Razor Blade Replacement Calculator
Estimate how often to replace your razor blade or cartridge based on shaving frequency, hair type, and blade care habits.
Result
Under typical conditions, replace your razor blade about every 1–2 weeks.
Use the inputs below to tailor this estimate for your shaving frequency, hair type, razor, and blade care.
- Daily shaving wears blades down fastest — expect weekly replacements.
- Coarse or thick hair dulls edges faster than fine hair.
- Rinsing and drying your blade after each shave extends its life.
- Larger shaving areas (face + body) put more wear on each blade.
Recommended replacements
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Inputs
What this calculator does
This calculator estimates how often you should replace your razor blade or cartridge based on shaving frequency, hair coarseness, shaving area, razor type, and blade care habits.
When you should use it
- You want a replacement schedule instead of guessing when your blade is dull
- You're getting nicks, irritation, or tugging that suggests a worn blade
- You want to budget for razor cartridge costs over time
How the estimate works
- Starts from a baseline of about 10 days between replacements (roughly 5-7 shaves)
- Adjusts the interval based on how often you shave and what you're shaving
- Accounts for hair thickness, razor blade count, and whether you maintain the blade between shaves
Assumptions & limits
- Assumes standard shaving with cream or gel — dry shaving will dull blades faster
- Does not account for electric razors or straight razors
- A blade that tugs, pulls, or causes irritation should be replaced regardless of the estimate
FAQ
How many shaves can you get from a razor blade?
Most cartridge razors last 5-7 shaves under typical conditions. Five-blade cartridges tend to last closer to 15-20 shaves, while disposable razors may only last 3-5. Hair coarseness, shaving area, and blade care all affect the count.
Does rinsing and drying the blade really help?
Yes. Rinsing removes hair and debris that dull the edge, and drying prevents oxidation and micro-corrosion. Together these habits can extend blade life by several shaves.
How can I tell when a razor blade is dull?
Signs include tugging or pulling at hair instead of cutting cleanly, increased skin irritation or razor burn, needing multiple passes over the same area, and visible nicks or rough spots on the blade edge.
Are expensive cartridges worth it over disposable razors?
Multi-blade cartridges (3-5 blades) generally last longer per unit and give a closer shave, but cost more upfront. Disposables are cheaper per razor but need replacing more often. Safety razors offer the lowest cost per shave long-term.
Built because someone forgot to replace their filter again. 🦆