Expiration Date Calculator
Add a shelf life to a start date and see the expiration date, reminder date, and days remaining.
Useful for food labels, cosmetics, medicines, storage planning, and product inventory checks.
Result
--
Run the calculation to see the expiry date.
| Metric | Value |
|---|---|
| Start date | -- |
| Expiration date | -- |
| Reminder date | -- |
| Days until expiration | -- |
Quick Answer
Add the shelf life to the start date to get the expiration date. The calculator also gives you a reminder date before expiry.
How to Calculate
- Enter the product start date.
- Enter the shelf life and choose the unit.
- Choose how many days before expiry you want a reminder.
- Click Calculate.
Formula
Expiration date = start date + shelf life
Reminder date = expiration date - reminder days
Worked Examples
Example 1: A 12-month shelf life starting on January 1 lands on January 1 next year.
Example 2: A 30-day shelf life starting on May 1 ends on May 31.
Example 3: A 7-day reminder before expiry helps with stock rotation and restocking.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Expiration date | The day the shelf life ends. | Use it for labels and inventory checks. |
| Reminder date | When to start preparing for expiry. | Great for planning stock rotation. |
| Days until expiration | How much time is left from today. | Use it to see whether the product is still valid. |
Frequently Asked Questions
Yes. Use the opening date as the start date if the shelf life begins after opening.
Yes. The calculator uses calendar-aware month and year addition.
You can use it to estimate dates, but always follow the official label or manufacturer instructions.
Related Calculators
References
- OmniCalculator reference page
- Calendar math is used for months and years, not just a fixed day count.
- Last reviewed: March 2026.