Free · No sign-up · Private
Small tools for annoying jobs.
Calculators that give you the answer and show the working, and file tools that never upload your files. Everything runs in your browser.
Browse all 35 toolsTry the file tools
- Shows the working
- Tested against hand-worked answers
- Nothing leaves your device
Browse by topic
- MoneyVAT, margins, discounts and pricing4 tools
- Everyday calculationsPercentages, dates and hours4 tools
- BusinessBreak-even, ROI, subscriptions and growth7 tools
- FreelanceDay rates, hourly rates and utilisation5 tools
- MathsFractions, quadratics and number theory5 tools
- ScienceDensity, Ohm's law, speed and temperature4 tools
- FilesPDF, image and CSV tools that never upload6 tools
Popular
- MoneyVAT CalculatorAdd VAT to a price or find the VAT inside a price that already includes it. Choose 20%, 5% or 0%, or type your own rate. Free and instant.
- MoneyProfit Margin CalculatorWork out your profit margin from cost and price, or find the price to charge for the margin you want. Shows markup too. Free and instant.
- FreelanceFreelance Day Rate CalculatorWork out the day rate and hourly rate a freelancer or contractor needs to charge to hit an income target, allowing for holidays and unbilled days.
- Everyday calculationsPercentage CalculatorFind a percentage of a number, work out what percentage one number is of another, add or take off a percentage, or find the whole from a part.
- FilesMerge PDF FilesCombine several PDF files into one, in the order you choose. It runs in your browser, so your documents are never uploaded. Free, no sign-up.
- FilesCSV to PDF ReportTurn a CSV file or pasted spreadsheet rows into a clean PDF table report with a title, totals and page numbers. Free, and your data is never uploaded.
Why use these
- Private by designYour numbers and files stay on your device. No accounts, no uploads.
- Shows the workingEach result comes with a plain-English sentence and the formula behind it.
- Tested properlyChecked against hand-worked answers and thousands of random and nonsense inputs.