A complete pet mouse feeding guide with portion charts, schedule and a free calculator.
Pet Mouse feeding calculator
Enter a weight to get personalised daily portions. The calculator is preset for you — just add the weight and details.
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Pet Feeding Calculator
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What type of pet do you have?
Choose from the popular picks below, or search all 30+ species in the dropdown.
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🔍 All species — browse or search
Breed affects metabolic rate. A Greyhound burns more calories than a Bulldog of the same weight.
How much does your pet weigh?
Use your most recent weigh-in. Your vet's records are the most accurate source.
Very thin5/9Obese
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BCS adjusts the calorie target up or down based on your pet's current body condition. 5 = ideal weight.
What's their daily life like?
Pick the description that sounds most like your pet right now. These are written in plain English — no jargon.
What do you feed them?
Choose from our food database or enter the calorie number from your bag or can label.
How this works for aquatic pets: We use a percentage-of-body-weight method — no calorie counting needed. Just tell us the food type and number of animals.
For a whole tank, enter the total number of fish. We'll divide the daily portion.
These are typical average values. Use "Enter from label" to match your exact product.
Look for "Calorie Content" or "Metabolizable Energy (ME)" — usually near the ingredients list on the back or side of the bag or can. It reads something like "3,500 kcal/kg" or "350 kcal/cup". Match the toggle above to whichever unit your label shows. Can't find it? Use the list option — it's accurate enough for most foods.
We'll subtract this from the daily food portion.
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Daily feeding guide
These figures are estimates based on NRC/AAFCO veterinary nutrition formulas. Individual animals vary by up to ±20%. Adjust based on your pet's body condition over 4–6 weeks. Always consult your vet for medical dietary needs.
About feeding a pet mouse
Pet mice are tiny, fast-metabolising omnivores that eat little but often. Because they're so small, even a slightly rich diet or a few extra fatty seeds can tip them into obesity, so precise, low-fat feeding is key.
How much should a pet mouse eat?
Calorie needs use the veterinary formula 70 × weight(kg)0.75 (the Resting Energy Requirement), multiplied by a lifestyle factor of ×1.5 for a typical pet mouse at the life stage shown. Enter your own animal's details in the calculator for an exact figure.
Body weight
Daily calories
15 g
5 kcal
20 g
6 kcal
25 g
7 kcal
30 g
8 kcal
35 g
8 kcal
40 g
9 kcal
45 g
10 kcal
50 g
11 kcal
What to feed
A formulated mouse or rodent block plus a small grain mix forms the base, with tiny amounts of vegetables and occasional protein. Fatty seeds and sugary treats should be strictly limited given how small mice are.
How often to feed
Offer a small measured daily portion — mice eat around 3-5 g a day. They hoard, so check stashes. Fresh water must always be available.
Common feeding mistakes
Fatty seed mixes that mice over-select.
Sugary treats, which quickly cause obesity in such small animals.
Overfilling the bowl relative to their tiny needs.
Neglecting variety and gnawing opportunities.
Weight & health
Obesity is easy to cause and hard to spot on a 30 g animal. Keep the diet low-fat and balanced, offer enrichment and exercise, and weigh on a precise kitchen scale to track condition.
Frequently asked questions
How much do mice eat per day?
Very little — roughly 3-5 g of food a day. Offer a small measured portion of a balanced mouse diet and check hoards before adding more.
What do pet mice eat?
A formulated rodent block or mouse mix as the base, with tiny amounts of vegetables and occasional protein. Limit fatty seeds and sugary treats.
Can mice eat cheese?
Only as a rare tiny treat — the cartoon image is misleading. Cheese is fatty and mice are lactose-sensitive, so it shouldn't be a regular food.
Do mice need fresh vegetables?
Small amounts add variety and moisture, but they're a supplement to a balanced dry diet, not a staple. Remove perishables before they spoil in a hoard.