Leaf Sheet Coverage Calculator
Enter the area you’re gilding, the sheet size, and a waste allowance to get the sheets — and whole books — you need to buy.
Sheets & books needed
The coverage math
The calculation is simple division dressed up with two real-world corrections. First, the surface area is inflated by the waste percentage to cover overlap and breakage. Second, that inflated area is divided by the area of one sheet, then rounded up, since a fraction of a sheet still costs you a whole one. Finally, the sheet count is divided by how many sheets come in a book — again rounded up, because leaf is sold whole.
Small, fiddly, or heavily moulded surfaces eat more leaf than their flat area suggests, so lean toward a higher waste allowance on ornate carving, gilded lettering, or anything with a lot of edges. A large, flat panel is the most efficient shape to gild.
Frequently Asked Questions
Why do I need a waste allowance at all?
Every sheet of leaf laid overlaps the last one slightly (a "skewing" or "lap") so there's no gap at the seam, and a share of loose leaf tears or drifts off the work before it lands. That overlap and loss adds real area on top of the surface's exact measurement, which is what the waste percentage accounts for.
How much waste should I actually enter?
15–20% is a reasonable starting point for water gilding with loose leaf on a moulded or carved surface, where overlap and breakage are highest. A flat panel gilded with patent (transfer) leaf by a practiced hand can often get away with 10% or less. When in doubt, round up — buying one extra book is cheaper than running short mid-project.
What's the standard sheet size?
Genuine gold leaf is conventionally sold as 3-3/8in (3.375in) square sheets, packaged 25 to a book. Composition (imitation) leaf is often sold in larger sheets, commonly around 5-1/2in square, since it's cheaper to produce at scale. Always check your specific product's sheet size — it varies by manufacturer.
Does this work for silver or composition leaf too?
Yes — the coverage math only depends on the sheet's area and the surface you're covering, not the metal. Just set the sheet size to match whatever leaf you're actually using and enter the books-per-book packaging your supplier uses if it isn't 25.
Educational tool only. Results are estimates for planning purposes — always buy a little extra and test your technique on a scrap piece before a finished project.