Private browser-based planner
Contact lens inventory reminder calculator
Count unopened lenses for each eye, apply your own prescribed interval when needed, and estimate when to reorder. The planner does not upload your entries or choose a medical replacement schedule.
Your inventory
Count unopened lenses for each eye. Everything is calculated in your browser and nothing is uploaded.
Enter lenses, not boxes. The estimate uses the smaller count so it does not treat one eye's extra inventory as a complete set.
Use 7 for daily wear or your planned weekly frequency.
Choose enough time for prescription verification and delivery.
Your inventory plan
Enter valid per-eye counts to see an estimate.
What the planner calculates
This is an inventory estimate, not a fit or treatment recommendation. Its most important safeguard is simple: left-eye and right-eye lenses are counted independently, and the smaller count limits the estimate.
| Input | What you provide | How it is used |
|---|---|---|
| Daily disposable lenses | Enter the unopened lens count for each eye and the number of days you expect to wear lenses each week. | The estimate uses the smaller eye-specific count because one left or right lens alone is not a complete wear set. |
| Reusable lenses | Enter the exact replacement interval from your prescription, product labeling, or eye-care professional. | The tool applies the interval you enter. It does not infer a schedule from a label such as monthly or biweekly. |
| Reorder lead time | Choose enough time for prescription verification, ordering, and delivery. | The reorder date is the estimated inventory boundary minus your selected lead time. |
Read the dates as inventory boundaries
The estimated inventory date is when the entered left and right counts no longer support another matched wear set under the inputs you supplied. The reorder date simply subtracts your selected lead time from that estimate.
For reusable lenses, the calculation includes the current pair and applies only the interval you enter. If your instructions change, update the input. The tool never assumes that a familiar marketing label determines the right interval for a particular wearer.
Calendar reminders repeat the estimate you created. They do not verify your prescription, retailer timing, remaining inventory, or suitability for continued lens wear.
Five inventory mistakes this tool avoids
Counting boxes instead of lenses
A box or order history may describe one eye's supply. Count actual unopened left-eye and right-eye lenses separately so the estimate does not turn one quantity into fictional two-eye pairs.
Assuming both eyes have equal inventory
Count each eye separately. The planner uses the smaller count and shows both values so an imbalance is visible.
Letting a tool choose a medical schedule
For reusable lenses, enter the interval your eye-care professional and product instructions specify. Do not use a generic schedule from a website.
Using a short reorder buffer by default
Choose a lead time that reflects prescription verification and delivery. The planner does not predict a retailer's timing.
Using an organizer for removed lenses
Sturdysight is only for unopened daily-disposable blister packs. It never stores bare lenses, worn lenses, or solution.
Frequently asked questions
How does this contact lens inventory calculator work?
Enter unopened lens counts for your left and right eyes. Daily-disposable wearers also enter expected wear days per week. Reusable-lens wearers enter their prescribed replacement interval. The tool uses the smaller per-eye count to estimate an inventory boundary and subtracts your chosen reorder lead time.
Why does the calculator ask for left and right counts separately?
Contact lenses are commonly packaged and prescribed by eye. A box labeled 90 contains 90 individual lenses, not 45 two-eye pairs. Separate counts prevent extra inventory for one eye from being treated as a complete set.
Where should I get a reusable-lens replacement interval?
Use the interval on your prescription and product labeling or the instructions from your eye-care professional. This planner will not select or extend that interval.
Does part-time wear change a daily-disposable inventory estimate?
Yes. The planner spreads unopened single-use lenses across the number of wear days you enter. It remains an estimate because it does not know the exact weekdays you will wear lenses.
Does part-time wear extend a reusable lens interval?
This tool does not make that decision. It always applies the prescribed interval you enter. Ask your eye-care professional if you are unsure how your instructions apply.
Can the calculator add reminders to my calendar?
Yes. It creates a local calendar file for the calculated reorder and inventory dates. Your entries stay in your browser and are not uploaded.
Can Sturdysight store reusable lenses?
No. Sturdysight organizers only hold unopened daily-disposable blister packs. Removed reusable lenses require the case supplied or specified by the prescribed care system.
Is this calculator medical advice?
No. It is an inventory-planning aid. Verify your counts and follow your prescription, product labeling, and eye-care professional's instructions.
Continue your inventory routine
Primary safety references
Review the FDA contact lens solutions and products guidance and the CDC contact lens wear and care overview. For personal replacement instructions, use your prescription, product labeling, and eye-care professional.