Calculator Tools
23 free online calculator tools — 100% browser-based.
Unit Converter
Convert between length, weight, volume, temperature, speed, and more. 10+ unit categories. Free, instant, no signup.
CalculatorBMI Calculator
Calculate your Body Mass Index from height and weight. Get health category and recommendations. Free, instant, no signup.
CalculatorAge Calculator
Calculate your exact age in years, months, and days from your date of birth. Free, instant, no signup required.
CalculatorLoan Calculator
Calculate monthly payments, total interest, and amortization schedule for any loan or mortgage. Free, instant results.
CalculatorIncome Tax Calculator
Estimate your federal and state income tax, FICA, and take-home pay for any US state. Free, instant, no signup.
CalculatorTip Calculator
Calculate tip amount and split the bill between multiple people. Free online tip calculator with custom percentages. No signup.
CalculatorPercentage Calculator
Calculate percentages, percentage of a number, and percentage change. Free online calculator with instant results. No signup.
CalculatorAspect Ratio Calculator
Calculate dimensions that keep the same aspect ratio. Free online tool for images, video, and screens. No signup, instant results.
CalculatorTemperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Free online temperature converter, no signup required.
CalculatorRoman Numeral Converter
Convert between Roman numerals and Arabic numbers (1-3999). Free online converter with instant results. No signup needed.
CalculatorTime Zone Converter
Convert any date and time across multiple time zones at once. Free online tool with DST support. No signup, browser-based.
CalculatorCurrency Converter
Convert between 24 world currencies with indicative rates. Free online currency converter, instant results, no signup, no API key.
CalculatorCompound Interest Calculator
Free compound interest calculator with yearly breakdown, monthly contributions, and chart visualization. No signup, browser-based.
CalculatorSalary Calculator
Convert hourly, daily, weekly, monthly and annual salary instantly. Free online salary converter with custom work hours. No signup.
CalculatorDiscount Calculator
Calculate sale price, savings and reverse discount percentage instantly. Free online discount calculator with original price finder. No signup.
CalculatorFuel Cost Calculator
Calculate trip fuel and cost with metric or imperial units and 4 currencies. Free online fuel cost calculator, no signup needed.
CalculatorGPA Calculator
Calculate cumulative GPA on a 4.0 scale with unlimited courses and credits. Free online GPA calculator with semester breakdown. No signup.
CalculatorPaycheck Calculator
Estimate take-home pay across countries with simple flat-tax models. Free online paycheck calculator, no signup, instant results.
CalculatorDue Date Calculator
Estimate your pregnancy due date and current week of pregnancy based on last period or conception date. Free, no signup.
CalculatorMortgage Calculator
Estimate monthly mortgage payments with PITI, PMI, HOA, taxes, and insurance. See total interest and payoff date.
CalculatorRefinance Calculator
See monthly savings, break-even point, and lifetime interest when refinancing your mortgage. Free and instant.
Calculator401(k) Retirement Calculator
Project your 401(k) balance at retirement with employer match, salary growth, and inflation.
CalculatorHELOC Calculator
Calculate your home equity line of credit: max credit line, interest-only payments, and total cost.
Calculator