How many calories does a neutered adult Mastiff need?

At 175 lb, the verified feeding table lists 2979 kcal per day for a Mastiff (resting energy 1862 kcal times a factor of 1.6).

How many calories does an intact adult Mastiff need?

At 175 lb, the verified feeding table lists 3351 kcal per day for a Mastiff (resting energy 1862 kcal times a factor of 1.8).

How many calories does a Mastiff puppy under 4 months need?

At 175 lb, the verified feeding table lists 5586 kcal per day for a Mastiff (resting energy 1862 kcal times a factor of 3).

How many calories does the weight-loss row list for a Mastiff?

At 175 lb, the verified feeding table lists 1862 kcal per day for a Mastiff (resting energy 1862 kcal times a factor of 1).

Feeding calculator

How much to feed a Mastiff

A 175 lb Mastiff is the starting weight on this calculator, taken from the verified adult range (160–230 lb (male), 120–170 lb (female)).

Last reviewed November 1, 2026.

Daily portion

Dog food calculator: 2681 kcal; 7.66 cups · 919 g · 2 meals
Merck chart, Adult, neutered: 2979 kcal; Resting energy 1862 kcal × 1.6, before the calculator's activity and size adjustment.

Lifespan6–10 years

Weight160–230 lb (male), 120–170 lb (female)

SizeGiant GroupWorking Group

Resting energy at that weight is about 1862 kcal per day. The Merck neutered-adult factor of 1.6 puts maintenance near 2979 kcal before activity is added. The dog food calculator on this page uses that same resting-energy formula, then applies the activity and size adjustments from the main dog food calculator.

Reading the portions

Compared with other single-size giant breeds, that neutered-adult portion is 790 kcal higher than the 2189 kcal for an average giant breed at 116 lb.

Portions are a starting estimate. Mastiff individuals can vary by body condition, neuter status, and how much they work. Adjust the bowl from what you see on the ribs, not from the table alone.

Feeding table from the verified weight chart

RER=70*kg^0.75; MER=RER*factor. Starting estimate only; individuals vary up to 50%; adjust by body condition

Mastiff adults maintenance energy

Swipe sideways to read every column.

Weight	RER	Adult, neutered	Adult, intact	Puppy under 4 months	Puppy 4 months and older	Weight loss
119.9 lb (54.4 kg)	1402 kcal	2243 kcal	2524 kcal	4206 kcal	2804 kcal	1402 kcal
147.5 lb (66.9 kg)	1637 kcal	2620 kcal	2947 kcal	4912 kcal	3275 kcal	1637 kcal
175 lb (79.4 kg)Current weight	1862 kcal	2979 kcal	3351 kcal	5586 kcal	3724 kcal	1862 kcal
202.4 lb (91.8 kg)	2076 kcal	3322 kcal	3737 kcal	6228 kcal	4152 kcal	2076 kcal
220.5 lb (100 kg)	2214 kcal	3542 kcal	3984 kcal	6641 kcal	4427 kcal	2214 kcal