Free online calculators for everyday decisions.
Calculate payments, estimate savings, understand health measurements, solve math problems and plan dates with 35 practical tools. No signup. Your inputs stay in your browser.
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Choose a category or search for a specific calculation.
Financial Calculators
Plan payments, savings, loans, interest, salary and everyday financial decisions.
Mortgage Calculator
Estimate monthly mortgage payments, property costs and total loan interest from your home price, down payment, rate and loan term.
Open calculatorLoan Calculator
Calculate an estimated fixed monthly loan payment, total repayment and interest using the amount, annual rate and repayment term.
Open calculatorAuto Loan Calculator
Estimate car loan payments after a down payment and trade-in, including total interest and the amount financed.
Open calculatorInterest Calculator
Work out simple interest earned or charged over time from principal, annual interest rate and duration.
Open calculatorPayment Calculator
Estimate the regular payment required to repay a fixed-rate balance over a selected number of months or years.
Open calculatorRetirement Calculator
Project the value of retirement savings using your current age, savings, monthly contributions and assumed annual return.
Open calculatorAmortization Calculator
Estimate a fixed-rate loan amortization schedule, including principal, interest, total payments and remaining balance.
Open calculatorInvestment Calculator
Project investment growth from an initial deposit, recurring contributions, time horizon and assumed annual return.
Open calculatorInflation Calculator
Estimate how inflation changes purchasing power and the future cost of an item over a selected number of years.
Open calculatorFinance Calculator
Explore the future value of a starting balance and regular contributions under an assumed interest or investment rate.
Open calculatorIncome Tax Calculator
Estimate income tax and take-home income using annual income, deductions, credits and an adjustable effective tax rate.
Open calculatorCompound Interest Calculator
Calculate compound growth with selectable compounding frequency, starting principal and optional recurring contributions.
Open calculatorSalary Calculator
Convert gross annual salary into estimated pay-period, monthly and hourly amounts after an adjustable deduction percentage.
Open calculatorInterest Rate Calculator
Estimate the implied monthly and annual interest rate from a loan balance, fixed payment and number of payments.
Open calculatorSales Tax Calculator
Calculate sales tax, discount savings and the final price from an item price and percentage rates.
Open calculatorFitness & Health Calculators
Explore common fitness measurements and health-related estimates with clear limitations.
BMI Calculator
Calculate body mass index from height and weight, with the standard adult BMI category ranges and important limitations.
Open calculatorCalorie Calculator
Estimate daily calorie needs from age, height, weight, sex and activity level using a recognized resting-energy equation.
Open calculatorBody Fat Calculator
Estimate body fat percentage with the US Navy circumference method using height, waist, neck and hip measurements.
Open calculatorBMR Calculator
Estimate basal metabolic rate using age, sex, height and weight with the Mifflin–St Jeor equation.
Open calculatorIdeal Weight Calculator
Estimate a reference weight from height using the Devine formula, with a clear note about its limitations.
Open calculatorPace Calculator
Calculate running or walking pace, total time and speed from distance and elapsed time.
Open calculatorPregnancy Calculator
Estimate gestational age and a pregnancy timeline from the first day of the last menstrual period.
Open calculatorPregnancy Conception Calculator
Estimate a possible conception date from the last menstrual period and usual cycle length.
Open calculatorDue Date Calculator
Estimate an expected due date from the last menstrual period or a known conception date.
Open calculatorMath Calculators
Solve everyday math problems, fractions, percentages and scientific expressions.
Scientific Calculator
Use a browser-based scientific calculator for arithmetic, powers, roots, trigonometry and logarithms.
Open calculatorFraction Calculator
Add, subtract, multiply or divide two fractions and simplify the result to lowest terms.
Open calculatorPercentage Calculator
Find a percentage of a number, convert ratios to percentages and calculate percentage changes.
Open calculatorRandom Number Generator
Generate random whole numbers or decimal values within a minimum and maximum range in your browser.
Open calculatorStep Calculator
Estimate walking distance and approximate energy expenditure from step count, stride length and body weight.
Open calculatorOther Calculators
Calculate dates, age, time, working hours, triangles and GPA.
Age Calculator
Calculate your age in years, months and days between a birth date and a selected reference date.
Open calculatorDate Calculator
Find the number of days and approximate weeks between two calendar dates.
Open calculatorTime Calculator
Calculate the elapsed time between two clock times, including intervals that cross midnight.
Open calculatorHours Calculator
Convert hours and minutes into decimal hours and calculate pay from an optional hourly rate.
Open calculatorTriangle Calculator
Check whether three side lengths form a valid triangle and calculate its perimeter, area and angle measures.
Open calculatorGPA Calculator
Calculate a weighted grade point average from grade points and credit hours for each course.
Open calculatorUseful tools, transparent assumptions.
Every calculator explains its method and key limitations. Financial outputs are estimates rather than lender or tax quotes. Health calculations are educational screening estimates, not medical advice. Calculations run in your browser, and entered values are not sent to FastSEOHub.