Razor Blade Replacement Calculator

Razor Blade Replacement Calculator: Avoid Shaving With a Dull Blade

A dulling razor blade causes irritation, nicks, and a worse shave overall, and it's easy to lose track of how many shaves a blade has actually seen. This calculator estimates your replacement schedule from a recommended shaves-per-blade figure and your shaving frequency.

The Formula

Weeks Until Replacement = Recommended Shaves per Blade / Shaves per Week

Worked Example

A blade rated for 8 shaves, shaving 3 times a week.

Weeks Until Replacement = 8 / 3 = 2.67 weeks

How to Use This Calculator

1. Optionally adjust the recommended shaves per blade (8 is a common default).
2. Enter how many times you shave per week.
3. Click Calculate to get your blade replacement interval.

Related Calculations

Use with the Skincare Routine Time Calculator for a broader grooming routine plan.