Every calculator listed here is free to embed on your own site. Paste the code snippet into any page — no sign-up, no fees, no expiry. The calculator runs from our servers so there's nothing to maintain on your end. If you find it useful, a link back is appreciated but not required.
BTU calculator
Calculate the BTU and kW heating output needed for any room. Enter dimensions, insulation quality, external walls, floor type, and number of radiators.
Paint calculator
Calculate how much paint you need for a room. Enter dimensions, paint type, and number of coats — deduct doors and windows for an accurate result.
Tile calculator
Calculate how many tiles you need for a floor or wall. Enter room dimensions or area, tile size, and wastage percentage to get tiles and boxes needed.
VAT calculator
Add or remove VAT from any amount. UK rates: 20%, 5%, and 0%.
EV charging calculator (UK)
Calculate EV charging cost, range and charge time for your electric car.