Online calculators and converters
Solve everyday calculations without spreadsheets or complex forms. Formulas are shown when useful, and local converters work offline.
Browse tools ↓No accounts or friction
All finance tools
Open any utility and start working. Each card tells you whether processing is local or requires a public API.
Unit converterConvert length, mass, temperature and digital storage units instantly and offline.100% local→Currency converterConvert amounts between currencies with Frankfurter, exchange date, swap action and copyable result.External API→VAT calculatorCalculate VAT from prices with or without tax.100% local→Percentage calculatorCalculate percentages, changes, increases and discounts with clear formulas.100% local→Tip calculatorTip calculator locally in your browser, with a clear result you can copy.100% local→Split bill calculatorSplit bill calculator locally in your browser, with a clear result you can copy.100% local→Loan payment calculatorLoan payment calculator locally in your browser, with a clear result you can copy.100% local→Compound interest calculatorCompound interest calculator locally in your browser, with a clear result you can copy.100% local→Simple interest calculatorSimple interest calculator locally in your browser, with a clear result you can copy.100% local→Savings goal calculatorSavings goal calculator locally in your browser, with a clear result you can copy.100% local→ROI calculatorROI calculator locally in your browser, with a clear result you can copy.100% local→Profit margin calculatorProfit margin calculator locally in your browser, with a clear result you can copy.100% local→Markup calculatorMarkup calculator locally in your browser, with a clear result you can copy.100% local→Break-even calculatorBreak-even calculator locally in your browser, with a clear result you can copy.100% local→Salary to hourly rateSalary to hourly rate locally in your browser, with a clear result you can copy.100% local→Freelance rate calculatorFreelance rate calculator locally in your browser, with a clear result you can copy.100% local→Fuel cost calculatorFuel cost calculator locally in your browser, with a clear result you can copy.100% local→Electricity cost calculatorElectricity cost calculator locally in your browser, with a clear result you can copy.100% local→Running pace calculatorRunning pace calculator locally in your browser, with a clear result you can copy.100% local→BMI calculatorBMI calculator locally in your browser, with a clear result you can copy.100% local→Daily calorie needs estimatorDaily calorie needs estimator locally in your browser, with a clear result you can copy.100% local→Body fat estimatorBody fat estimator locally in your browser, with a clear result you can copy.100% local→Rule of three calculatorRule of three calculator locally in your browser, with a clear result you can copy.100% local→Fraction simplifierFraction simplifier locally in your browser, with a clear result you can copy.100% local→Fraction to decimalFraction to decimal locally in your browser, with a clear result you can copy.100% local→Decimal to fractionDecimal to fraction locally in your browser, with a clear result you can copy.100% local→Scientific notation converterScientific notation converter locally in your browser, with a clear result you can copy.100% local→Average calculatorAverage calculator locally in your browser, with a clear result you can copy.100% local→Median calculatorMedian calculator locally in your browser, with a clear result you can copy.100% local→Age calculatorAge calculator locally in your browser, with a clear result you can copy.100% local→Date difference calculatorDate difference calculator locally in your browser, with a clear result you can copy.100% local→Business days calculatorBusiness days calculator locally in your browser, with a clear result you can copy.100% local→Add or subtract daysAdd or subtract days locally in your browser, with a clear result you can copy.100% local→ISO week number calculatorISO week number calculator locally in your browser, with a clear result you can copy.100% local→Day of year calculatorDay of year calculator locally in your browser, with a clear result you can copy.100% local→Leap year checkerLeap year checker locally in your browser, with a clear result you can copy.100% local→UTC offset time converterUTC offset time converter locally in your browser, with a clear result you can copy.100% local→Countdown calculatorCountdown calculator locally in your browser, with a clear result you can copy.100% local→Hours and minutes calculatorHours and minutes calculator locally in your browser, with a clear result you can copy.100% local→Cooking unit converterCooking unit converter locally in your browser, with a clear result you can copy.100% local→Angle converterAngle converter locally in your browser, with a clear result you can copy.100% local→Speed converterSpeed converter locally in your browser, with a clear result you can copy.100% local→Pressure converterPressure converter locally in your browser, with a clear result you can copy.100% local→Energy converterEnergy converter locally in your browser, with a clear result you can copy.100% local→
Simple tools for real tasks
Calculate percentages, VAT and unit or currency conversions with clear, copyable results.
Each tool focuses on one task, with a visible primary action, useful examples and results you can copy or download. There are no unnecessary dashboards or registration flows.
Frequently asked questions
Are these tools free?
Yes. You can use them without creating an account or artificial usage limits.
Are my data or files uploaded?
Tools marked 100% local process everything in your browser. If a utility needs an external API, it is clearly identified before you open it.
Do they work on mobile and in dark mode?
Yes. The interface is mobile first, keyboard accessible and supports both light and dark modes.