Free calculators and tools
Every tool gives you the answer, shows the working, and runs in your browser, so nothing you type leaves your device. There are no accounts and no sign-ups.
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Money
VAT, margins, discounts and pricing
- VAT CalculatorAdd VAT to a price, or take it out of a price that already includes it.
- Profit Margin CalculatorWork out margin from cost and price, or the price for the margin you want.
- Markup CalculatorFind the selling price from your cost and markup, or the markup from two prices.
- Discount CalculatorPrice after a percentage off, the discount from two prices, or the original price.
Everyday calculations
Percentages, dates and hours
- Percentage CalculatorA percentage of a number, one number as a percentage of another, and more.
- Percentage Change CalculatorThe percentage increase or decrease between two numbers.
- Hours CalculatorHours worked between two times with breaks, or add up lengths of time.
- Date CalculatorDays, weeks and working days between two dates, or add days to a date.
Business
Break-even, ROI, subscriptions and growth
- Break-Even CalculatorHow many units you must sell to cover your costs or hit a profit target.
- ROI CalculatorReturn on investment as a percentage, with profit and average yearly return.
- Commission CalculatorSales commission at a flat rate or in tiers, or the sales needed for a target.
- Product Pricing CalculatorThe price to charge so fees and VAT still leave the margin you want.
- MRR & ARR CalculatorMonthly and annual recurring revenue from customers and average price.
- Subscription Revenue CalculatorForecast subscription revenue month by month, with sign-ups and churn.
- CAC Payback CalculatorHow many months a customer takes to pay back what it cost to win them.
Freelance
Day rates, hourly rates and utilisation
- Freelance Day Rate CalculatorThe day and hourly rate a freelancer needs to hit an income target.
- Hourly Rate CalculatorThe hourly rate needed for an income target, or a salary as an hourly rate.
- Annual Income CalculatorTurn hourly, daily, weekly or monthly pay into a yearly income.
- Utilisation Rate CalculatorYour utilisation rate from billable and available hours, and what unbilled time costs.
- Project Profitability CalculatorWhat a project really paid per hour after expenses, against your target.
Maths
Fractions, quadratics and number theory
- Quadratic Equation SolverSolve ax² + bx + c = 0 with every step, including complex answers.
- Mean, Median & Mode CalculatorMean, median, mode, range and standard deviation for a list of numbers.
- Fraction CalculatorAdd, subtract, multiply or divide fractions and mixed numbers, step by step.
- Pythagorean Theorem CalculatorFind a missing side of a right-angled triangle, plus area and angles.
- GCF & LCM CalculatorGreatest common factor and least common multiple, with prime factors.
Science
Density, Ohm's law, speed and temperature
- Ohm's Law CalculatorEnter any two of voltage, current, resistance and power to find the rest.
- Speed, Distance & Time CalculatorEnter any two of speed, distance and time to find the third.
- Density CalculatorEnter any two of mass, volume and density to find the third.
- Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin, with the formula shown.
Files
PDF, image and CSV tools that never upload
- JPG, PNG and WebP ConverterConvert images between JPG, PNG and WebP without uploading them.
- CSV Duplicate RemoverRemove duplicate rows from a CSV file. Nothing is uploaded.
- CSV to PDF ReportTurn a CSV or pasted spreadsheet rows into a clean PDF report.
- Image Resizer and CompressorResize and compress JPG, PNG and WebP images on your device.
- Merge PDF FilesCombine several PDFs into one, in the order you choose.
- Remove Photo Location Data (EXIF)Strip GPS location and camera details from photos.
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