Maths & percentages

Maths

Percentage calculator

Work out any percentage, three ways.

Maths

Percentage increase calculator

Add a percentage rise to any starting number.

Maths

Percentage change calculator

Increase or decrease between two values.

Maths

Percentage decrease calculator

Take a percentage off any starting number.

Maths

Percentage difference calculator

Symmetric difference between two values.

Maths

Fraction calculator

Add, subtract, multiply or divide fractions.

Maths

Fraction to decimal converter

Fractions to decimals and back, simplified.

Maths

Ratio calculator

Simplify ratios or find the missing value.

Maths

Mean, median & mode calculator

Mean, median, mode and more from any list.

Maths

Standard deviation calculator

Sample and population sd from your data.

Maths

Rounding & significant figures calculator

Round to decimal places or sig figs.

Maths

Roman numerals converter

Numbers to Roman numerals and back.