Coffee Bean Freshness Decay Calculator
Track coffee bean freshness from roast date and storage.
Calculate flavor peak, decay curve, and shelf life for whole bean and ground coffee under any storage.
Days Past Peak Freshness
Coffee Bean Freshness Decay
Roasted coffee follows a freshness curve: an early degas phase (CO2 still escaping), a peak window (best flavor), and gradual decay.
Standard freshness timeline (whole bean, sealed bag with valve):
| Day Range | Phase | Flavor State |
|---|---|---|
| 0-3 days | Degas | Too gassy, blooms but weak crema/extraction |
| 4-7 days | Approaching peak | Coming into focus |
| 7-21 days | Peak window | Best balance — sweet, bright, complex |
| 21-35 days | Late peak | Still good — softer acidity |
| 35-60 days | Declining | Loses brightness, mutes |
| 60+ days | Stale | Cardboard, papery — usable for milk drinks |
Storage condition multipliers (extends or shortens decay):
| Storage | Multiplier |
|---|---|
| Sealed valve bag, cool dark cupboard | 1.0× (baseline) |
| Airtight canister (Airscape, Atmos) | 0.85× — extends 15% |
| Vacuum sealed | 0.7× — extends 30% |
| Frozen, vacuum sealed | 0.4× — extends 2.5× |
| Open bag, room temp | 1.5× — degrades 50% faster |
| Open jar, sunny counter | 2.0× — degrades 2× faster |
Ground coffee decays MUCH faster:
- Whole bean shelf life: ~30 days at peak
- Ground coffee shelf life: 3-7 days at peak
- Surface area exposure to oxygen is the killer
- Industry rule: never grind more than you’ll use within an hour
Light/medium vs dark roasts:
- Light roasts: longer degas (5-10 days), narrower peak (10-14 days), fast decay
- Medium roasts: standard 4-7 day degas, 14-21 day peak
- Dark roasts: short degas (2-4 days), wider peak (10-30 days), slower decay due to oils sealing surface
Espresso vs filter:
- Espresso wants slightly older beans (10-25 days post-roast) for thicker crema and balanced extraction
- Filter coffee shines fresher (7-21 days) for full aromatic complexity
Signs your beans are stale:
- Weak bloom (less than 1.5× volume increase)
- Flat, papery taste in cup
- No oily sheen on dark roasts
- Loose surface oils (rancid notes)
Pro tip — freezer storage works: Vacuum sealing whole beans and freezing right after roast keeps them peak-fresh for 6+ months. Pull from freezer 30 minutes before brewing — never grind frozen beans.