About the Carton Calculator
How many units fit in a master carton and how many cartons an order needs, with carton weight.
Also known as: units per carton, master carton calculator, cases needed.
How to use this calculator
- Enter units per carton, units to ship, unit weight (kg), empty carton weight (kg).
- 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.
Formula
Cartons = ⌈units ÷ units per carton⌉
Worked example
Using the values pre-filled in the calculator above:
- Units per carton = 24
- Units to ship = 1,000
- Unit weight (kg) = 0.4
- Empty carton weight (kg) = 0.5
the calculator returns:
- Cartons needed: 42
- Units in last carton: 16
- Carton gross weight: 10.1 kg
- Total shipment weight: 421 kg