Estimate how long a retinol tube lasts and its monthly cost.
A retinol dosed a few nights a week lasts many weeks, and the tube price spread over that time gives a monthly cost. Retinol is usually applied on alternating nights to build tolerance, so knowing tube duration prevents over-ordering and waste.
Retinol Monthly Cost
Months per tube = (size / mL per use) / (uses per week x 4.35)
Months per tube = (size / mL per use) / (uses per week x 4.35) A retinol dosed a few nights a week lasts many weeks, and the tube price spread over that time gives a monthly cost.
Retinol is usually applied on alternating nights to build tolerance, so knowing tube duration prevents over-ordering and waste.
This calculator takes 4 inputs: Tube size, mL per use, Uses per week, Retinol price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.