18 working calculators
All Calculators
Browse free calculators for money, business, everyday math, time, education, home, and transport. Every page includes a formula, worked example, and limitations.
Loan Payment Calculator
Estimate the monthly payment, total repayment, and total interest for a fixed-rate amortizing loan.
Money & FinanceCompound Interest Calculator
Project how a starting balance and monthly contributions may grow with monthly compounding.
Money & FinanceSavings Goal Calculator
Find the monthly saving needed to reach a target amount by a chosen date.
Money & FinanceInvestment Return / ROI Calculator
Calculate net gain or loss and return on investment as a percentage of total amount invested.
Money & FinanceRent vs Buy Calculator
Compare estimated renting cost with the equity-adjusted net cost of buying over a chosen stay.
Home & TransportProfit Margin Calculator
Calculate gross profit and profit margin from revenue and cost.
BusinessMarkup Calculator
Find profit per item and markup percentage from cost and selling price.
BusinessBreak-Even Calculator
Estimate how many whole units must be sold to cover fixed and variable costs.
BusinessHourly Rate Calculator
Estimate a freelance or consulting hourly rate from income target, business costs, and billable time.
BusinessSalary to Hourly Calculator
Convert annual salary to equivalent hourly, weekly, and monthly pay.
BusinessPercentage Calculator
Find a percentage of any positive or negative number.
Everyday MathDiscount Calculator
Calculate savings, discounted subtotal, optional tax, and final price.
Everyday MathTip and Bill Split Calculator
Calculate a tip, total bill, and equal amount per person.
Everyday MathUnit Price Comparison Calculator
Compare two package prices on the same per-unit basis.
Everyday MathFuel Cost Calculator
Estimate litres used and fuel cost for one or more trips using L/100 km.
Home & TransportAge Calculator
Calculate completed calendar years, days since the last birthday, and total elapsed days.
Time & DateDate Difference Calculator
Count elapsed or inclusive days and express the result in full weeks plus days.
Time & DateGrade Needed Calculator
Find the average grade needed on remaining coursework to reach a target final grade.
EducationPercentage Change Calculator
Measure the percentage increase or decrease from an original value to a new value.
Everyday MathElectricity Cost Calculator
Estimate electricity use and cost from appliance power, daily use, days, and unit price.
Home & Transport