Calculators
Finance, math, units, dates
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.
Tools in Calculators
BMI Calculator
Calculate Body Mass Index with WHO classification
Compound Interest Calculator
Calculate investments with compound interest and monthly contributions
Number Randomizer
Pick random numbers within a range, with or without repetition
Percentage Calculator
X% of Y, increase, decrease, change
Unit Converter
Convert length, mass, volume, temperature, area, speed and more
Currency Converter
Live FX rates
GCD Calculator
Greatest common divisor for up to 20 positive integers
LCM Calculator
Least common multiple for up to 20 positive integers
Modulo Calculator
Compute the quotient and remainder of an integer division
Prime Factorization
Decompose a number into prime factors and list its divisors
Roman Numerals Converter
Convert between Arabic (1–3999) and Roman numerals
Rule of Three
Solve direct and inverse proportions
Simple Interest Calculator
Calculate simple interest, amount, or solve for any variable