GIFSQ Tools · Module 18 — Manufacturing, Costing & Supply Chain · Tool 342 of 500
Total up a bill of materials for a production run: enter the quantity of each component needed per finished unit, the number of units to make, and a waste allowance — the tool totals the material to order and flags the largest component.
Try sample values — fills the form with the worked example below.
–
Total material to order (kg)
–
Largest component total (kg)
–
Components
Equation: Total per component = quantity per unit × units × (1 + waste ÷ 100). Total material = sum of the component totals. Largest component = the biggest single component total.
Method: Bill-of-materials explosion: multiply the per-unit recipe by the run size, then add the waste allowance (trim, spillage, start-up loss) so the order covers the real usage. The largest component is the one to check first when stock is tight.
Assumptions: every component uses the same waste allowance; the per-unit quantities are exact and the recipe does not change during the run; all components share the same unit.
Limitations: the tool does not check stock on hand, pack sizes or minimum order quantities — use Tool 343 for the net requirement after stock; different components may need different waste allowances in practice.
Rounding: totals to 2 decimal places; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Method: Bill-of-materials explosion: multiply the per-unit recipe by the run size, then add the waste allowance (trim, spillage, start-up loss) so the order covers the real usage. The largest component is the one to check first when stock is tight.
Assumptions: every component uses the same waste allowance; the per-unit quantities are exact and the recipe does not change during the run; all components share the same unit.
Limitations: the tool does not check stock on hand, pack sizes or minimum order quantities — use Tool 343 for the net requirement after stock; different components may need different waste allowances in practice.
Rounding: totals to 2 decimal places; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Worked example: Components 2, 0.5 and 1 kg per unit, 100 units, 5% waste: total = 3.5 × 100 × 1.05 = 367.50 kg; largest component = 2 × 100 × 1.05 = 210.00 kg across 3 components.
Enter values above to see results.
Keep the recipe in one unit (kilograms here) — mixing grams and kilograms in the list is the most common mistake. Tool 342 of 500 — GIFSQ
