Estimate how long a wellness membership product supply can support the benefits promised to active members. Enter current inventory, product used for one included service, active members, included uses per member each month, expected participation, and product waste. The calculator converts membership obligations into monthly product demand, supported services, and estimated months of coverage. Use it for inventory planning while respecting manufacturer storage and expiration instructions.
Enter current inventory, product per included use, active members, monthly included uses, expected participation, and waste.
Coverage shows how long current usable inventory can satisfy forecast membership benefit redemptions.
This estimate excludes non-member use and does not override manufacturer storage or expiration instructions.
With 2,000 mL in inventory and 5% waste, 1,900 mL remains usable. For 100 members with one monthly use at 80% participation, 80 services use 400 mL per month. Coverage is 4.75 months, or about 144 days.
The calculator multiplies included uses by the expected participation rate, so lower redemption reduces forecast monthly product demand.
Use 100% participation for a conservative maximum-demand scenario, then compare it with observed participation.
Yes. Use the same unit for inventory and product per included use.
No. Compare calculated coverage with manufacturer expiration, storage, and period-after-opening instructions.
Subtract non-member demand from available inventory first or include that demand in a separate inventory forecast.
| Duration | Planning signal |
|---|---|
| Under 1 week | Urgent or high-frequency replenishment |
| 1–4 weeks | Frequent stock review |
| Over 4 weeks | Routine inventory review |