Coffee Calculators
Grinder Burr Lifespan Calculator
https://www.coffeesizing.com/calculators/grinder-burr-lifespan/
Estimate only — not a cupping score, a water lab or a roast profile. Confirm on a test brew.
Grinder Burr Lifespan Calculator
Burrs wear. Manufacturers quote a kilogram life; you quote a daily dose. This splits remaining steel into days at your habit. Dull burrs make more fines, more channeling, and a grind size that ‘used to be espresso’ now pours like filter. Replace on taste and inspection, not only on this clock.
Inputs
Results
- Remaining life
- 450.0kg
- Days remaining
- 12,500days
- Life used
- 10.0%
The Result is indicative and educational. It does not constitute a design, a technical opinion or medical advice and does not replace calculations or verification by a person with the appropriate qualifications and authorisations. Before purchase, installation or use in practice – in particular in electrical installations – the Result should be verified by a qualified specialist. Details: Terms of Service, point 4.
Example products
Product links are Affiliate Links to Amazon websites. Using them does not cost you anything extra, and if you make a purchase we may receive a commission. Details: Terms of Service, point 5.
Comandante C40 MK4
Steel burrs with a known replacement path. Track kilograms if you grind espresso every morning.
Typical range: $250–$320
1Zpresso K-Ultra
Hand-grinder burrs still wear. Daily 36 g adds up faster than ‘it is only a hand mill’ suggests.
Typical range: $80–$250
0.1 g coffee scale
Logging dose is how kgUsed stops being a guess. Tare, grind, note, dump.
Typical range: $20–$80
Calculation method
Remaining kilograms are rated life minus what you have already ground, floored at zero. Days remaining divide that remainder by daily dose in kilograms (grams / 1000). Percent used is kilograms used over rated life. 50 kg into a 500 kg set is 10% used; at 36 g/day the remaining 450 kg last about 12 500 days (over 34 years) — the taste cliff often arrives earlier.
Exact formula
remainingKg = max(0, burrLifeKg − kgUsed). daysRemaining = remainingKg / (dailyDoseG / 1000). percentUsed = min(100, 100 × kgUsed / burrLifeKg). Limits: Bean hardness, roast level and unattended empty running omitted; rated life is marketing plus steel, not your espresso.
Seasoning is not lifespan
The first few kilograms knock sharp edges off. That is seasoning. Lifespan is the long, dull slide after that. Do not zero kgUsed after seasoning.
Frequently asked questions
Should I include wasted coffee?
Yes. Dial-in pucks still abrade burrs. Café life ratings assume throughput, not cups sold.
Titanium vs steel?
Coatings can last longer; the table on the box is still the input. When the coating is gone you have steel underneath, not magic.
Alignment versus wear?
A misaligned new burr set can taste ‘worn’. Check alignment and seasoning before you order replacements at 5% life.
More in this topic
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Compute extraction yield and brew ratio from refractometer TDS, basket dose and beverage mass. EY% = TDS% × yield / dose.
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Grind Size Converter
Convert grinder clicks between machines into estimated microns and whether that setting looks like espresso or filter. A map, not a laser diffraction lab.
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TDS Target Calculator
Work backwards from dose, beverage yield and a target extraction yield to the TDS your refractometer should read. Strength is not extraction.