Pet Daily Calorie & Feeding Calculator

ANA›Life Services Authority›National Calculator Authority›Pet Daily Calorie & Feeding Calculator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Pet Daily Calorie & Feeding Calculator

Calculate your pet's daily calorie requirements and recommended feeding amounts based on species, weight, life stage, and activity level using veterinary-standard RER and MER formulas.

Pet Species

Dog Cat

Body Weight

kg lb

Life Stage

Adult (intact) Adult (neutered/spayed) Puppy / Kitten (< 4 months) Growing (4 months – 1 year) Senior (7+ years) Pregnant Lactating

Activity Level

Sedentary (little/no exercise) Low (light activity 1–2×/week) Moderate (active 3–5×/week) High (very active daily) Working / Performance

Food Caloric Density (kcal/cup or kcal/100g)

kcal / cup kcal / 100g

Optional – leave blank to skip feeding amount

Calculate

function petUpdateFields() { // Could be extended for species-specific UI tweaks }

function petCalc() { var resultDiv = document.getElementById("pet-result");

// --- Inputs --- var species = document.getElementById("pet-species").value; var weightRaw = parseFloat(document.getElementById("pet-weight").value); var weightUnit= document.getElementById("pet-weight-unit").value; var lifestage = document.getElementById("pet-lifestage").value; var activity = document.getElementById("pet-activity").value; var foodKcal = parseFloat(document.getElementById("pet-food-kcal").value); var foodUnit = document.getElementById("pet-food-unit").value;

// --- Validation --- if (isNaN(weightRaw) || weightRaw ⚠ Please enter a valid body weight greater than 0."; resultDiv.style.display = "block"; return; }

var maxWeight = (weightUnit === "kg") ? 200 : 440; if (weightRaw > maxWeight) { resultDiv.innerHTML = "⚠ Weight seems too high. Please check the value and unit."; resultDiv.style.display = "block"; return; }

// Convert weight to kg var weightKg = (weightUnit === "lb") ? weightRaw * 0.453592 : weightRaw;

// --- Step 1: Resting Energy Requirement (RER) --- // RER (kcal/day) = 70 × (body weight in kg)^0.75 var rer = 70 * Math.pow(weightKg, 0.75);

// --- Step 2: Maintenance Energy Requirement (MER) via life-stage factor --- // Factors from WSAVA / NRC / AAFCO guidelines var lifestageFactor; var lifestageLabel;

if (species === "dog") { var dogFactors = { "adult": { base: 1.6, label: "Adult intact dog" }, "neutered": { base: 1.4, label: "Adult neutered/spayed dog" }, "puppy_kitten": { base: 3.0, label: "Puppy 0) { var dailyAmount = mer / foodKcal; var perMeal2 = dailyAmount / 2; var perMeal3 = dailyAmount / 3;

var unitLabel = (foodUnit === "cup") ? "cups" : "× 100g portions"; var unitSingle= (foodUnit === "cup") ? "cup" : "× 100g";

feedingHtml = "Daily Food Amount" + dailyAmount.toFixed(2) + " " + unitLabel + "" + "If feeding 2×/day" + perMeal2.toFixed(2) + " " + unitSingle + " per meal" + "If feeding 3×/day" + perMeal3.toFixed(2) + " " + unitSingle + " per meal"; } else { feedingHtml = "Enter food caloric density above to calculate feeding amounts."; }

// --- Weight display ---
var weightDisplay = (weightUnit === "lb")
? weightRaw.toFixed(1) + " lb (" + weightKg.toFixed(2) + " kg)"
weightKg.toFixed(2) + " kg";

// --- Ideal weight note --- var bmiNote = ""; if (weightKg ⚠ Very low weight – please verify input or consult a vet."; if (species === "dog" && weightKg > 80) bmiNote = "⚠ Very large dog – confirm weight is accurate."; if (species === "cat" && weightKg > 10) bmiNote = "⚠ Weight is above typical cat range – confirm or consult a vet.";

// --- Output --- resultDiv.innerHTML = "### Results " + "" + "ParameterValue" + "Species" + species.charAt(0).toUpperCase() + species.slice(1) + "" + "Body Weight" + weightDisplay + "" + "Life Stage" + lifestageLabel + "" + "Activity Level" + actLabel + (applyActivity ? "" : " (not applied – overridden by life stage)") + "" + "RER (Resting Energy)" + rer.toFixed(1) + " kcal/day" + "Life-Stage Factor" + lifestageFactor.toFixed(1) + (applyActivity ? " × " + actMult.toFixed(2) + " (activity) = " + finalFactor.toFixed(2) : "") + "" + "Daily Calorie Need (MER)" + mer.toFixed(0) + " kcal/day" + feedingHtml + bmiNote + "" + "These are estimates. Adjust based on your pet's body condition score and veterinary guidance.

";

resultDiv.style.display = "block"; }

#### Formulas Used

Step 1 – Resting Energy Requirement (RER):

RER (kcal/day) = 70 × (body weight in kg)0.75

This is the metabolic scaling formula endorsed by WSAVA, NRC, and AAFCO. The exponent 0.75 reflects allometric scaling of metabolic rate across body sizes.

Step 2 – Maintenance Energy Requirement (MER):

MER (kcal/day) = RER × Life-Stage Factor × Activity Multiplier

Life-stage factors (dogs): Puppy <4 mo = 3.0 | Growing = 2.0 | Adult intact = 1.6 | Neutered = 1.4 | Senior = 1.2 | Pregnant = 3.0 | Lactating = 4.0

Life-stage factors (cats): Kitten <4 mo = 2.5 | Growing = 1.8 | Adult intact = 1.4 | Neutered = 1.2 | Senior = 1.1 | Pregnant = 2.0 | Lactating = 3.0

Activity multipliers (applied to adult/neutered/senior only): Sedentary = 0.8 | Low = 0.9 | Moderate = 1.0 | High = 1.25 | Working = 1.7

Step 3 – Daily Feeding Amount (optional):

Daily Amount = MER ÷ Food Caloric Density (kcal/cup or kcal/100g)

#### Assumptions & References

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