How do I know my yield?

Yield is the area of the pieces you cut divided by the area of the sheets you bought for them. The cutting optimiser gives it for every job: run a few real jobs and use the figure it gives.

How much glass does a shop throw away?

It depends on its jobs, so this page asks for the figures. As an example, 20 DLF sheets a month at 70 % yield are 520 m² thrown away a year, €14,561 at €28 per m².

Do offcuts on the rack count as waste?

Here, yes, until they are used: the page counts as thrown away all the glass bought that does not end up in pieces. If you reuse offcuts, type a higher yield.

Why does the page not promise a saving?

Because it depends on your jobs: their sizes, the glass types and how many offcuts you reuse. The page only does the sum with your figures.

Glass · Cutting

How much glass do you throw away?

A shop that buys 20 DLF sheets (3210 × 2250 mm) a month and gets 70 % of them into pieces throws away about 520 m² of glass a year: at €28 per m², €14,561. Type your own sheets, yield and price; the page does the sum and shows what a yield of your choosing would change. It promises no saving: what your own jobs give is what the cutting optimiser shows.

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Bought a year

— m²

Thrown away a year

— m²

What it costs a year

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At the yield compared

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Share the result

The link carries your figures after the #, which never reaches a server; nothing is sent until you choose a chat in WhatsApp.

How it is worked out

sheet area A = width × height / 1 000 000 m² bought a year B = sheets a month × 12 × A thrown away T = B × (1 − yield) its cost: T × price per m² at a yield b the same pieces need B × yield / b B × (1 − yield / b) m² less sheets less sheets a month × 12 × (1 − yield / b)

For the example: a DLF sheet is 3.21 × 2.25 = 7.2225 m², and 20 a month are 240 sheets, 1,733.4 m² a year. At 70 % yield, 30 % is thrown away: 520.02 m², which at €28 per m² is €14,560.56. The same pieces at 80 % need 1,733.4 × 70 / 80 = 1,516.725 m²: 216.675 m² less, €6,066.90 and 30 sheets a year.

What this page does not tell you

Your yield. The page uses the figure you type; the cutting optimiser gives the real one for each job.
Any saving. The yield to compare with is yours to choose; what your jobs reach depends on their sizes, glass types and the offcuts you reuse.
The cost of cutting, handling or the skip. Only the glass is counted.
Offcuts kept on the rack. They count as thrown away until they are used: if you reuse them, raise your yield.

Questions people ask

How do I know my yield?: Yield is the area of the pieces you cut divided by the area of the sheets you bought for them. The cutting optimiser gives it for every job: run a few real jobs and use the figure it gives.
How much glass does a shop throw away?: It depends on its jobs, so this page asks for the figures. As an example, 20 DLF sheets a month at 70 % yield are 520 m² thrown away a year, €14,561 at €28 per m².
Do offcuts on the rack count as waste?: Here, yes, until they are used: the page counts as thrown away all the glass bought that does not end up in pieces. If you reuse offcuts, type a higher yield.
Why does the page not promise a saving?: Because it depends on your jobs: their sizes, the glass types and how many offcuts you reuse. The page only does the sum with your figures.