Free farm tool
Livestock withdrawal period calculator
A withdrawal period runs from the last treatment to the time an animal or its food products may enter the food supply. Enter the final treatment date and the exact whole-day interval from the label or veterinarian, then confirm the result against those directions before acting.
Last reviewed August 6, 2026
Calculate the calendar screening date
Enter both values to see a date.
Confirm before acting
Use the exact directions for the species, production class, route, dose, and final administration. If the label gives hours or milkings, if use was extra-label, if products were combined, or if treatment changed, this whole-day calculator is not enough. Confirm with the current label and the veterinarian who established the withdrawal time. A zero-day statement does not necessarily mean immediate release.