Compound Interest Calculator
Project investment growth from a starting balance, recurring monthly contributions, rate, term, and compounding frequency.
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Online Calculators
Browse every free calculator by topic. Each tool works in the browser and includes its formula, assumptions, and examples.
Finance
View categoryFinance Calculators
Mortgage & Loans
View categoryMortgage & Loan Calculators
Mortgage Calculator
Estimate a mortgage payment with principal, interest, property tax, home insurance, and total borrowing cost.
Use calculatorLoan Calculator
Calculate a fixed loan payment, total repayment, and total interest for a standard amortized loan.
Use calculatorSalary & Work
View categorySalary & Work Calculators
Math
View categoryMath Calculators
GPA Calculator
Calculate weighted and unweighted GPA from grade points and course credits on your chosen scale.
Use calculatorAverage Calculator
Find the arithmetic mean, median, sum, count, minimum, and maximum of a list of numbers.
Use calculatorGrade Calculator
Find the final-exam score needed for a target course grade and project the result from an expected score.
Use calculatorPercentage
View categoryPercentage Calculators
Percentage Calculator
Find a percentage of a number, determine what percent one value is of another, or measure percentage change.
Use calculatorAttendance Calculator
Calculate attendance percentage and determine how many classes can be missed or must be attended to reach a target.
Use calculatorTime & Date
View categoryTime & Date Calculators
Time Calculator
Calculate elapsed time between two clock times, including overnight spans and an optional break.
Use calculatorAge Calculator
Find exact age in years, months, and days on any chosen date, plus total elapsed days and the next birthday.
Use calculatorDate Calculator
Count calendar days, complete weeks, and weekdays between two dates with an optional inclusive end date.
Use calculatorDog Age Calculator
Estimate a dog's human-age equivalent using age and adult size, with a simple life-stage interpretation.
Use calculatorConversion
View categoryConversion Calculators
Health & Fitness
View categoryHealth & Fitness Calculators
BMI Calculator
Estimate body mass index from metric or imperial measurements and view the standard adult screening range.
Use calculatorOvulation Calculator
Estimate ovulation, fertile-window, and next-period dates from cycle timing assumptions.
Use calculatorPace Calculator
Calculate running or walking pace per kilometer and mile, average speed, and total elapsed time.
Use calculatorBusiness
View categoryBusiness Calculators
Concrete Calculator
Estimate slab concrete volume with metric or imperial dimensions, waste allowance, and bag quantities.
Use calculatorPaint Calculator
Estimate paint volume and whole containers from surface area, coats, coverage, and waste.
Use calculatorFlooring Calculator
Calculate room area, flooring with waste, and the number of packages required.
Use calculatorRoofing Calculator
Estimate sloped roof area, roofing squares, waste, and approximate shingle bundles.
Use calculatorEveryday Life
View categoryEveryday Life Calculators
Tip Calculator
Calculate a tip, final bill total, and equal per-person share in one quick step.
Use calculatorDiscount Calculator
Find savings, discounted price, tax on the reduced price, and the final amount to pay.
Use calculatorFuel Cost Calculator
Estimate fuel needed, total trip cost, cost per distance, and an equal per-person share.
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