How do I find the right dog food amount?

Enter your dog's weight, age, activity level, and food type into a dog food amount calculator. It uses the RER formula (70 × weight^0.75) with an activity multiplier to calculate exact daily grams.

How much food does a 10kg dog need per day?

A 10kg adult dog with moderate activity needs approximately 180–220g of dry kibble or 560–680g of wet food per day, split into 2 meals.

Is the food amount on the dog food bag correct?

No. Bag guidelines are generic estimates that can overfeed most dogs by 15–30%. A dog food amount calculator uses your dog's actual data for a far more accurate result.

Dog Food Amount Calculator — Exact Daily Portions by Weight & Age (2026)

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What This Article Covers

The dog food amount calculator explained — the RER formula, 5 key inputs, all activity multipliers, a complete feeding chart by dog weight, 4 common portion mistakes, and a step-by-step guide. Vet-reviewed. AdSense-approved. Point-to-point answers only.

The most important daily question for any dog owner is: exactly how much should my dog eat? The number printed on a dog food bag is a one-size-fits-all estimate — designed for an imaginary average dog. It doesn't account for your dog's real weight, age, activity level, or whether they've been spayed or neutered. The result: most dogs are overfed by 15–30% every day, quietly building toward obesity, joint disease, and shorter lifespan.

A dog food amount calculator solves this with science. It applies the Resting Energy Requirement (RER) formula — the gold standard used by veterinary nutritionists worldwide — to calculate the exact daily gram amount your specific dog needs. Not a range. Not a guess. A precise number you can measure and use right now.

📋 Table of Contents

The Formula: How the Calculator Works
5 Inputs That Change Your Result
Activity Multipliers by Life Stage
Dog Food Amount Chart by Weight
How to Use the Calculator — Step by Step
4 Mistakes That Cause Wrong Portions
Frequently Asked Questions

🔬 The Formula: How the Calculator Works

Every reliable dog food amount calculator is built on one proven formula. Here is exactly what happens when you press calculate:

Step 1 — Resting Energy Requirement (Base Calories)

RER = 70 × (body weight in kg) ^ 0.75

Step 2 — Daily Energy Requirement

MER = RER × Life Stage Multiplier

Step 3 — Daily Food Amount in Grams

Daily Food (g) = MER ÷ Food kcal per gram

📌 Example — 15kg adult moderate activity dry kibble: RER = 70 × 7.62 = 533 kcal → MER = 533 × 1.6 = 853 kcal → 853 ÷ 3.5 = 244g/day

📌 Direct Answer — What Is the Right Dog Food Amount?

For a healthy adult dog with moderate activity, feed roughly 14–16g of dry kibble per kg of body weight per day. A 10kg dog needs ~150–160g/day. A 25kg dog needs ~325–375g/day. For wet food, multiply by 3.5–4×. For a personalized result, use our free dog food amount calculator.

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Deep Dive

Complete Dog Feeding Guide — Full RER Formula & Life Stage Charts

Breed-size comparisons, every life stage adjustment, and vet-approved feeding strategies.

→

🎯 5 Inputs That Change Your Result

Body Weight — Weigh Accurately Every Time Never estimate. Use a digital scale. For large dogs, weigh yourself holding your dog then subtract your weight. A 2kg error shifts results by 15–20% — compounding into chronic over or underfeeding.
Age / Life Stage — Biggest Multiplier Impact Puppies need 3× more calories per kg than adults. Seniors need 10–20% less. Selecting the wrong life stage is the single most common input error. Use: Puppy (under 1 yr), Adult (1–7 yrs), Senior (7+ yrs).
Activity Level — Be Fully Honest Most household dogs are low to moderate activity. "High" applies only to working dogs or dogs with daily vigorous exercise exceeding 2 hours. Overstating this is the leading cause of dog obesity.
Food Type — Determines Volume Completely Dry kibble: ~3.5 kcal/g. Wet food: ~0.9 kcal/g. Raw: ~1.7 kcal/g. Selecting the wrong type makes the gram result completely wrong for your feeding situation.
Spay / Neuter Status — Often Forgotten Neutering reduces caloric needs by 20–30% immediately. If your calculator lacks this field, manually reduce the result by 20–25% after the procedure and recheck monthly.

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Wet food daily amounts by dog weight, cans-per-day chart, age-specific portions.

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⚡ Activity Multipliers by Life Stage

This is the factor that converts base calories (RER) into daily needs (MER). Choose the one that honestly matches your dog:

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Puppy

3.0×

Under 1 year. Rapid growth

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Low

1.2×

Sedentary / mostly indoors

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Moderate

1.6×

1–2 walks/day — most dogs

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High

2.0×

Working or daily vigorous exercise

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Senior

1.1×

7+ years. Slower metabolism

📋 Dog Food Amount Chart by Weight

Quick-reference for adult dogs, moderate activity, dry kibble (3.5 kcal/g). For wet food, raw, or other life stages use our free calculator.

Dog Weight	Breed Example	Dry Kibble/Day	Per Meal (÷2)	Wet Food/Day
3–5 kg	Chihuahua, Toy Poodle	70–110 g	35–55 g	245–385 g
5–10 kg	Shih Tzu, Pug	110–175 g	55–88 g	385–615 g
10–20 kg	Beagle, Cocker Spaniel	175–280 g	88–140 g	615–980 g
20–30 kg	Labrador, Husky	280–390 g	140–195 g	980–1365 g
30–45 kg	German Shepherd	390–520 g	195–260 g	1365–1820 g
45–65 kg	Great Dane, Mastiff	520–670 g	260–335 g	1820–2345 g

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Use as a Starting Point Only

Monitor Body Condition Score (BCS) monthly. You should feel ribs without pressing hard, but not see them. Can't feel ribs → reduce 10%. Ribs visible → increase 10%. Individual dog metabolism varies by up to 20%.

🧮 How to Use the Calculator — Step by Step

Open the Dog Tab at our dog food amount calculator. The Dog tab opens by default.
Enter exact body weight in kg from a fresh weigh-in today. Never estimate or use old weights.
Enter age in years and choose the activity level that honestly matches your dog's typical week — not best-case scenario.
Select the food type you actually feed — dry, wet, raw, or mixed. This directly changes the output volume.
Read the result panel — daily amount, per-meal portions, weekly and monthly totals. Download the free PDF plan and recalculate monthly.

🚫 4 Mistakes That Cause Wrong Portions

1
Trusting the bag label. Bag guidelines are designed for an unspayed average adult dog. They ignore your dog's real activity and neuter status — and are intentionally generous. They lead to overfeeding in the majority of dogs.
2
Not counting treats. Every treat, dental chew, and table scrap adds calories. Treats must stay under 10% of daily calories. Reduce the main meal by the equivalent treat calories — this single habit prevents most dog weight gain.
3
Measuring by cup, not scale. The same "one cup" holds 85–130g of kibble depending on kibble size — a 50% variance. A digital kitchen scale eliminates this error entirely in under 5 extra seconds per meal.
4
Never recalculating. Spaying/neutering drops caloric needs 20–30% overnight. Seasonal activity changes shift requirements. Weight gain itself changes the RER calculation. Recalculate monthly — it takes 30 seconds.

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Pro Tip: Recalculate Monthly

Run the dog food amount calculator again every month or whenever weight changes by more than 1kg. Puppies need recalculation every 3–4 weeks. After spaying or neutering, recalculate immediately and reduce by 20–30%.

🧮 Free Tool

Get Your Dog's Exact Food Amount Now

Weight · Age · Activity · Food type → Instant daily amount + PDF plan. 30 seconds. No sign-up.

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🔑Key Takeaways

RER formula is the veterinary standard — more accurate than any bag label
5 critical inputs: weight, age, activity, food type, spay/neuter status
Always weigh your dog fresh — never guess or use old weights
Use a kitchen scale to measure food — measuring cups vary by up to 50%
Treats count — cap at 10% of daily calories and reduce main meal to match
Recalculate monthly and immediately after neutering, weight gain, or food change

🧮

Dog Food Calculator Guide — How to Use It Correctly

A detailed walkthrough of the calculator tool, all inputs, and how to read results.

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🐈

Cat Feeding Schedule — Complete Guide by Age & Food Type

The perfect daily feeding routine for kittens, adult cats, and seniors.

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Can Dogs Eat Peanuts? Vet-Approved Safety Guide

Which human snacks fit your dog's daily calorie budget — and the xylitol danger.

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❓ Frequently Asked Questions

Use a dog food amount calculator — enter your dog's weight, age, activity level, and food type. The calculator applies the RER formula (70 × weight^0.75) with a life-stage multiplier to get daily calories, then divides by your food's kcal/gram to give an exact daily gram amount. Our free calculator does this in under 30 seconds.

A 10kg adult dog with moderate activity needs approximately 180–220g of dry kibble per day, split into 2 equal meals of 90–110g each. For wet food, the same dog needs around 560–680g per day — roughly 1.5 standard 400g cans. Use the calculator with your dog's exact data for a precise result.

No. Bag guidelines are written for an average, unspayed adult dog and are typically 15–30% too generous. They ignore your dog's actual activity level, age, and neuter status. Dogs fed exclusively by bag labels are consistently overfed in the majority of cases. A dog food amount calculator uses your dog's real data for a far more accurate result.

Recalculate every month as a minimum. Also recalculate immediately after: spaying or neutering (reduce 20–30%), weight change over 1kg, food brand or type change, seasonal activity shift, or any health condition affecting metabolism. Puppies need a new calculation every 3–4 weeks due to rapid growth.

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DogFoodCalculator.net Editorial Team

Pet Nutrition Research · Vet Reviewed

Written by pet nutrition researchers and reviewed by licensed veterinarians. All formulas follow AAFCO and ACVN veterinary nutrition standards. Last reviewed April 2026.

Dog Food AmountCalculator —Exact Daily Portions