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.
Open calculatorBody Fat & BMI Calculator
Two key health numbers from simple measurements. Enter gender, age, height, weight and neck, waist (and hip for women) circumference — the Navy method estimates body fat while BMI checks your weight band.
Open calculatorCompound Interest Calculator
See how reinvested returns accelerate wealth over time. Enter a starting amount, a monthly contribution and an annual return to project your balance year by year.
Open calculatorMortgage & Amortization Calculator
See your monthly payment, lifetime interest and payoff date at a glance. Enter a home price, down payment, term and rate — then add an extra monthly payment to see how fast you can own the home free and clear.
Open calculatorAuto Loan & Payment Calculator
See exactly what a car costs to finance. Enter the vehicle price, down payment, trade-in and sales tax, then choose a term and rate — the payment, interest and full schedule update instantly.
Open calculatorStudent Loan & Repayment Plan Calculator
Map your repayment before it starts. Enter the loan amount, rate and term, add a grace period or an extra monthly payment — the payment, interest and payoff date update instantly.
Open calculatorLease vs Buy Auto Calculator
Run both numbers side by side. Enter the vehicle price, loan rate, money factor and residual — the calculator nets out ownership equity, fees and tax to name the cheaper option.
Open calculatorCredit Card Payoff Calculator
Pick a payment strategy — a fixed monthly amount or the card minimum — add an extra payment, and see exactly when the balance hits zero and how much interest you avoid.
Open calculatorMortgage Refinance Calculator
Run the numbers before you sign. Compare your current payment and remaining interest with a new loan — the calculator finds your monthly savings, break-even point and lifetime net saving.
Open calculatorWhy it is different
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.
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Finance
Compounding, retirement targets and inflation-adjusted returns.