Maths and science calculators
These are the calculations that come up in coursework, in a lab notebook and occasionally in a workshop. Each one shows the formula it used, so the tool can be checked by hand rather than trusted blindly — which is the point if you are going to be asked to reproduce the working.
Reverse percentage
Find the original number before a percentage increase or decrease was applied.
Average percentage
Average percentages correctly by weighting each one by its sample size.
RSD calculator
Relative standard deviation and coefficient of variation, with sample and population options.
Punnett square
Monohybrid and dihybrid crosses with genotype and phenotype ratios worked out.
pH calculator
Convert between pH, pOH and hydrogen or hydroxide ion concentration.
Octagon calculator
Area, perimeter and both widths — plus the corner setback for cutting one from a square.
Complex numbers
Add, subtract, multiply and divide complex numbers, with polar form and conjugate.
RREF calculator
Reduce any matrix to row echelon form, with every row operation listed.
Polynomial calculator
Add, multiply and divide polynomials, or find every root including complex ones.
Series calculator
Arithmetic and geometric series — nth term, partial sum and sum to infinity.
Partial derivatives
Differentiate a multivariable function with respect to one variable, symbolically.
Moment of inertia
Second moment of area for beams and sections, with section modulus and radius of gyration.
Perimeter calculator
Perimeter and area for every common shape, including irregular polygons.
Looking for something else?
There are 88 calculators on the site across 11 subjects — tax, benefits, grades, trades, sport and everyday maths.
Browse every calculator