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Free, accurate calculators for finance, health, math, dates, and everyday life — every formula built from a published source and independently reviewed.
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Mortgage CalculatorEstimate your monthly mortgage payment, total interest, and payoff schedule from home price, down payment, rate, and term — with taxes, insurance, and PMI.BMI CalculatorCalculate your Body Mass Index from height and weight, with the WHO category, your healthy-weight range, BMI Prime, and Ponderal Index.Percentage Calculator — what percent one number is of anotherWork out what percent one number is of another: percentage = part ÷ whole × 100. Enter a part and a whole to get the exact percentage, with the steps shown.Scientific Calculator — trig, logs, powers, and rootsA free online scientific calculator with sine, cosine, and tangent (and inverses), natural and base-10 logarithms, powers, roots, factorials, π and e, parentheses, and a degrees/radians switch.Income Tax CalculatorEstimate your 2026 US federal income tax from filing status and income, with a bracket-by-bracket breakdown, effective rate, and marginal rate — from IRS figures.Loan Calculator — compare rates & terms side by sideCompare loan scenarios: monthly payment and total cost for one amount at different rates and terms. See whether a shorter term or a lower rate actually saves more.GPA Calculator — grade point averageCalculate your GPA from letter grades and credit hours. GPA is the credit-weighted average of grade points on the 4.0 scale. For B (3 credits), A- (4), C (2) and C (3) the GPA is about 2.81.Length Converter — meters, feet, inches, miles & moreConvert length and distance between metric and imperial units — meters, centimeters, kilometers, inches, feet, yards and miles. 1 meter is 3.2808 feet.
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Brazil 13th Salary Calculator (Décimo Terceiro)Brazilian 13th salary (décimo terceiro): salary ÷ 12 × months worked, paid in two parcelas with INSS and IRRF on the second. R$3,000 nets R$2,751.40.Brazil Vacation Pay Calculator (Férias)Brazilian vacation pay (férias): salary for the days taken plus the ⅓ constitutional bonus, minus INSS and IRRF. R$3,000 over 30 days nets R$3,631.40.Brazil Overtime Pay Calculator (Hora Extra)Brazilian overtime pay (hora extra) under the CLT: hourly rate = salary ÷ monthly hours, times a 50% (or 100% rest-day) adicional. Editable for collective agreements.Brazil Severance Calculator (Rescisão)Brazilian termination pay (rescisão): salary balance, aviso prévio, 13º + vacation, and the FGTS 40% multa by separation type. A R$3,000 dismissal ≈ R$12,618.90.Brazil Net Salary Calculator (Salário Líquido)Brazilian net salary from gross — INSS + IRRF with the 2026 Lei 15.270 redutor. Income up to R$5,000 is exempt; a R$5,000 salary nets R$4,498.49.Calorie Deficit Calculator — daily target for weight lossFind your daily calorie target to lose weight — maintenance calories minus your chosen deficit. Mifflin-St Jeor BMR and FAO activity levels.