Automatic Cat Feeder Portions in Grams: How to Measure Your Feeder

To convert automatic cat feeder portions into grams, weigh repeated dispenses of your actual kibble and divide the average weight by the portion setting used. There is no universal grams-per-portion conversion. Use the measured result to translate an already established food allowance into feeder settings, then check the complete meal before relying on it.

A display that says “3 portions” tells you what the machine is programmed to do. It does not, by itself, tell you the weight in the bowl or whether that food is the right daily amount for your cat. This guide separates those questions and gives you a repeatable measurement worksheet.

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Use your measured portions in the calculator

First measure grams per portion using the steps below. Then calculate meal totals and food-bag duration in the dedicated tool.

Open the Feeder Portion Calculator →

Why one portion is not a standard weight

On volume-based dispensers, different kibble shapes and densities can produce different weights at the same setting. PETLIBRO’s portion reference explicitly describes the portion by volume rather than weight. Its listed volumes also differ between feeder families. Read PETLIBRO’s model-specific portion reference.

Manufacturer volume references—not guaranteed gram conversions
Model family	Approximate volume per portion	What to do with it
Essential PLAF001/101	12.5 mL	Measure the kibble you will actually use.
Essential PLAF002/102	18.8 mL	Do not copy settings from the smaller model.
Granary PLAF005/006/103/203	20 mL	Check the exact model and its current manual.
Air PLAF008/108	10.4 mL	A similar-looking portion number may dispense less volume.
One RFID PLAF301	20 mL	Check dispensing quantity separately from tag access.

These references were checked September 9, 2026. Hardware revisions and regional documentation can differ. A model label and a current manual are more reliable identifiers than a retailer’s shortened product name.

How to measure your automatic feeder’s output

Record the setup. Note the feeder model, kibble name, test setting and date. Keep the food unchanged throughout the check.
Prepare the feeder. Assemble and prime it as its manual requires. An empty dispensing chamber immediately after cleaning can distort the first reading.
Zero the scale. Put the empty receiving bowl on a kitchen scale, select grams and use tare. Keep the scale on a stable surface.
Run one complete cycle. Use the same setting each time. Wait until dispensing has finished before weighing the food.
Record each weight separately. Aim for ten cycles for this household check. Keep the cat from eating the samples before they are weighed.
Calculate and inspect. Compare the average with the smallest and largest results. A plausible average can hide missed or uneven cycles.
Verify the planned meal. Test the complete meal setting and observe a scheduled feeding as well as a manual one.

Ten readings are a practical sampling choice for this worksheet, not a certification of feeder accuracy. A short check cannot prove long-term reliability. Repeat it after relevant changes and keep a manual feeding option available.

Worked example: converting portions to grams

Hypothetical example: ten one-portion cycles weigh 9, 10, 8, 9, 10, 9, 8, 10, 9 and 9 grams. Their total is 91 grams; the average is 9.1 grams per portion, with an observed range of 8–10 grams. These numbers are illustrative, not MeowBay test results.

If an already agreed meal allowance is 45 grams, the estimate is 45 ÷ 9.1 = 4.95 machine portions. That does not establish that five portions will reliably deliver 45 grams. Measure the full setting, check whether it suits the feeding plan and account for any separately served food.

If every sample used a setting of two portions instead, divide the average sample weight by two first. Enter that normalized grams-per-portion value in the standalone calculator. It takes a portion weight, not a list of raw sample readings.

Copy this feeder measurement log

Reusable record for your own measurements
Setup	Model: ____ · Food: ____ · Date: ____ · Test setting: ____
Ten readings in grams	1: ____ 2: ____ 3: ____ 4: ____ 5: ____ 6: ____ 7: ____ 8: ____ 9: ____ 10: ____
Summary	Total: ____ · Average per cycle: ____ · Grams per machine portion: ____
Variation	Lowest: ____ · Highest: ____ · Missing or interrupted cycle: ____
Full meal check	Setting: ____ · Measured weight: ____ · Scheduled meal observed: ____

Retain the earlier log when changing foods. Comparing records helps distinguish a change in kibble from a change in the feeder. Do not erase a zero reading as an “outlier”: a missed dispense belongs in the troubleshooting record, because a normal average can hide an unreliable dispenser.

When should you recheck the conversion?

After changing the kibble brand, recipe, shape or size.
After cleaning and reassembling the dispensing parts.
When the food in the bowl no longer matches the usual output.
After a relevant firmware or hardware change, following the maker’s instructions.
Before handing the routine to a sitter who will depend on your written settings.

Measuring dispensed food and calibrating a built-in scale are different tasks. For example, PETLIBRO recommends recalibrating the Granary 2 scale after disassembly and reassembly. Use the instructions for your version rather than assuming this guide replaces that procedure. Granary 2 manufacturer information.

Common mistakes with feeder portion settings

Confusing meals with portions: four meal times do not mean four portions of food. Using a universal cup conversion: a cup measures volume, while this worksheet measures mass. Ignoring other food: separately served meals and treats still belong in the overall feeding plan. Increasing the setting to hide a fault: irregular dispensing needs investigation first.

For a feeder delivering nothing or only occasional pieces, use our automatic feeder troubleshooting checklist. If the question is connectivity rather than quantity, read what happens when a feeder loses Wi-Fi.

Questions about automatic feeder portions

Is one PETLIBRO portion always 10 grams?

No. A listed gram value may be approximate, and model families use different portion volumes. Check the model-specific reference and weigh your food. Avoid treating a retailer’s generic conversion as a measurement of your own setup.

Can a portion calculator decide how much my cat should eat?

No. It estimates food output from the portion weight and settings you provide. Establish the daily food allowance separately, with veterinary guidance where needed, and account for all food sources.

What if the machine cannot deliver the amount I need?

Do not assume a desired gram amount corresponds to a setting your feeder supports. Consider a measured manual portion or a more suitable device after checking your feeding plan. Consistent access also matters: our One RFID research review discusses selective access separately from dispensing quantity.

Research-based guide. Sources checked September 9, 2026. Calculator examples are hypothetical; no hands-on product test is claimed. Read our editorial policy.

Keep separate conversions for separate foods

A feeder portion is not a permanent gram value. Preserve the food and configuration that produced each measurement.

Decision or record	How to apply it
Configuration	Exact feeder, rotor or splitter, setting and ordinary hopper level.
Food	Recipe, bag lot if available, piece characteristics and measured output series.
Conversion	Average grams per release and the date to recheck after a change.

Illustration: a 5 g average with one food and 6 g with another creates a 20% difference for the same nominal release. That arithmetic explains why reusing the old conversion can matter; neither value is a result from a tested model.

Check whether the average hides a dispensing problem

A mean output is useful only alongside the individual results. Keep zeros, interruptions and unusual releases in the record instead of discarding them to produce a tidy conversion. Reliability and average amount answer different questions.

A missed-release example

In an invented series, eight complete commands each release 10 g and two release nothing. Total output is 80 g across ten commands, giving an 8 g mean per command. Looking only at the eight successful releases gives 10 g, but hides two missed outputs.

Do not increase the setting to compensate for the 8 g mean. If normal releases resume, that larger setting could supply an unintended amount. Investigate the intermittent fault using the exact manual and the feeder troubleshooting guide, while maintaining the established manual feeding arrangement.

Normalize the actual setting you measured

If every sample uses two machine portions, the average cycle output must be divided by two before recording grams per portion. Otherwise, the later calculator will multiply an already doubled figure.

For example, fictional cycle results of 23, 24 and 25 g average 24 g. At a setting of two portions, that is an estimated 12 g per machine portion for this small example. It is not 24 g per portion, and it is not a result from any named device.

Verify the complete intended setting

Multiplying that normalized estimate by four suggests 48 g for a four-portion command. It does not establish that the mechanism will actually release exactly 48 g. Check the complete supported setting and its variation rather than assuming perfect linearity.

Use an appropriate feeding plan established separately. If available increments cannot reliably match the required allocation, consider a suitable manual component or different supported arrangement instead of changing the cat’s needs to fit the device.

Keep measurement conditions reproducible

Field	Why it matters
Exact food	Recipe, shape and package identity tie the conversion to what was measured.
Configuration	Model, permitted assembly and any splitter or rotor affect the setup.
Scale method	Grams, stable surface and empty-bowl tare keep bowl mass out of food mass.
Event type	Manual command and saved scheduled meal should be identified separately.
Exceptions	Missed release, interruption or food collected elsewhere remains visible.

Do not change food or assembly in the middle of a series and combine the results without noting it. Keep the earlier record when rechecking so a difference can be interpreted against a known change.

Turn the conversion into a usable caregiver instruction

Write the exact food, device setting, expected approximate output and the date checked. Include the appropriate daily allocation and any manually supplied component. State what the caregiver should do if physical output differs or the device faults.

A setting alone is incomplete. The caregiver also needs to know whether food actually reached the bowl and which cat can access it. A correct gram conversion does not prevent another cat eating the meal.

Recheck after a relevant food or setup change under the manual’s instructions. The goal is a traceable practical estimate with a functioning backup, not a permanent universal grams-per-portion claim.

Keep display precision in perspective

A scale showing decimal places does not establish that the entire feeding system is accurate to those places. Record the scale’s supported method and the observed range. Avoid reporting a conversion with more apparent precision than the measurements justify.

If each sample is small relative to the scale’s usable resolution, consult its instructions and choose an appropriate measurement method. Do not invent an extra decimal by averaging values that were never observed.

When sharing the result, include the raw readings and conditions beside the mean. Another caregiver can then see whether the conversion reflects consistent releases or a variable series. A transparent approximate number is more useful than a precise-looking number with its exceptions removed.