About the Packing Efficiency Calculator
How well products fill a box: used volume vs box volume, void space and the filler needed.
Also known as: box fill rate, void fill calculator, product to box ratio, box-fill, product-to-box-ratio.
How to use this calculator
- Enter box volume (cm³), product volume (cm³), items per box.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Packing Efficiency formula
Efficiency = product volume ÷ box volume
Worked example
Using the values pre-filled in the calculator above:
- Box volume (cm³) = 24,000
- Product volume (cm³) = 6,500
- Items per box = 2
the calculator returns:
- Packing efficiency: 54.17%
- Void space: 11,000 cm³
- Void fill needed: 11 litres