Shampoo calculator

How Much Shampoo Should You Use?

Use enough to clean the scalp and roots; hair length, thickness, and product formula all affect the amount.

Start with 3 ml for short, 5 ml for medium, or 7 ml for long hair, then edit the amount to match your routine.

How long will your shampoo last?

Choose a hair-length estimate, then adjust the dose if you know how much you actually use.

1Bottle amount

2Hair length and estimated amount

ml / wash

Starting estimate only. Hair thickness, lather, and product directions may change the amount.

3Washes per day

washes / day

4Days washed per week

days / week

Your estimate

Washes left

Months estimate

Restock timing

How Much Shampoo for Short, Medium, and Long Hair?

This calculator starts at about 3 ml for short hair, 5 ml for medium hair, and 7 ml for long hair. Each value is an estimate and remains editable.

How Long Does a Bottle of Shampoo Last?

Bottle size, amount per wash, washes per day, and wash days per week determine the number of full washes and the estimated run-out date.

Shampoo Questions

Should I follow the calculator or the product label?

Follow the product label when it gives a specific amount. Calculator presets are editable planning estimates.

Does the run-out date include a partial final use?

The date is an estimate based on the mathematical amount left, while the use count reports full uses.

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