Math & Financial Calculators

Fast browser-based financial and mathematical calculators: compound interest, mortgage amortization, 3-way percentages, and age metrics.

Calculate percentages easily: What is X% of Y, X is what % of Y, and percentage increase or decrease between two numbers.

Calculate investment growth, total principal, interest compounded annually/monthly, and future portfolio value.

Calculate monthly mortgage payments, loan amortization, total interest cost, and principal payoff schedule.

Calculate restaurant tips, custom percentages, tax amounts, and split the bill evenly per person.

Convert standard numbers to Roman numerals (e.g. 2026 to MMXXVI) and decode Roman numeral strings back to integers.

Calculate your exact age in years, months, weeks, days, hours, and minutes, along with days until next birthday.