Average Daily Gain Calculator for Lambs
Calculate the average daily gain (ADG) of lambs between two weigh-ins to track growth performance.
How this calculator works
ADG measures how fast an animal is growing per day. By subtracting the initial weight from the final weight and dividing by the days between, you find the daily average.
Formula used
ADG = (End Weight - Start Weight) ÷ Days
Example calculation
A lamb weighed 40 lbs on May 1st and 55 lbs on May 31st (30 days). Gain is 15 lbs. ADG = 15 ÷ 30 = 0.5 lbs/day.
What to do with this result
Compare the ADG against your target ADG to see if lambs are growing fast enough. If ADG drops, investigate feed quality or parasite loads.
Ready to track this for the whole flock?
One-off calculations are great for quick checks, but farm decisions are better when records are connected. HerdDeck Shepherd connects sheep records, weights, treatments, and feed costs in one easy app.
Try the DemoFrequently Asked Questions
A good ADG ranges from 0.4 to 0.8 lbs/day (200-350 g/day), depending on breed, age, and ration.
Low ADG can be caused by poor pasture quality, underfeeding, internal parasites, or poor genetics.
Weighing every 2 to 4 weeks gives a clear picture without causing too much stress to the animals.
Average Daily Gain.
Yes. If an animal loses weight (due to illness, severe weather, or lack of feed), the ADG will be negative.