How do you calculate a percentage?
Percentage = Part ÷ Whole × 100
36 out of 240 is 36 ÷ 240 × 100 = 15%. To find 15% of 240, reverse it: 15 ÷ 100 × 240 = 36.
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Percentages, discounts and tax
The everyday maths of pricing: percent changes, sale prices and tax added to or taken off a price.
- Percentage CalculatorPercent of a number, percentage change, difference, increase and decrease.
- Discount CalculatorSale price and savings, discount % from two prices, or stacked discounts.
- GST & VAT CalculatorAdd or remove GST, VAT or sales tax at any rate.
Pricing and profit
Set prices that leave a profit, compare margin with markup, and see what fees and commissions cost you.
- Profit Margin CalculatorProfit, margin and markup from cost and price, or the price for a target margin.
- Markup CalculatorTurn a markup into a selling price, or find the markup you charge now.
- Amazon FBA Fee CalculatorProfit per unit after referral and fulfilment fees, with dated sources.
- Commission CalculatorSales or affiliate commission at flat or tiered rates.
Interest, loans and investing
See how money grows, what a loan really costs, and the return on what you invest.
- Compound Interest CalculatorGrowth of savings with regular deposits and any compounding period.
- Loan CalculatorMonthly repayment (EMI), total interest and a full amortization schedule.
- Investment CalculatorWhat regular investing could grow to at an assumed rate of return.
- ROI & CAGR CalculatorReturn on investment, annualised return and compound annual growth rate.
Pay and freelancing
Convert hourly pay and price your time so the money left after tax and costs is what you planned.
- Freelance Hourly Rate CalculatorThe minimum hourly and day rate that meets your take-home goal.
- Hourly to Salary CalculatorConvert an hourly wage to weekly, monthly and yearly pay, and back.
Formulas people look up most
Each answer gives the formula, a worked example and a calculator to check your own numbers.
How do you calculate a discount?
Sale price = Price × (1 − Discount ÷ 100)
25% off 80 is 80 × 0.75 = 60. Two discounts multiply: 20% then 10% off is 28% off, not 30%.
How do you calculate profit margin?
Margin = (Price − Cost) ÷ Price × 100
Selling for 100 something that cost 65 leaves 35 profit, a 35% margin. Markup on the same sale is 35 ÷ 65 = 53.85%.
How do you calculate percentage change?
Change = (New − Original) ÷ Original × 100
Sales rising from 80 to 100 is a 25% increase. Falling back from 100 to 80 is a 20% decrease, because the starting value changed.
How do you calculate compound interest?
Final amount = P × (1 + r ÷ n)^(n × t)
10,000 at 5% a year, compounded monthly for 10 years, grows to about 16,470. Our compound interest calculator is coming soon.
How do you calculate ROI?
ROI = (Gain − Cost) ÷ Cost × 100
Spend 2,000 on a campaign that brings in 2,600 and your ROI is 600 ÷ 2,000 × 100 = 30%. Our ROI calculator is coming soon.
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