Welcome to Alcula`, home of the Online Scientific Calculator

Simple and advanced online calculators for math and statistics, units conversion and more...

New! Online Scientific Calculator - Try the new Advanced Scientific Calculator from Alcula`.
It supports fractions, complex numbers and custom functions. It has an expression history so you can review your previous steps. You can also update a previous expression and all following expressions are updated automatically. A useful resource for students and teachers of mathematics. Read more about it in the blog or check out the instruction manual for a full list of the new features. The scientific calculator page is also available in French, Italian and Spanish.

New! Statistics Calculator
- Compute measures of location and dispersion.
Started as a simple standard deviation calculator, it now also calculates mean (average), median, mode, variance, quartiles, inter quartile range and deviation, and mean absolute deviation. Like other calculators on this site, the statistics calculator will expanded over the next few months, to include more common statistics formulas.
Simple Printing Calculator
- A virtual 9 digit pocket (!) calculator.
This Virtual Calculator emulates a real pocket calculator. It features basic operators and a virtual paper roll that displays your previous calculations. Type on your keyboard or use your mouse to press the buttons.

New! RPN Calculator
- A Reverse Polish Notation calculator.
Practice your RPN skills on the internet with this simple RPN Calculator. Javascript required.
Virtual Suan Pan
- Chinese abacus.
Suan Pan is the Chinese name for the Chinese abacus. It has two decks, the lower deck has 5 beads for each rod, the upper deck has two. To use the virtual suanpan, your browser must allow javascript. The version of Suan Pan on this website has 18 rods, you can perform calculations with numbers up to 18 digits.
Virtual Soroban
- Japanese abacus.
Soroban is the Japanese name for the Japanese abacus. Like the Chinese abacus, it has two decks, but the lower deck has 4 beads for each rod and the upper deck has only one. To use the soroban on this site, your browser must allow javascript. The Soroban on this site has 18 rods.
Units conversion.
- Convert lengths, areas and weights.
Select 'conversions' to go to the conversion pages. You can convert between many units of measure of length, area or weight.

How to calculate percentages with a calculator.
How to work out the percentage of a number when using a calculator that is missing the percent (%) key.

Standard deviation and more with Alcula's new statistics calculator
The statistics calculator calculates standard deviation, averages, quartile deviation and more. Check the latest blog entry for more information.