Cosmetic Formula Percentage Calculator

Work out cosmetic formula percentage instantly with clear inputs, formula shown and shareable results.

About Cosmetic Formula Percentage Calculator

Cosmetic formulas are written as percentages by weight that must total exactly 100%, with water adjusted to bring the total to 100. Phases are weighed separately: the water phase and oil phase are heated and emulsified, and heat-sensitive actives, preservatives and fragrance are added in the cool-down phase below 40 C.

Formula

Phase quantities

Phase mass = batch size x phase percentage / 100; water is adjusted so all percentages total 100

Worked example

With the default values below, Cosmetic Formula Percentage Calculator returns Water Phase Mass of 700.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Batch Sizeminimum 0 g: 1,000 g
Water Phaseaccepts 0–100 %: 70 %
Oil Phaseaccepts 0–100 %: 22 %
Cool-Down Phaseaccepts 0–100 %: 5 %

Results

Water Phase Mass: 700.000
Oil Phase Mass: 220.000
Cool-Down Phase Mass: 50.000
Unallocated Percentage: 3.000%

Step by step

1Values used
2Phase quantities
3Water Phase Mass= 700.000
4Oil Phase Mass= 220.000
5Cool-Down Phase Mass= 50.000
6Unallocated Percentage= 3.000

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Cosmetic formulations require safety assessment and preservative efficacy testing before sale. Ingredient concentration limits are set by cosmetic regulation.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Cosmetic formulations require safety assessment and preservative efficacy testing before sale. Ingredient concentration limits are set by cosmetic regulation.

Frequently Asked Questions

Why must the total be exactly 100%?

Because percentages are the formula's definition. If they do not total 100, the actual concentration of every ingredient is different from what is written, which breaks reproducibility and regulatory documentation.

Why add preservative in the cool-down phase?

Many preservatives degrade above 40-50 C, and fragrance and volatile actives evaporate. Adding them hot reduces or destroys their function.