To compare cat-food prices fairly, divide the price of the whole pack by its total calories, then multiply by 100. This puts a small can, a case of pouches, and a bag of dry food on the same cost basis. It does not tell you which food is nutritionally right for your cat.
Use the exact recipe and pack size on the label, and the same currency for both options.
Compare two cat foods
Choose the calorie format printed on each label. Enter the price of everything in the pack, not the price of one can unless you are buying one can.
Your cost comparison
Product A · per 100 kcal
Product B · per 100 kcal
Lower energy cost is not a nutritional recommendation. Results assume the purchased food is usable and eaten; they do not account for leftovers.
The calculator runs in your browser. This component does not save or send your inputs.
How to calculate the cost yourself
Start with the price you would actually pay, including shipping, discounts, and tax if those apply. Treat these costs consistently across both options. Use the net amount of food, not the shipping weight.
When the label gives kcal per can or pouch
Pack calories = number of containers × kcal per container. Divide the pack price by that total and multiply by 100.
When the label gives kcal/kg
Pack calories = total food weight in kg × kcal/kg. Convert grams to kg by dividing by 1,000. For weight conversions, 1 oz = 0.028349523125 kg and 1 lb = 0.45359237 kg. Ounces here are weight, not fluid ounces.
For example, a hypothetical 2 kg bag costing USD 30, labeled 3,800 kcal/kg, contains 7,600 kcal. Its cost is 30 ÷ 7,600 × 100 = approximately USD 0.395 per 100 kcal.
Why the cheaper can can cost more
This is a hypothetical teaching example, not a comparison of real brands, current store prices, or nutritional quality.
| Input | Product A | Product B |
|---|---|---|
| Whole pack price | USD 24 | USD 30 |
| Cans in pack | 12 | 12 |
| kcal per can | 80 | 125 |
| Pack calories | 960 kcal | 1,500 kcal |
| Cost per 100 kcal | USD 2.50 | USD 2.00 |
A costs USD 2.00 per can and B costs USD 2.50. But B costs 20% less per 100 kcal, measured relative to A: (2.50 − 2.00) ÷ 2.50 × 100. B would reach the same energy cost as A at a pack price of USD 37.50.
That break-even price is useful when comparing a sale or subscription price. Recheck it when the recipe, pack size, shipping cost, or calories change.
Check these details before comparing
- Match the recipe and size. A calorie value for a different flavor or a larger can is not interchangeable. Use the current package or the manufacturer’s exact product listing.
- Read “Calorie Content.” AAFCO explains that calorie statements use kcal/kg as fed and a familiar unit, such as kcal per can or cup. A food-label Calorie is a kilocalorie. Source: AAFCO calorie-label guidance.
- Keep nutritional suitability separate. Check the nutritional adequacy statement and life stage. A topper or treat is not necessarily a complete diet. Cost alone should not decide feeding. Source: AAFCO label guidance.
- Account for what gets eaten. The main result assumes no waste. If only 80% of the purchased calories are actually eaten, the effective cost per eaten 100 kcal is the displayed result ÷ 0.8. This simplified adjustment assumes the wasted food has the same energy density.
- Do not confuse a trial discount with the ongoing price. Recalculate with the renewal price before treating a subscription as the cheaper option.
Common comparison questions
Can I compare wet and dry cat food?
Yes, on an energy-cost basis, using each exact product’s as-fed calorie value. This removes the misleading effect of comparing pack weight alone. It does not compare hydration, nutritional adequacy, suitability, or your cat’s preference. AAFCO cautions that moisture changes calories per kilogram.
What if a variety pack has different calories per recipe?
Do not use one recipe’s calorie value for the whole case. Add each recipe’s total: 6 × 80 kcal + 6 × 100 kcal = 1,080 kcal. For 12 equal-count containers, enter the count-weighted average, 90 kcal per container. Check each recipe and container size first.
What if I only have kcal per cup?
Use kcal/kg from the package or manufacturer alongside the bag’s net weight. Do not convert cups to grams with a generic density. If the required value is unavailable, ask the manufacturer rather than guessing.
Can this tell me how much to feed my cat?
No. This is a cost tool, not a calorie-needs or feeding calculator. Ask your veterinarian about your cat’s individual needs, particularly for growth, pregnancy, weight management, or a medical condition. If you already have a professionally advised daily calorie target, daily food cost = cost per 100 kcal × that target ÷ 100; mixed feeding needs separate calculations.
Sources, method, and limits
Buyer Voice Lab built this calculator using unit-price arithmetic and AAFCO’s public label-reading guidance. Tufts Petfoodology also explains why feeding-cost comparisons should use kilocalories rather than just pack weight. The inputs come from you; no retailer feed, live prices, laboratory testing, or Reddit review sample is used. Calculations use unrounded values internally, with rounded display results.
- AAFCO: Calories — kcal terminology, as-fed calorie labels, and comparison limits.
- AAFCO: Reading Labels — product identity, quantity, and nutritional adequacy statements.
- Tufts Petfoodology: Make “Cents” of Your Pet Food Budget — why energy-based cost comparison matters; includes a separate feeding-cost calculator.
Sources checked October 22, 2026. AAFCO guidance is U.S.-focused; labels in other markets may differ. We do not rank foods or infer nutritional quality from their price. These sources do not endorse Buyer Voice Lab.
For our broader evidence and correction approach, see Buyer Voice Lab’s methodology. Browse Weekly Reports for separate, time-scoped buyer-discussion research.
Reference this calculation
When sharing a result, include the exact recipe and pack size, price and currency, price-check date, calorie source, and whether shipping and tax are included. Label hypothetical numbers as examples.
Suggested citation: Buyer Voice Lab, “Cat Food Cost Calculator: Compare Price per 100 Calories,” by Mijackikova. Include the page URL and your access date. Cite the original manufacturer label separately for product calorie values.