Mould volume
Use the filled mould volume and your base supplier’s density.
- The example density is not a product specification. This tool plans melt-and-pour base only; it does not calculate lye or a cold-process soap formula.
Crafts calculator
Soap Base Calculator
Estimate melt-and-pour soap base from mould capacity or measured weight per bar.
Method and practical checks
- The example density is not a product specification. This tool plans melt-and-pour base only; it does not calculate lye or a cold-process soap formula.
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Every calculation option
Measured bar weight
Use a known base weight from a test pour.
- Use the base mass before additives. Product-specific additive limits and handling instructions take precedence.
Worked example
Twelve 100 ml moulds at 1 g per ml need 1,200 g of melt-and-pour base, or 1,320 g with a 10% allowance: 2 blocks of 1 kg.
| Input | Value |
|---|---|
| Soap bars | 12 |
| Mould fill per bar | 100 ml |
| Base density from supplier | 1 g/ml |
| Extra allowance | 10 % |
| Pack size | 1,000 g |
| Result | Value |
|---|---|
| Required quantity | 1,320 g |
| Packs to buy | 2 |
| Purchase quantity | 2,000 g |
| Left over | 680 g |
Reading the result
- This plans melt-and-pour base only; it does not calculate lye for cold-process soap.
- Additives such as exfoliants take up space; weigh a test bar if you use them.
- Follow the base supplier’s maximum fragrance and colour percentages.