Calculators
Loan, EMI, interest, GST, discount, BMI and percentage calculators with clear, step-by-step results.
12 tools · all free, all run in your browser
Average Calculator
Find the mean, median, mode, range and standard deviation of any list of numbers.
Open toolBMI Calculator
Calculate Body Mass Index in metric or imperial units and see the healthy weight range for your height.
Open toolCompound Interest Calculator
Project how savings or investments grow over time with compounding and regular contributions.
Open toolDiscount Calculator
Find the sale price and how much you save, including stacked discounts and final price with tax.
Open toolEMI Calculator
Calculate your monthly loan instalment, total interest and full repayment schedule for any loan.
Open toolFuel Cost Calculator
Estimate the fuel cost of a trip from distance, fuel efficiency and price per unit.
Open toolGST / VAT Calculator
Add or remove GST, VAT or sales tax from any amount and see the tax component clearly.
Open toolLoan Calculator
See what a loan really costs — monthly payment, total interest and the payoff schedule over time.
Open toolPercentage Calculator
Work out percentages, percentage change and 'X is what percent of Y' with the working shown.
Open toolProfit Margin Calculator
Work out gross profit, margin and markup from cost and selling price — or find the price you need.
Open toolSimple Interest Calculator
Calculate simple interest and the total amount payable using the classic P × R × T formula.
Open toolTip Calculator
Work out the tip and split the bill evenly between any number of people.
Open toolThese calculators cover the arithmetic that decides real money and real decisions: what a loan actually costs once interest is included, how much a stacked discount really saves, what margin a price leaves you, and how an investment compounds over twenty years. Rather than returning a bare number, each one shows the working, the breakdown and — where it applies — a year-by-year schedule, so you can see where the figure comes from and sanity-check it against a quote you have been given.
Borrowing and repayment
The cost of a loan is dominated by two things people underestimate: the term and the direction of early payments. Because interest is charged on the outstanding balance, the first years of a long loan are mostly interest and barely touch the principal. Extending a term lowers the monthly payment but can dramatically increase the total repaid. The amortisation schedules here make both effects visible, and let you test what an extra payment each month would actually save.
Percentages, margins and pricing
Percentages are where quick mental maths most often goes wrong. Stacked discounts do not add — 20% then 10% is 28% off, not 30%. Margin and markup are not the same measure: a 50% markup on cost is only a 33.3% margin on the selling price. A rise and an equal-sized fall do not return you to the starting figure, because each applies to a different base. Each calculator here states which convention it is using so the result is unambiguous.
Estimates, not advice
Every financial figure produced here is an estimate based purely on the numbers you enter. Real lenders add processing fees, insurance and taxes, and quote an APR that folds those in; real investments carry fees, tax and sequence risk that a smooth projection cannot capture. Health measures such as BMI are population-level screening indicators rather than diagnoses. Use these tools to understand the shape of a decision, then confirm the specifics with a qualified professional.