MetraNestMeasure the project area
For a rectangle, simply multiply length by width. Divide more complex areas into measurable shapes without counting their intersections twice. Keep a sketch of edges and obstacles: two equal areas can produce very different offcuts. The result shown here covers the rectangular area entered.
Use the supplier’s size
One roll does not necessarily cover one square metre. Copy the stated area for the product you are ordering. If it is sold in packs, you can enter the area of a pack, provided you then read the resulting count as order units. Keep this convention on your project sheet.
Separate reserve from rounding
The allowance is applied to the area before converting it to rolls. The last roll may increase the purchased quantity further. This total reserve is shown in the results. A percentage does not guarantee that all offcuts will be reusable, especially around curves and narrow passages. Check the sketch before finalising the order.
Area required = measured area × (1 + allowance ÷ 100). Rolls = this area ÷ area covered per roll, rounded up.
A 24 m² rectangle
With a chosen reserve of 5%, the target reaches 25.2 m². If each roll covers 1 m², you need twenty-six rolls. The purchased quantity exceeds the ground area by 2 m², partly because of rounding.
Details to check
- Check the exact size being ordered.
- Sketch the edges before choosing the reserve.
- Distinguish individual rolls from packs sold together.
Frequently asked questions
Is the result an installation plan?
No. It estimates an order quantity by area. Joint positions and offcut reuse require a separate sketch.
Is the 5% allowance mandatory?
No. It is an assumption in the example. Adapt it to the shape of the area and the supplier’s advice.
Method and references · Editorial review: 25 October 2026
The geometric formulas are explained here. For a product, its packaging dimensions and coverage rate remain the reference inputs.