Rates are never guessed: the converter shows the published rate and its date.

Length

cm

30 cm = 11.81 in

1 in = 2.54 cm exactly

Temperature

°C

21 °C = 69.8 °F

°F = °C × 1.8 + 32

Percent of

%
of

15% of 240 = 36

240 × 0.15 = 36

Weight & mass

kg

70 kg = 154.32 lb

1 kg = 2.204622622 lb

Tip & split

Bill
3

33.12 each for 3 people

Total 99.36, including 12.96 tip

Data size

MB

2500 MB = 2.5 GB

1 GB = 1,000 MB exactly

Age

—

Monthly loan payment

Example loan · €250,000 · 4.2% · 25 years

€1,347.36

a month · €154,207 interest in total

Recently used

Tools you open will appear here, on this device only.

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All tools
33

Length

Length converter

37

Weight & mass

Weight and mass converter

13

Temperature

Temperature converter

41

Volume

Volume converter

31

Area

Area converter

27

Speed

Speed converter

90

Currency

Currency converter · EUR to USD · USD to EUR

5

Percentages

Percentage calculator · Percentage increase calculator · Percentage difference calculator

21

Finance

Loan calculator · Mortgage calculator · Compound interest calculator

21

Maths

Scientific calculator · Fraction calculator · Decimal to fraction calculator

9

Date & time

Age calculator · Days between dates · Add or subtract days

36

Time units

Time converter

66

Digital data

Data storage converter · Data rate converter · Download time calculator

8

Health & fitness

BMI calculator · Calorie calculator · BMR calculator

8

Geometry

Circle calculator · Triangle calculator · Pythagorean theorem calculator

39

Cooking

Cooking measurement converter

327

Science & engineering

Pressure converter · Energy converter · Power converter

26

Screens & design

Pixel and point converter · Aspect ratio calculator · Screen PPI calculator

7

Everyday

Discount calculator · Tip calculator · Unit price calculator

The atlas of tools

Every tool is a star. Hover to read it, click to open.

Prefer words?

How we keep it exact

2.54

Exact factors

Every factor is stored as an exact fraction, so 1 inch is 2.54 cm, not 2.5399999.

≈ · =

Rounding marked

When a result had to be rounded, we show ≈ instead of =.

y = x · k

Formulas shown

Each page shows the formula and a worked example, so you can check us.