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FurCalc

Dog Food Cup/kcal Converter — Switch Brands Without Weight Gain

Convert between cups and kcal across 12+ common dog food brands. Critical when switching foods: match calories, not cups.

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5/9 · Ideal
ThinIdealObese
5/9 — Ideal

Ribs palpable without excess fat. Waist clearly observed behind ribs when viewed from above. Abdominal tuck visible from the side.

3 cups of Purina Pro Plan Adult =
3.38cups of Hill's Science Diet Adult
Calories unchanged: 1,224 kcal/day
Always transition over 7-10 days: 25/75 → 50/50 → 75/25 → 100% new food.

Frequently Asked Questions

How do I switch my dog to a new food without weight gain?

Match calories, not cups. If your dog eats 3 cups of 408 kcal/cup food (1,224 kcal), they need 1,224 ÷ (kcal/cup of new food) to maintain weight. A 305 kcal/cup food would require ~4 cups to match.

Why do cup amounts differ between brands?

Kibble density (kcal per cup) varies by formulation. Dry, high-fat foods are calorie-dense (400-470 kcal/cup); weight-management formulas are lower (300-350 kcal/cup). Always use the bag's feeding guide as starting point.

How long should food transitions take?

7-10 days minimum. Day 1-3: 25% new, 75% old. Day 4-6: 50/50. Day 7-9: 75% new. Day 10+: 100% new. Sensitive dogs: extend to 2-3 weeks.

Sources & References

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Editor’s picks

Products our editorial team uses or recommends based on the calculator above. We do not receive any commission on these picks — no outbound affiliate links.

  • Hill's Science Diet

    Hill's Science Diet Adult Dry Dog Food

    Vet-recommended. 363 kcal/cup — reference data in this calculator.

    $59.99typically sold at amazon
  • Purina Pro Plan

    Purina Pro Plan Adult Sensitive Skin & Stomach

    Salmon + rice formula for dogs with GI / skin sensitivity.

    $64.99typically sold at chewy

Search the product name on your preferred retailer to buy — FurCalc is not paid to feature these picks.