🧴 Shampoo Usage Calculator

Estimate how long a shampoo bottle will last.

Bottle size (mL)

Amount per wash (mL)

Washes per week

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How to use this calculator

Estimate how long a shampoo bottle will last. Enter the values above and select Calculate. Results are estimates and may vary in real-world use.

This calculator combines the entered values using the relationship described by the field labels.