The paint calculator subtracts doors and windows from the wall area to find the surface to be painted. It then works out how many cans you need at a typical 10-12 square meters per liter, and doubles the result automatically for a second coat. The electricity bill tool calculates monthly consumption in kWh from each appliance's wattage and daily use, then prices it at the current tariff, so you can see which appliance adds most to the bill.

The TV size calculator recommends the ideal screen size for your seating distance (using the rule of dividing viewing distance by roughly 1.5 to 2.5). The TV mount tool gives the mounting height that puts the center of the screen at eye level. The curtain size tool accounts for pleat allowance, which is typically 2 to 3 times the window width in fabric.

The lighting tool calculates lumen needs by room type: a home office needs around 300 lumens per square meter, while 100-150 is enough for a bedroom. Compare the result with the lumen figure on the bulb packaging when you shop.