Paste it in. Know if it's right.

Free checkers for the codes and numbers on everyday paperwork. Fast, free and private: nothing you type is stored.

Tools

• IBAN checkerCheck a bank account number for 105 countries.
• VIN lookupSee the make, model, year and engine of any vehicle.
• Tax code checkerWhat your UK tax code means and if it looks wrong.
• UCAS points calculatorAdd up UCAS tariff points for A levels, BTECs and more.
• NPI lookupFind a US healthcare provider's NPI by number, name or organisation.
• Tire size calculatorCompare two tire sizes and see your speedometer difference.
• Credit card validatorCheck a card number is correctly formed and see its network.
• Concrete calculatorCubic yards and bags of concrete for slabs and post holes.
• Board foot calculatorBoard feet and cost for one board or a stack of lumber.
• Gravel calculatorCubic yards and tons of gravel, stone or sand for any area.
• BTU calculatorThe air conditioner size your room needs (ENERGY STAR chart).
• Roof pitch calculatorPitch, angle and slope, plus roof area and roofing squares.
• Cubic yard calculatorCubic yards, feet and metres from any mix of units.
• Paint calculatorHow many gallons of paint your room needs.
• Stair calculatorSteps, riser height, run and stringer, checked against code.
• Final grade calculatorThe score you need on your final to get the grade you want.
• Date calculatorDays between dates, working days, and adding or subtracting dates.
• Ring size chartConvert US, UK and European ring sizes, or size from mm.
• Watts to ampsConvert watts to amps for DC, AC and three-phase.
• Amps to wattsConvert amps to watts for DC, AC and three-phase.
• Rafter calculatorRafter length, rise, cut angles and the board to buy.
• Fence calculatorPosts, rails, boards, concrete and cost for a wood fence.
• Deck calculatorDeck boards, joists and screws for a rectangular deck.
• Siding calculatorWall area, squares and boxes of siding for your house.