Wallpaper Calculator for homeowners and DIYers

For a homeowner, the wallpaper question is really two questions: how many rolls, and what will the order cost. The calculator answers the first; the second follows by multiplying rolls by the price of one roll. If a roll costs, say, ₹1,000 — replace that figure with your shop price — then 7 rolls cost ₹7,000, and 8 rolls with a spare cost ₹8,000. The arithmetic is simple, but only if the roll count is right, so the measuring step deserves the same care as the spending step.

Plan room by room, then the whole house

Work one room at a time. The room used throughout this set — 37.8 square metres of wall, minus a 1.9 square metre door and a 1.5 square metre window, giving 34.4 square metres — needs 34.4 ÷ 5 = 6.88, rounded up to 7 rolls at 5 square metres per roll, or 8 with a spare. A second room of 20 square metres needs 20 ÷ 5 = 4 rolls. Together, the two rooms need 34.4 + 20 = 54.4 square metres, which is 54.4 ÷ 5 = 10.88, rounded up to 11 rolls, or 12 with a spare. Ordering room by room and ordering for the house together give the same count here, but ordering together is safer when rooms share a pattern, because every roll must come from the same batch.

Order once, from one batch

Batch matters more than most first-time buyers expect. Rolls from different batches can differ slightly in colour, and the difference shows on a wall, not in the shop. Order all the rolls for a pattern at once, from one batch, and keep the batch number written down with the leftover roll. If the pattern repeat is large, add one extra roll beyond the calculated number, because each strip must start at the same point in the pattern and paper is wasted at every join. A spare roll kept in a dry cupboard costs little and saves a room: it covers a torn strip during hanging and any repair later, when the same batch may no longer be available.

Frequently asked questions

How do I budget for wallpaper?

Multiply the roll count by the price of one roll. 7 rolls at, say, ₹1,000 a roll cost ₹7,000; replace the price with your shop price.

Should I order all rooms together?

Yes, when they share a pattern. One order from one batch avoids colour differences between batches.

Why keep the batch number?

So any later roll can be matched to the same batch. A different batch can differ slightly in colour.