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Bird Feeder Seed Usage Calculator

Work out bird feeder seed usage instantly with clear inputs, formula shown and shareable results.

About Bird Feeder Seed Usage Calculator

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.

Formulas

Seed quantity

grams = feeders x grams per feeder per day x days

Days per fill

days = feeder capacity / grams taken per day

Worked example

With the default values below, Bird Feeder Seed Usage Calculator returns Seed needed for the period of 6.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number of feedersminimum 1
2
Seed taken per feeder per dayminimum 1 g
100 g
Periodminimum 1 days
30 days
Feeder capacityminimum 1 g
400 g

Results

Seed needed for the period
6.000 kg
Refills required
16
Days one full feeder lasts
4.00
Small birds supported at 12 g each per day
17

Step by step

  1. 1Values used
  2. 2Seed quantity
  3. 3Days per fill
  4. 4Seed needed for the period= 6.000 kg
  5. 5Refills required= 16
  6. 6Days one full feeder lasts= 4.00
  7. 7Small birds supported at 12 g each per day= 17

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or tax into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Bird Feeder Seed Usage figure worked out?

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.

Why does this matter?

The days-per-fill figure is what prevents feeders standing empty, since birds abandon an unreliable source within a few days.

What do I need to enter?

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.

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