Carton Fill Calculator
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Fill % = (product volume × quantity) ÷ carton volume — check how efficiently units pack into a master carton.
Product & carton
Carton fill rate
12.5%
1,000 in³ of product in 8,000 in³ carton
- Fill rate
- 12.5%
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Optimizing carton utilization
Carton fill rate measures how much of a shipping box's total volume is actually used by the product units packed inside — calculated as total product volume divided by carton volume, expressed as a percentage. A low fill rate wastes freight space and can mean paying dimensional weight charges for mostly empty air.
Most operations target 80% or higher carton utilization for cost efficiency, though fragile or irregularly shaped products may need extra padding that lowers achievable fill rate. Comparing several carton sizes against your product's dimensions can reveal a better-fitting box that reduces wasted volume and shipping cost.
Example: packing 8 units of a 5 × 5 × 5 in product (125 in³ each, 1,000 in³ total) into a 20 × 20 × 20 in carton (8,000 in³) gives a fill rate of 12.5% (1,000 ÷ 8,000) — a sign the carton is too large for this quantity.
Common questions
What is a good carton fill percentage?
80% or higher is a common efficiency target for standard products. Fragile items needing extra cushioning may run lower — the right number depends on your product and protection needs.
Why does low carton fill matter for cost?
Underfilled cartons often trigger dimensional weight charges based on the carton's full size, even though the actual product weight is low — you effectively pay to ship empty space.