Welcome to Calculators.net!

Home of free online calculators — Calculators.net's mission statement is to be the world's largest and most comprehensive collection of online calculators on the Web.

Calculators.net provide a seemingly endless array of handy and useful calculators along with plenty of conversion tools, organized by a large variety of categories, from math & science to finance, health & everyday cooking — and it's always FREE!

Length

Our length converter tool enables quick and accurate conversions between many units of length measurements.

Kilometer to Mile, Mile to Kilometer, more »

Area

This area converter tool can help you quickly switch between any units of area such as acres and square feet.

Dunam to Acre, Acre to Dunam, more »

Weight

The useful weight converter tool is here to assist with any conversions between different weight units, such as pounds and kilograms.

Kilogram to pound, Pound to Kilogram, more »

Time

How many minutes are in a day? If this kept you up at night you arrived to the right place — our time units conversion tool is here to help!

Second to Millisecond, Hour to Minute, more »

Volume

How many pints are in a gallon? Our volume conversion tool makes converting between 12 different volume variants a snap.

Pint to Quart, Liter to Gallon, more »

Temperature

Is it getting hot in here? Temperature conversions can get tricky sometimges, unless you use our temperature conversion tool!

Celsius to Fahrenheit, Kelvin to Celsius, more »

Velocity

Miles per hour to Kilometer per hour and backwards — In the need for speed our velocity conversion calculator is your tool for success!

Knot to Mile / Hour, Mile / Hour to Knot, more »

Power

Feeling energized? Our power conversion tool is equipped with everything you need to go from watts to kilowatts and up to megawatts.

Watt to Horsepower, Kilowatt to Watt, more »

Angles

Need to know how to convert degrees to radians? Then come on in, we also master degrees, points and circles in our angle conversion tool.

Degree to Radian, Radian to Gradient, more »

Data Storage

Everything in computing is zeros and ones. Bits and bytes are essentially building our computer world, and our data storage conversion tool is here to make some order out of the chaos.

Terabyte to Gigabyte, Gigabyte to Byte, more »

Number Systems

There are 10 types of people in this world, those who understand binary and those who don't — Our number systems converter will make you the former :-)

Binary to Decimal, Decimal to Octal, more »

Cooking

First step in becoming a master chef is knowing how to read the recipe right — How many teaspoons are in a tablespoon? The answer for this and many more is inside...

Teaspoon to Tablespoon, Cup to Shot, more »

Time Zones

What is the time in Russia? Well, with eleven different time zones, the answer is "it depends"... In any case, our time zones converter makes it easy to find out.

New York, USA to Jerusalem, Israel, more »

Math

"Nature is written in mathematical language" — With our collection of math calculators and expression evaluator everyone can perform useful mathematical calculations in seconds.

(100 * 0.3) + 15, gcd(100, 15), more »

Octagon Area

In geometry, an octagon is an eight-sided polygon or 8-gon. A regular octagon has Schläfli symbol {8} and can also be constructed as a quasiregular truncated square, t{4}, which alternates two types of edges.

Area = 2 * (1 + √2) * side²

Side

Details:

A = 2 * (1 + √2) * side² =

Rate this calculator:3.8 / 8 votes

More Calculators

Free online math calculators like: Quadratic Equation calculator, Natural Logarithm calculator, Geometry and more — along with tons of other free calculators.

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yfa_k
the best calculator everseen
LikeReply 21 year ago
courtneye
Calculators.net is my go-to destination for all things calculation-related. From basic arithmetic to complex scientific functions, this website has a user-friendly interface and an impressive array of calculators that make number crunching a breeze. The convenience and accuracy of the calculators have been a game-changer for me in both work and personal projects. It's a reliable tool that simplifies the math, and I highly recommend it for anyone seeking efficient and accessible online calculators. more »
LikeReply1 year ago
alebadah_c
It's Very Good website Continue
LikeReply 62 years ago
- imels.44823
  I agree. They got all the numbers information here. Very educational.
  LikeReply 11 year ago