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Calculators for everyday life and online business

Calculate percentages, discounts, salary estimates, savings growth, tax estimates, and marketplace seller profit with simple browser-based tools. No account required.

All calculators

Percentage CalculatorCalculate percentages, find what percent one number is of another, and increase or decrease values.Discount CalculatorCalculate sale prices, discount amounts, and savings before you buy or sell products.Profit & Margin CalculatorCalculate revenue, costs, gross profit, profit margin, markup, and return on investment.Basic CalculatorPerform everyday addition, subtraction, multiplication, and division with this free online calculator.Sales Tax CalculatorEstimate sales tax and total purchase price using a rate you enter for your location.Salary CalculatorConvert hourly pay into estimated daily, weekly, monthly, and annual earnings.Age CalculatorCalculate your age in years, months, and days from your date of birth.Compound Interest CalculatorEstimate how savings or investments may grow with compound interest over time.Percentage Change CalculatorFind the percentage increase or decrease between an original value and a new value.Loan / EMI CalculatorEstimate monthly loan payments, total repayment, and total interest from loan details.Currency ConverterConvert currencies using an exchange rate you provide. Rates may change frequently.Break-Even CalculatorEstimate how many units you need to sell to cover fixed costs and per-unit costs.Hourly to Salary CalculatorConvert hourly wages into daily, weekly, monthly, and annual salary estimates.VAT / GST CalculatorCalculate VAT or GST amounts and tax-inclusive or tax-exclusive prices using your local rate.BMI CalculatorCalculate body mass index from height and weight using metric or imperial measurements.Date Difference CalculatorCalculate the number of days between two dates for planning and scheduling.Time CalculatorAdd or subtract hours and minutes to calculate elapsed or finishing time.Unit ConverterConvert common length, weight, and temperature units with simple inputs.Fuel Cost CalculatorEstimate trip fuel use and fuel cost based on distance, efficiency, and fuel price.Savings Goal CalculatorEstimate how long it may take to reach a savings target with regular contributions.

E-commerce seller calculators

Estimate seller fees and profit for eBay, Amazon, Etsy, Walmart, Shopify, and dropshipping. Compare scenarios by entering the fee rates that apply to your marketplace, product category, and country.

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How to use these tools

Choose a calculator, enter your values, and select Calculate. Results are estimates based on your inputs. Tax rates, exchange rates, and marketplace fees can change, so verify important details with official sources.