Updated 19 October 2026

Dog ideal weight calculator

By VicayaGlobal Calculator Editorial Team

Score your dog’s body condition on the 9-point WSAVA scale, and this page turns it into an ideal weight by the rule veterinarians use — each point above or below 5 is about 10 % of body weight — then into a safe timeline at the canine rate. Three steps most guides leave you to do alone.

DogCat ideal weight calculator

Current weightlb

Body condition score (WSAVA 9-point)

Feel the ribs and look at the waist from above and the side; the chart in the sources shows each score.

54.9 lb, ideal weight

+20 % from ideal: lose 11 lb over 8.3–16.7 weeks at 1–2 % of body weight a week.

Rule: each BCS point away from 5 ≈ 10 % of body weight (Laflamme 1997): 66 lb ÷ (1 + 0.1 × 2) = 54.9 lb
Range (10–15 % per point): 50.7 lb to 54.9 lb
Weeks to goal at 1–2 % a week (AAHA 2021): 8.3 weeks at the fast rate, 16.7 at the slow rate
Next step: Feed to the ideal weight, not today’s: the dog food calculator’s weight-loss mode takes the ideal weight and the WSAVA factor.

What this means

Body condition score is a hands-on measure, and it is what the ideal weight comes from — not the breed average, which says nothing about this animal’s frame. Feel for the ribs, look for a waist from above and a tuck from the side, and pick the score that matches the chart.

The 10 %-per-point rule is Laflamme’s approximation: her work found each point to be 10–15 % of body weight, which is why the range row exists. Safe loss for dogs is 1–2 % a week (AAHA 2021); several online tools quote the wrong unit or the wrong species.

Weight loss is planned on the ideal weight, not the current one: the diet’s calories come from the target weight’s resting energy, which is what the feeding calculator’s weight-loss mode does.

Ideal weight by body condition score

On the 9-point body condition scale, 5 is ideal and each point above it is about 10% over ideal weight. Find the current weight in the first column and the body condition score across the top.

Ideal weight by body condition score
Current weight	BCS 6 (10% over)	BCS 7 (20% over)	BCS 8 (30% over)	BCS 9 (40% over)
20 lb (9.1 kg)	18 lb (8.2 kg)	17 lb (7.6 kg)	15 lb (7.0 kg)	14 lb (6.5 kg)
40 lb (18.1 kg)	36 lb (16.5 kg)	33 lb (15.1 kg)	31 lb (14.0 kg)	29 lb (13.0 kg)
60 lb (27.2 kg)	54 lb (24.7 kg)	50 lb (22.7 kg)	46 lb (20.9 kg)	43 lb (19.4 kg)
80 lb (36.3 kg)	73 lb (33.0 kg)	67 lb (30.2 kg)	62 lb (27.9 kg)	57 lb (25.9 kg)
100 lb (45.4 kg)	91 lb (41.2 kg)	83 lb (37.8 kg)	77 lb (34.9 kg)	71 lb (32.4 kg)

When to see a vet

A score of 8 or 9: obesity at this level needs a supervised plan and a check for underlying disease.
A score of 3 or below, or any dog losing weight without a diet change — thinness is a symptom before it is a feeding question.
Weight changing faster than 1–2 % a week on any plan.
A dog above score 7 from a breed prone to obesity (Labradors, Beagles, Dachshunds, Pugs), where joint and metabolic problems follow quickly.

Formula and sources

Sources reviewed 18 September 2026. Each names the figure it supports.

The 9-point body condition score and the 10–15 % of body weight per point behind the ideal-weight rule — Laflamme D. P., "Development and validation of a body condition score system for dogs", Canine Practice 22(4), 1997; and "… for cats: a clinical tool", Feline Practice 25(5–6), 1997
The body condition score descriptors beside the selector (dog) — WSAVA Body Condition Score chart, dogs
The body condition score descriptors beside the selector (cat) — WSAVA Body Condition Score chart, cats
Safe weekly loss (dogs 1–2 %, cats 0.5–1 %) and planning the diet on the ideal weight — AAHA Nutrition and Weight Management Guidelines for Dogs and Cats, 2021
Healthy cat weight context and hands-on ideal body-condition guidance — WSAVA Cat Body Condition Scoring chart; reviewed19 October2026

This page is an educational estimate, not veterinary advice.

Frequently asked questions

What should my dog weigh?

Score the body condition on the 9-point scale, then divide today’s weight by 1 plus 0.1 for every point above 5 (or 1 minus 0.1 for every point below). A 66 lb dog at score 7 has an ideal weight of about 54.9 lb.

How do I body-condition score my dog?

Run your hands along the ribs: at an ideal 5 they are easy to feel under a thin layer of fat, like the back of your hand. From above there is a visible waist behind the ribs; from the side the belly tucks up. If you have to press to find ribs, the score is 6 or more; if you can see them, 4 or less. The WSAVA chart in the sources shows every score.

How fast can a dog lose weight safely?

About 1–2 % of body weight a week (AAHA 2021). A 30 kg dog with 5 kg to lose needs two to four months; faster loss costs muscle, not fat, and is harder to keep off.

How much should I feed a dog to lose weight?

Calories for the ideal weight, not the current one: the resting energy of the target weight times the WSAVA weight-loss factor (1.0). The dog food calculator’s weight-loss mode does that sum when you enter the ideal weight from this page.