Calculators

Calculators for everyday decisions and serious math. On the finance side: simple interest, compound interest with monthly contributions, currency converter with live exchange rates, Brazilian labor calculators (rescisão CLT, férias CLT) and more. On health: BMI calculator with the official WHO classification. On math: percentage (X% of Y, increase, decrease, difference), rule of three, LCM, GCD, prime factorization, modulo, Roman numerals and random number picker with or without repetition. For conversions: a universal unit converter with 50+ options (length, mass, volume, temperature, area, speed, energy, pressure, time). All formulas are shown — no black box. Real-time results as you type, no signup, 100% in your browser. Useful for students, HR professionals, accountants, investors, engineers and anyone who needs a fast, reliable calculator without installing an app.