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Lambing Date Calculator
Enter your tupping date to calculate the expected lambing date, pregnancy scanning window, housing date, and full pre-lambing management timeline for your flock.
🐑 147-day gestation
📅 Full timeline
🏴 UK farming calendar
⚡ Instant results
Lambing Calculator
Calculate your lambing dates and management windows
Tupping Details
Date the ram was put in with the ewes
days
Average is 147 days (range: 144–152 depending on breed)
Selects typical gestation for your breed
Flock Details
ewes
Total ewes put to the ram
%
Lambs born per 100 ewes (UK average 150–200%)
Additional Options
Lambing Summary
Your flock management calendar
Enter your tupping date, breed, and flock details, then click Calculate lambing dates to see your full management timeline.