Fast private online calculators
Enter values and get clear results instantly. Calculators run locally, update as you edit and let you copy the result in one click.
Browse tools ↓No accounts or friction
All calculators tools
Open any utility and start working. Each card tells you whether processing is local or requires a public API.
Sales tax calculatorSales tax calculator instantly and privately in your browser.100% local→Discount price calculatorDiscount price calculator instantly and privately in your browser.100% local→Unit price calculatorUnit price calculator instantly and privately in your browser.100% local→Sales commission calculatorSales commission calculator instantly and privately in your browser.100% local→Net price from grossNet price from gross instantly and privately in your browser.100% local→Gross profit calculatorGross profit calculator instantly and privately in your browser.100% local→Contribution margin calculatorContribution margin calculator instantly and privately in your browser.100% local→Inventory turnover calculatorInventory turnover calculator instantly and privately in your browser.100% local→Customer lifetime valueCustomer lifetime value instantly and privately in your browser.100% local→Churn rate calculatorChurn rate calculator instantly and privately in your browser.100% local→Conversion rate calculatorConversion rate calculator instantly and privately in your browser.100% local→Cost per click calculatorCost per click calculator instantly and privately in your browser.100% local→CPM calculatorCPM calculator instantly and privately in your browser.100% local→Cost per acquisitionCost per acquisition instantly and privately in your browser.100% local→Return on ad spendReturn on ad spend instantly and privately in your browser.100% local→Email open rateEmail open rate instantly and privately in your browser.100% local→Click-through rateClick-through rate instantly and privately in your browser.100% local→Occupancy rateOccupancy rate instantly and privately in your browser.100% local→Revenue per available roomRevenue per available room instantly and privately in your browser.100% local→Straight-line depreciationStraight-line depreciation instantly and privately in your browser.100% local→Declining balance depreciationDeclining balance depreciation instantly and privately in your browser.100% local→Present value calculatorPresent value calculator instantly and privately in your browser.100% local→Future value calculatorFuture value calculator instantly and privately in your browser.100% local→Inflation impact calculatorInflation impact calculator instantly and privately in your browser.100% local→Future purchasing powerFuture purchasing power instantly and privately in your browser.100% local→Emergency fund calculatorEmergency fund calculator instantly and privately in your browser.100% local→Retirement savings projectionRetirement savings projection instantly and privately in your browser.100% local→Mortgage affordability estimateMortgage affordability estimate instantly and privately in your browser.100% local→Debt-to-income ratioDebt-to-income ratio instantly and privately in your browser.100% local→Credit utilization ratioCredit utilization ratio instantly and privately in your browser.100% local→Rent-to-income ratioRent-to-income ratio instantly and privately in your browser.100% local→Annualized return calculatorAnnualized return calculator instantly and privately in your browser.100% local→CAGR calculatorCAGR calculator instantly and privately in your browser.100% local→Dividend yield calculatorDividend yield calculator instantly and privately in your browser.100% local→Earnings per shareEarnings per share instantly and privately in your browser.100% local→Price-to-earnings ratioPrice-to-earnings ratio instantly and privately in your browser.100% local→Working capital calculatorWorking capital calculator instantly and privately in your browser.100% local→Current ratio calculatorCurrent ratio calculator instantly and privately in your browser.100% local→Quick ratio calculatorQuick ratio calculator instantly and privately in your browser.100% local→Cash runway calculatorCash runway calculator instantly and privately in your browser.100% local→Absolute differenceAbsolute difference instantly and privately in your browser.100% local→Ratio calculatorRatio calculator instantly and privately in your browser.100% local→Quadratic equation solverQuadratic equation solver instantly and privately in your browser.100% local→Circle calculatorCircle calculator instantly and privately in your browser.100% local→Rectangle calculatorRectangle calculator instantly and privately in your browser.100% local→Triangle area calculatorTriangle area calculator instantly and privately in your browser.100% local→Trapezoid area calculatorTrapezoid area calculator instantly and privately in your browser.100% local→Sphere calculatorSphere calculator instantly and privately in your browser.100% local→Cylinder calculatorCylinder calculator instantly and privately in your browser.100% local→Cone calculatorCone calculator instantly and privately in your browser.100% local→Pythagorean theorem calculatorPythagorean theorem calculator instantly and privately in your browser.100% local→2D distance calculator2D distance calculator instantly and privately in your browser.100% local→Midpoint calculatorMidpoint calculator instantly and privately in your browser.100% local→Slope calculatorSlope calculator instantly and privately in your browser.100% local→Standard deviation calculatorStandard deviation calculator instantly and privately in your browser.100% local→Variance calculatorVariance calculator instantly and privately in your browser.100% local→Weighted average calculatorWeighted average calculator instantly and privately in your browser.100% local→Z-score calculatorZ-score calculator instantly and privately in your browser.100% local→Factorial calculatorFactorial calculator instantly and privately in your browser.100% local→Prime number checkerPrime number checker instantly and privately in your browser.100% local→Prime factorizationPrime factorization instantly and privately in your browser.100% local→Least common multipleLeast common multiple instantly and privately in your browser.100% local→Greatest common divisorGreatest common divisor instantly and privately in your browser.100% local→Modulo calculatorModulo calculator instantly and privately in your browser.100% local→Logarithm calculatorLogarithm calculator instantly and privately in your browser.100% local→Nth root calculatorNth root calculator instantly and privately in your browser.100% local→Ohm’s law calculatorOhm’s law calculator instantly and privately in your browser.100% local→Series resistor calculatorSeries resistor calculator instantly and privately in your browser.100% local→Parallel resistor calculatorParallel resistor calculator instantly and privately in your browser.100% local→LED resistor calculatorLED resistor calculator instantly and privately in your browser.100% local→
Simple tools for real tasks
Solve business, math, geometry, statistics and electronics calculations directly in your browser.
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.