Shampoo Bar Calculator
Formulate a syndet shampoo bar by weight: set your batch size and the liquid surfactant, conditioner, butter and additive percentages, and solid SCI fills the balance. Calculates in your browser.
Recipe by weight
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Your percentages add up to more than 100%, reduce them.
Show the math
Each ingredient is a percentage of the batch; the solid surfactant (SCI) fills the rest:
grams = batch × percent ÷ 100 · SCI % = 100 − everything else
A syndet bar is built from cosmetic surfactants, not lye-based soap. Wear a dust mask when handling powdered SCI, follow each surfactant's usage guidance, and add a preservative if your bar will meet water in use. Patch-test before regular use.
What this does
A shampoo bar calculator formulates a syndet bar by weight: set batch size and the liquid surfactant, conditioner, butter, and additive percentages, and solid SCI fills the balance.
How to use it
- Enter the batch weight.
- Set each ingredient percentage.
- Let solid SCI fill the rest.
- Read every amount in grams.
How it works
A syndet bar is built from cosmetic surfactants, not lye-based soap. Wear a dust mask with powdered SCI and add a preservative if it will meet water.
grams = batch × percent ÷ 100; SCI % = 100 − rest
Understanding your result
A syndet bar is built from cosmetic surfactants rather than lye soap, so solid SCI fills whatever the liquid surfactant, conditioner, and butters leave. Wear a dust mask when handling powdered SCI, since the fine dust irritates the lungs, and add a preservative if the bar will sit in a wet shower, because repeated wetting invites microbial growth.
Example
A 100 g bar with 60% other ingredients leaves 40 g of SCI.
Sources & methodology
Last updated .
Frequently asked questions
Is this the same as a soap bar?
No \u2014 a syndet bar is built from cosmetic surfactants, not lye-based soap. Each ingredient is a percentage of the batch and the solid surfactant (SCI) fills the rest.
How are the amounts found?
grams = batch \u00d7 percent \u00f7 100, and SCI % = 100 \u2212 everything else.
Any safety notes for SCI?
Wear a dust mask when handling powdered SCI, follow each surfactant\u2019s usage guidance, and add a preservative if the bar will meet water in use. Patch-test before regular use.
Do you store anything?
No \u2014 every calculation runs locally in your browser.
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