Pet Food Cost Calculator — Monthly, Annual & Lifetime Food Budget
Estimate how much you spend on pet food daily, monthly, and over your pet's remaining lifespan based on bag price, bag weight, and daily portions.
Food Cost
Monthly Cost
$28
Recommended: 2 cups/day
Source & methodology
Last reviewed:
Methodology
Converts bag price, bag weight, and daily cups into daily, monthly, annual, and remaining lifetime food costs using 4 cups per pound dry food.
Limitations
Estimate based on entered portions and prices. Wet food, treats, and prescription diets are not included.
How to budget for pet food
Food is one of the largest recurring pet expenses. This calculator converts bag price, bag weight, and daily cups into daily, monthly, annual, and lifetime totals. The core formula: daily cost = bag price ÷ (bag weight in lb × 4 cups/lb ÷ daily cups). Standard dry kibble averages about 4 cups per pound.
A 30 lb bag at $55 with a medium dog eating 2 cups/day yields 120 cups per bag, lasting 60 days — roughly $0.92/day, $28/month, and $335/year. Adjust any input to match your brand, bag size, or feeding routine.
Recommended daily portions by size
| Pet | Daily cups | 30 lb bag lasts | Monthly cost ($55 bag) | Annual cost |
|---|---|---|---|---|
| Small dog | 0.75 cup | ~160 days | ~$10 | ~$125 |
| Medium dog | 2 cups | ~60 days | ~$28 | ~$335 |
| Large dog | 3.5 cups | ~34 days | ~$49 | ~$590 |
| Giant dog | 5 cups | ~24 days | ~$69 | ~$830 |
| Indoor cat | 0.5 cup | ~240 days | ~$7 | ~$84 |
Worked example: 3-year-old medium dog
A 3-year-old medium dog with 13 years life expectancy eating 2 cups/day from a $55 / 30 lb bag:
- Daily cost: $55 ÷ 60 days = $0.92
- Monthly cost: $0.92 × 30.44 = ~$28
- Annual cost: ~$335
- Remaining lifetime (10 years): ~$3,350 in food alone
Premium brands cost more per bag but may require smaller portions due to higher calorie density. Wet-food-only diets typically run 2-3× dry food costs. Enter your actual bag price and cups — the calculator reflects what you spend regardless of brand tier.
Food as part of total ownership cost
| Expense | Medium dog annual | % of total budget |
|---|---|---|
| Food | $400-$600 | ~22-28% |
| Routine vet | $250-$500 | ~14-21% |
| Insurance | $400-$520 | ~21-26% |
| Grooming + supplies | $200-$650 | ~11-27% |
Pair with the puppy growth calculator to adjust portions as your dog grows, or read the full annual dog cost breakdown.
Frequently asked questions
How much does dog food cost per month?
A medium dog eating 2 cups/day from a $55, 30-lb bag costs roughly $55-$75/month depending on brand and portion size. Small dogs may spend $25-$40/month; giant breeds can exceed $120/month. This calculator converts bag price, bag weight, and daily cups into monthly and annual totals.
How much does cat food cost per month?
An average indoor cat eating about half a cup of dry food daily from a standard bag typically costs $20-$35/month. Wet-food-only diets cost more. Enter your actual bag size, price, and daily portion for a personalized estimate.
How do I calculate lifetime pet food cost?
Multiply annual food cost by remaining expected lifespan. A 3-year-old medium dog with 10 years remaining at $65/month spends about $7,800 on food alone. Adjust life expectancy by breed and size — small dogs often live longer than giant breeds.
How many cups of food should my dog eat daily?
Portions depend on size, activity, and calorie density of the food. Small dogs often need 0.5-1 cup/day; medium dogs 1.5-2.5 cups; large dogs 3-4 cups; giant breeds 5+ cups. Always follow your veterinarian's recommendation and the bag's feeding chart for your dog's target weight.
Does premium food change the monthly cost?
Yes. Premium brands cost more per pound but may require smaller portions due to higher calorie density. Enter your actual bag price and daily cups — the calculator reflects what you actually spend regardless of brand tier.