When calculating tile quantities for a commercial fit-out, one determines the ceiling area in square metres, works out the coverage of individual tiles, and then adds a wastage allowance for perimeter cuts and breakages. For the standard size of tiles which are 595mm x 595mm, one tile covers approximately 0.354m², while a box of 16 tiles covers approximately 5.76m². If you get the area and waste margin correct, you will only need to order once, and if the fit is clean, you will also avoid the cost and delay of a second delivery during the job. This is the method used on commercial sites.
Step one: measure the ceiling area
To get the area of the floor (and the ceiling for a flat ceiling) measure the room in meters and multiply the length and width. For odd shaped rooms, divide the room into rectangles, calculate the area of each and sum them up. Do not deduct for columns or small fittings as those areas will still require cut tiles, and leave a buffer in the calculations, as those areas contribute to waste.
Step two: know your tile coverage
Coverage depends on tile size:
Due to differences in thickness and types of tiles, always check the box quantity on the product page because it may change.
Step three: do the calculation
Calculate the raw tile count by dividing the ceiling area by the coverage of one tile. For a 200m² office using 595mm tiles: 200 ÷ 0.354 =565 tiles. Then convert to boxes: 565 ÷ 16 = 35.3 boxes, so you would round up to 36 boxes.
Step four: add a waste allowance
Never order the exact calculated figure. Add a margin for:
A 5–10% allowance. Depending on the complexity of the layout, each room will suit a different allowance. For simple layouts with lots of columns, bulkheads, and angled walls, lean toward 10% or more, as the ratio of the area of cut tiles increases as the perimeter to area ratio increases. On our 200m² example, a 10% allowance takes 36 boxes up to about 40 boxes.
Step five: Remember the rest of the system
A tile order comprises only some of the components for a fit-out. If you are installing or extending a grid, you will also need main tees, cross tees and wall angles all cut to the same module. If the ceiling holds lights, you will also need to account for modular light fittings and any associated matching diffusers. Keeping your tile, grid and fitting orders with one supplier ensures modular consistency and helps you avoid compatibility issues, and for larger orders it is where the bulk pricing difference is the most significant.
Worked example summary
Frequently Asked Questions
How many 595mm ceiling tiles are in a square metre?
Each tile measuring 595mm x 595mm covers about 0.354m², meaning there are approximately 2.8 tiles per square metre. A typical box of tiles (which contains 16 tiles) covers about 5.76m².
How much waste should I allow?
When determining the perimeter cuts, breakages, and future spares, add an additional 5-10%. For more intricate layouts that include numerous columns and angled walls, allot towards the top end or greater.
Should I order extra tiles to have some on hand as spares?
Correct. If a later breakage occurs, not having to reorder product is especially useful if a product is rebranded or discontinued.
Do you offer discounts on large orders?
Yes. RCT provides discounts for bulk orders and we have a price guarantee (we will beat any genuine lower price). For fit-out quantities, please request a bulk quote.
Are you ready to place an order? Check stock and box quantities on our Suspended Ceiling Tiles category page.
For fit-out quantities, request a free bulk order quote or call 01939 251 450 – We will verify coverage, inspect inventory for next-day dispatch, and apply our bulk discount and price guarantee.
WhatsApp Scan to start a chat with us!