Free Online Calculators
Practical everyday calculators for finance, health, dates, and quick math. All run in your browser — no sign-up required.
Most Popular
Our highest-traffic calculators.
Mortgage Calculator
Calculate monthly payment, total interest, and amortization from home price, rate, and term.
🏖️Retirement Calculator
Project retirement savings balance from contributions, return rate, and employer match.
📈Compound Interest Calculator
Calculate future investment value with custom principal, rate, time, and compounding frequency.
📊CAGR Calculator
Calculate Compound Annual Growth Rate from beginning and ending investment values.
🌍Time Zone Converter
Convert any time between Eastern, Central, Mountain, Pacific, UTC, London, Paris, Tokyo, and Sydney.
⚖️BMI Calculator
Calculate Body Mass Index in metric or imperial. Includes BMI category reference table.
💰 Finance
Mortgage Calculator
Calculate monthly payment, total interest, and amortization from home price, rate, and term.
🏖️Retirement Calculator
Project retirement savings balance from contributions, return rate, and employer match.
📈Compound Interest Calculator
Calculate future investment value with custom principal, rate, time, and compounding frequency.
💰Savings Calculator
Project savings growth with starting balance, monthly contributions, and interest rate.
🏦Loan Calculator
Calculate monthly payment, total repayment, and total interest for any loan.
📋Amortization Schedule
Full payment-by-payment principal and interest breakdown for any loan.
📊CAGR Calculator
Calculate Compound Annual Growth Rate from beginning and ending investment values.
📉Inflation Calculator
Calculate how inflation erodes purchasing power and find inflation-adjusted values.
📅 Date & Time
Age Calculator
Calculate exact age in years, months, and days from any date of birth.
📅Date Difference Calculator
Find the exact difference between two dates in days, weeks, months, and years.
💼Business Days Calculator
Count working days between two dates, excluding weekends.
⏳Countdown Calculator
Count down to any future date in days, weeks, months, and years.
🌍Time Zone Converter
Convert any time between Eastern, Central, Mountain, Pacific, UTC, London, Paris, Tokyo, and Sydney.
⏱️Time Duration Calculator
Add or subtract hours, minutes, and seconds from any start time.
🏃 Health & Fitness
🧮 Everyday Math
Every calculator runs entirely in your browser — no data is sent to any server. Looking for unit converters instead?
Reference Libraries
Bookmark these reference tables for quick lookup alongside your calculations.
Finance Reference
Tax brackets, 401(k) limits, IRA limits, HSA limits, inflation history.
📅Date & Time Reference
Federal holidays, week numbers, day of year, calendar reference.
📐Measurement Reference
Metric prefixes, paper sizes, wire gauge, drill bits.
🖨️Printable Charts
Print-ready conversion and metric charts.