Useful before you install

Free calculators and practical tool guides.

Fast answers for common jobs, with transparent formulas and no values sent to our servers.

Unit ConverterConvert common length and distance units without searching through a conversion table.Currency ConverterCalculate a currency conversion with an exchange rate from your bank, card provider or current market source.Tip Split CalculatorWork out the total tip and a fair per-person amount without passing a phone around the table.Discount CalculatorSee the final price and saving before you reach the checkout.Unit Price CalculatorCompare two pack sizes side by side. Enter each pack’s price and total quantity; the calculator puts compatible units on the same basis.VAT CalculatorChoose whether to add VAT to a net amount or remove it from a gross amount. This is arithmetic using your entered rate, not tax advice.Paint CalculatorPlan one paint product from a known area, a rectangular room or individual walls. Check net area, full coats and whole tins using your product’s stated coverage.Tile CalculatorCalculate a practical tile quantity, including a configurable allowance for cuts and breakage.Concrete CalculatorEstimate the volume of a simple rectangular concrete pour before ordering material.Stair Riser CalculatorGet a first-pass riser count for planning a straight stair layout.Fuel Cost CalculatorUse the units your vehicle and fuel receipt actually show. Estimate a complete trip in miles or kilometres, with UK/US MPG or litres per 100 km.BMI CalculatorCalculate the standard metric BMI number from height and weight.Running Pace CalculatorTurn a finish time and distance into an average pace per kilometre.Recipe ScalerResize a whole ingredient list when a recipe serves too many—or not enough—people. Enter your servings and keep the original units.Coffee Ratio CalculatorFind a repeatable coffee dose for pour-over, filter or another weight-based brew.Secure Password GeneratorCreate a strong random password locally. The generated value never leaves this page.Free QR Code GeneratorMake a scannable code for text or a link, then download a PNG image or an SVG for printing. Your input stays in this browser.Private Document Scanner for iPhoneCapture paper, recognise text and prepare a useful PDF without creating an account for another scanner service.PDF Tools for iPhoneHandle the small PDF jobs that otherwise send you searching for a website or another subscription.File Converter for iPhoneMove a file into the format the next app, person or workflow actually needs.