Work out the number, then understand it

81 calculators for electronics, physics, chemistry and mathematics. Every one shows the formula it used, a worked example, and where the model stops being a good description of reality.

Search 81 calculators

Chemistry7

Converters2

Electronics18

Everyday tools5

Finance10

Health and fitness14

Mathematics11

Physics14

Browse by subject

Electronics

Circuit values, component sizing and the arithmetic you do at a bench.

18 calculators

Physics

Mechanics, waves, optics and thermodynamics from a first-year course.

14 calculators

Chemistry

Solutions, gases and stoichiometry with the units kept honest.

7 calculators

Mathematics

Algebra, geometry, statistics and a function plotter.

11 calculators

Converters

Units, number bases and notation, converted both ways.

2 calculators

Health and fitness

Body composition, energy expenditure and training numbers.

14 calculators

Finance

Interest, loans and savings growth over time.

10 calculators

Everyday tools

Dates, study tools and small utilities that do not belong anywhere else.

5 calculators