All calculators
Every calculator lists its formula, its sources and the expert who reviewed it.
Health & Medicine
Clinical and wellbeing calculators reviewed by practising doctors, dietitians and pharmacists: body measurements, pregnancy, dosing aids and risk scores.
Engineering
Structural, mechanical, electrical and civil engineering calculators, checked by chartered and registered engineers against the relevant codes and textbooks.
Physics
Mechanics, thermodynamics, optics and electromagnetism, with the equations and units shown for every result.
Chemistry
Concentrations, dilutions, stoichiometry and gas laws for students and laboratory work.
Finance
Loans, mortgages, savings, investment returns and inflation, with transparent formulas and assumptions.
Mathematics
Algebra, geometry, trigonometry and calculus tools that show their working.
Statistics
Probability, sample sizes, confidence intervals and hypothesis tests, explained step by step.
Unit conversion
Precise conversions between metric, imperial and scientific units, using exact definitions.
Everyday life
Dates, time, age, percentages, cooking and travel calculations.