Choose a category
21 categories: concrete, GCD, BMR, deposits, physics, IT and pay. Each section has its own list and its own formula.
Browse calculators by category
Health, converters, real estate, finance and dates. Open a section to reach the tools. Set currency and units in the header.
Health calculators
BMR, TDEE, water and protein. Formula numbers, not a diagnosis.
Unit converters
Kilometers, gallons, bars and feet. SI, US and UK definitions stay separate.
Real estate calculators
Area, price per square metre and home loans. Formulas on separate pages.
Finance calculators
Deposit, VAT, loan payment and inflation. Each formula stays on its own page.
Date and time
Date difference, age and countdown. Calendar math, not time zones.
Construction calculators
Concrete, paint, tiles, roof pitch and mortar. Volume and waste on separate pages.
Business calculators
Margin, markup and break-even. Accounting formulas, not a company valuation.
Motoring calculators
Fuel use, TCO and leasing. Car costs on separate pages.
Salary calculators
Gross, net and leave. Contributions live on separate pages.
Esoteric
Zodiac, numbers and biorhythms. Date and name tools, not fortune telling.
Physics calculators
Mechanics, current, waves and heat. Each formula has its own page.
Mathematics calculators
GCD, circle area, percent, volumes and sequences. Each formula on its own page.
Cooking calculators
Cups, portions and alcohol. Kitchen conversions, not a diet plan.
IT calculators
Network, storage and developer tools. Each formula on its own page.
Ecology calculators
Carbon footprint and energy. Estimates, not a certificate.
Lifestyle
Commute, subscriptions and office days. Cost estimates, not life advice.
Music calculators
BPM, cents, intervals and frequencies. Each conversion has its own page.
Biometrics and prevention
Screening and risk from formulas. Not a diagnosis.
Agentic commerce
Agent and autonomous-transaction costs. Estimates, not legal advice.
AI regulation
Compliance, risk and the AI Act. Estimates, not legal advice.
Games and toys
Snake, Tetris, Minesweeper, boxing and a poster. Play on a calculator keypad.