Work out bird feeder seed usage instantly with clear inputs, formula shown and shareable results.
Seed use is feeders times daily consumption times days, and the number of birds supported divides the daily total by roughly twelve grams a day for a small garden bird. The days-per-fill figure is what prevents feeders standing empty, since birds abandon an unreliable source within a few days.
Seed quantity
grams = feeders x grams per feeder per day x days
Days per fill
days = feeder capacity / grams taken per day
grams = feeders x grams per feeder per day x days. Seed use is feeders times daily consumption times days, and the number of birds supported divides the daily total by roughly twelve grams a day for a small garden bird.
The days-per-fill figure is what prevents feeders standing empty, since birds abandon an unreliable source within a few days.
Enter number of feeders, seed taken per feeder per day, period, feeder capacity. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.