Calculate how many washes a shampoo bottle gives you.
Bottle size divided by the per-wash amount gives the total washes, then that feeds a time estimate. Most people use far more shampoo than needed, so seeing the wash count encourages a right-sized squeeze.
Shampoo Usage
Washes = size / amount per wash
Washes = size / amount per wash Bottle size divided by the per-wash amount gives the total washes, then that feeds a time estimate.
Most people use far more shampoo than needed, so seeing the wash count encourages a right-sized squeeze.
This calculator takes 3 inputs: Bottle size, Per wash, Washes per week. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.