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Industrial Math
10 min
Feb 15, 2026

Mastering the 'Tonnes Pivot' in Granite Accounting

I made a huge mistake early on in the development of DONOZ: I treated inventory as "Pieces." A factory owner corrected me: "Pieces are for counting. Tonnes are for costing." Granite is bought in Weight but sold in Area (SqFt). This creates a complex mathematical bridge that generic software fails to cross. ### The "Tonnes" Refactor We had to migrate the entire technical core to handle high-precision decimal weights. Every module—Purchase, Sawing, Sales—was rebuilt to handle the conversion from Weight to Area. ### Why it matters: Recovery Rates In the stone industry, we don't talk about "Efficiency." We talk about **Recovery**. Recovery is the % of a block that turns into sellable slabs. Anything else is waste. If your recovery drops from 75% to 70%, your profit margin vanishes. By mastering the "Tonnes Pivot," DONOZ automates this calculation instantly. The moment a sawing entry is finalized, we tell you exactly how much money you made per tonne.