UNDERSTAND YOUR FEEDER
Convert feeder portions to grams per meal, day and month using the weight of one portion. Add a bag weight to estimate how long the food will last.
This tool estimates feeder output. It does not determine how much your cat should eat.
Your feeder settings
Use the same portion setting for every meal in this calculation. All quantities refer to one feeder’s total output.
YOUR RESULT
See what the settings mean
Enter your values to calculate output. You can get the full result without signing up or visiting a retailer.
Estimates assume the same portion weight and meal settings every day. Actual output can vary with food and feeder conditions. Bag duration excludes spills, leftovers and food served elsewhere.
Compare automatic cat feeders →How to convert automatic feeder portions to grams
Grams per meal = grams per dispenser portion × portions per meal. Daily output = grams per meal × meals per day. Weekly and 30-day output multiply the daily total by 7 and 30.
Example: 7 g × 4 portions × 3 meals = 84 g/day. That is 28 g per meal, 588 g per week and 2.52 kg over 30 days. These example settings are not a feeding recommendation.
Feeder portion conversion examples
These hypothetical examples show the arithmetic. They are not product specifications or suggested feeding schedules.
| Grams per portion | Portions per meal | Meals per day | Grams per meal | Grams per day |
|---|---|---|---|---|
| 5 g | 2 | 3 | 10 g | 30 g |
| 7 g | 4 | 3 | 28 g | 84 g |
| 7.5 g | 2 | 4 | 15 g | 60 g |
How long will a bag of cat food last?
Divide the bag weight in grams by the feeder’s daily output. For example, a 2 kg bag contains 2,000 g. At an entered output of 60 g/day, the mathematical estimate is 2,000 ÷ 60 = approximately 33.33 days. If you use the same bag for other meals, it will run out sooner than this estimate.
How to measure one automatic feeder portion
Follow your feeder’s instructions and use a suitable kitchen scale. Weigh repeated portions of the food you actually use; record their variation as well as the average. Recheck after changing kibble or portion settings. A manufacturer’s nominal portion weight is a specification, not your own measurement.
For a simple calibration record:
- Put an empty collection bowl on the scale and zero it.
- Dispense one machine portion according to the device instructions and note its weight.
- Repeat with the same food and setting. Record each result rather than keeping only the largest or smallest.
- Divide the total measured weight by the number of portions measured to obtain an average.
Illustration: readings of 6.8 g, 7.1 g and 7.1 g average 7 g per portion. The average does not mean every portion weighs exactly 7 g, and this small example does not establish long-term accuracy.
What the result does not tell you
- It cannot decide your cat’s nutritional needs or recommend a diet.
- It reports total machine output, not how much each cat consumes.
- It does not model different portion settings for different meals.
- Bag duration is an estimate, not a replacement date guarantee.
Feeder portion calculator questions
My feeder says “one portion.” Is that one gram?
No universal gram weight applies to every feeder. Check or measure the exact model with the food you use.
Can I use this for two cats?
You can calculate the feeder’s total output. It cannot determine how that food is shared. See our two-cat feeder guide for setup considerations.
Why are results described as estimates?
The arithmetic uses your inputs without intermediate rounding. Your portion weight may be approximate, and real dispensing can vary. Displayed numbers use up to six decimal places; a month here means 30 days.
Can I use this with PETLIBRO, PetSafe or another feeder?
The calculation is brand-neutral: it uses grams per machine portion, portions per meal and meals per day. It does not contain preset specifications for any brand. If your device measures servings differently, do not treat those servings as equivalent without checking the instructions.
Can I convert cups directly to feeder portions?
Not with this tool. It accepts grams, not a universal cups-to-grams assumption. Food shape and density affect how much fits in a volume. Measure the weight you need for the calculation.
My meals have different portion settings. What should I do?
Calculate each meal separately using one meal per day, then add the grams-per-meal results to find the daily total. The weekly, monthly and bag-duration results from any single meal calculation do not represent the combined routine.