Free calculators and tools
Every free tool on Braindumps, in one place. There is nothing to install and nothing to sign up for: they all work in your browser, on a phone or a computer. Several of them also give you the code to put the tool on your own website.
Cars and driving
Journey cost calculator
What a car journey costs in petrol, diesel or electricity, one way or return, and split between passengers, at current UK prices.
MOT history checker
Every MOT a car has had, from its number plate, with each advisory explained in plain English, the mileage readings checked and questions to ask a seller.
Electric car cost calculator
What an electric car would cost you for the miles your car really does, read from its MOT history, at home or public chargers, with the 3p-a-mile charge from April 2028.
EV charging subscription calculator
Whether a rapid charging subscription from IONITY, Tesla, bp pulse, GRIDSERVE, Shell, Fastned or Be.EV would save you money, for the charging you do each month.
Money
VAT calculator
Add VAT to a price or take it off, at 20%, 5% or any rate. It shows the price without VAT, the VAT and the total. For the maths behind it, read how to take VAT off a price.
3D printing
3D print cost calculator
The real cost of a print in the UK: filament, electricity, wear on the printer and failed prints, with the maths shown.
Home and kitchen
Celsius to Fahrenheit converter
Convert either way as you type, with the formula, full charts and UK oven gas marks.
Electronics
LED resistor calculator
The series resistor for an LED on 12 V, 5 V or any supply: pick the colour and current, and get the standard value to buy, the real current and the resistor’s power rating.
Capacitor code calculator
Read the code printed on a capacitor, such as 104, 473J or 2A104J, and get the value in pF, nF and µF with the tolerance and voltage. It also finds the code for a value.
Light the Lamp: logic gate game
A puzzle game that teaches logic gates: flick switches to light the lamps, from a single wire up to adders and memory, with the truth table of every gate.
Web and phones
QR code generator
Free QR codes for links, Wi-Fi, email, phone numbers and texts, as PNG or SVG files. The codes are static, so they never expire.
Retro computing and gaming
Controller tester
Test a PlayStation, Xbox, Switch or PC controller in your browser: every button, trigger and stick, a stick drift check with a plain answer, and the vibration motors.
Commodore 64 emulator
A working Commodore 64 in your browser, with BASIC, a library of programs, an on-screen keyboard and joysticks. To put one on your own website, follow how to embed a Commodore 64 emulator.
PAL NES games list
Every NES game released in the UK, Europe and Australia, with release years, PAL-A and PAL-B regions and product codes. Search and filter the list, and tick off the games you own.
PAL SNES games list
Every Super Nintendo game released in the UK, Europe and Australia, with PAL release years, publishers and product codes. Search and filter the list, and tick off the games you own.
New tools appear in the Tools section as they are added.