How do I budget backing and borders for several display boards?

Measure the part you will actually cover

Use the width and height of the rectangular area receiving backing and border, in centimetres. Decide whether an existing frame stays visible and measure the covered area accordingly. Count how many boards share these exact dimensions. The multi-board tool assumes they are identical; if your boards differ, calculate each size as a separate group and add the results. Record the measurements before entering prices. Reusing a rough room label such as a large board without measuring it makes the later decimal places look more certain than the inputs are.

Worked example: three matching boards

Suppose three boards each measure 120 by 120 cm. Each board needs 1.2 × 1.2 = 1.44 square metres of backing and 2 × (1.2 + 1.2) = 4.8 metres of border before allowance. Three boards therefore need 4.32 square metres and 14.4 metres. A 10% allowance multiplies each quantity by 1.10, giving 4.752 square metres of backing and 15.84 metres of border. At your entered prices of £2 per square metre for backing and £0.50 per metre for border, the arithmetic estimate is £9.504 plus £7.92, or £17.424 before rounding. Those rates are example inputs, not supplier quotations. The currency total displayed by the calculator is rounded for reading.

Check what a supplier actually sells

A square-metre total does not tell you how many whole rolls to buy. Check the roll width, length and usable area, and whether a sheet can cover the board in the orientation you need. Seams, offcuts and patterned paper can affect what remains usable. Border may be sold in fixed-length packs, and joins or overlaps use some length. Round up to the purchase unit only after checking its specification. Delivery charges, tax treatment and other materials are outside this calculator unless you account for them separately. Reusable stock should be checked before you assume it can replace a new pack.

Make the estimate useful next time

Give the saved result a title that identifies the board size, board count and occasion. Keep the stated waste percentage and price basis with the inputs. When you prepare another display, reopen the result, update the measurements or rates and inspect the calculation again. A previous downloaded PDF will not update when you edit a saved result. Keep the old estimate if you want to compare it with the real material use after installation. That comparison is more useful than repeatedly choosing an allowance without recording why. Use the inventory balance tool when you also need to compare quantities required with stock already available.

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