How to Allocate Extra Blank Shirts by Size and Color
Extra blanks only help if they match the garments that need replacing. Plan important size and color groups separately when stock cannot be substituted.
Start with the finished size and color breakdown
An order of 100 shirts might contain 20 small, 50 medium, and 30 large shirts. Five extra shirts in one size do not protect every possible replacement need. Keep a separate row for each group that cannot be substituted, including garment color and style where relevant.
This does not mean every group needs the same extra-stock policy. It means the policy should be deliberate, particularly when a replacement garment is difficult to obtain after the run starts.
Rounding each group changes the purchase total
With a 5% extra-stock allowance applied to the whole order, 100 × 1.05 = 105 blanks. Applied to the three groups and rounded up separately, the results are 21 small, 53 medium, and 32 large: 106 blanks.
The extra unit is not a calculation error. Rounding is applied three times instead of once. If you want exactly five extras, you must choose their distribution rather than treating three independently rounded percentages as a fixed total.
A reject-rate model uses another denominator
For a 10% expected reject rate, the same groups require ceiling(20 ÷ 0.90) = 23, ceiling(50 ÷ 0.90) = 56, and ceiling(30 ÷ 0.90) = 34. The total is 113, while a single combined calculation gives 112.
Use the blank allowance calculator for each group and preserve the chosen mode. These are expected-yield calculations, not probability guarantees that every group will finish with sufficient usable shirts.
Price extras with their actual group costs
If sizes or styles cost different amounts, multiply each purchase quantity by that group’s price. Do not apply a low-cost group’s unit price to all extras. The mixed-garment costing guide shows how to calculate the weighted total without losing those differences.
Unused extras can remain inventory. If the quote budgets their entire purchase cost, keep that convention clear when comparing estimated job cost with actual consumption.
Check practical replacement limits
Confirm whether extras can be sourced, whether customer-supplied pieces can be replaced, and whether substitutions are acceptable before promising a finished quantity. Do not automatically promise replacement terms based on this calculator. The customer-supplied garment guide addresses the separate estimating questions for those jobs.
After the run, record rejects by group and cause. A combined percentage can hide a recurring issue in one particular garment type.
A size-level purchase check
Copy these fields into the record for your next comparable job.
- Each non-substitutable group
- Record style, color, size, finished quantity, chosen allowance mode, and rounded purchase quantity.
- Order total
- Sum the rounded group quantities; do not expect them to equal a single rounded whole-order percentage.
- After the run
- Record usable surplus and rejects by group. A spare in one size cannot necessarily replace a reject in another.
Put this into practice
Open the waste allowance calculator with your own job values.
AI-assisted educational content. Examples are illustrative; arithmetic is checked against the stated methods. This is not a field-tested production specification. Read our editorial policy.
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