Choose a calculation type
Fingertip-unit rule of thumb: 1 FTU ≈ 0.5 g, covers an area about twice the size of a flat adult hand.
Verify in-use discard period on current labeling (commonly 28-56 days depending on product) — this may limit days' supply independent of remaining units.
Enter up to 6 phases. Leave unused phases blank.
Result
Days' supply-Enter values and calculate.
Formula will appear here.
Related calculators
Calculation cautions
- Verify exact package size and product-specific conventions before submitting any claim.
- PRN and maximum-use estimates are not predictions of actual use.
- In-use discard periods (insulin, some ophthalmics/injectables) can limit usable days independent of remaining volume.
- This tool performs arithmetic; it does not determine clinical appropriateness.