Calculators that give you an answer, not a subscription
Schengen day counting, FIRE projections and TDEE macros — computed instantly on your device, in your language.
Featured calculators
Built for the questions people actually search for.
Schengen Visa 90/180 Day Calculator
Add your past and planned trips to see exactly how many of your 90 days remain inside the rolling 180-day window — and the earliest date you can legally re-enter.
Open calculatorFIRE & Compound Interest Calculator
Model monthly investing with compound growth, salary increases and inflation, then see the age at which your portfolio can safely cover your annual spending.
Open calculatorTDEE & Macro Nutrition Calculator
Work out your basal metabolic rate, total daily energy expenditure and a protein-first macro split for your goal — in metric or imperial units.
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Instant, offline-capable
Every formula is shipped to the browser. No round-trip, no spinner, no server bill.
Nothing leaves your device
Trip dates, salaries and body metrics stay in local memory only.
Genuinely localised
English, German, Spanish and Chinese — including the formula explanations, not just the buttons.