"An adult cat requires about 25 calories per pound of body weight."
https://www.hepper.com/how-much-should-i-feed-my-cat/
"So how much food does your cat need? That’s a question best answered by a professional, though recommendations range between 24 to 35 calories a day per pound, to keep cats at a normal, healthy weight."
https://www.webmd.com/pets/cats/features/mistakes-people-make-feeding-cats
"Use a cat calorie calculator to calculate resting energy requirements (RER). (Table 1):
Body weight (lbs) Body weight (kg) RER ( calories per day)
1 0.5 39
2 0.9 65
3 1.4 88
4 1.8 110
5 2.3 130
6 2.7 149
7 3.2 167
8 3.6 184
9 4.1 200
10 4.5 218
11 5 234
12 5.5 250
13 5.9 265
14 6.4 280
15 6.8 295
16 7.3 310
17 7.7 324
18 8.2 339
19 8.6 353
20 9.1 366
25 11.4 433"
https://www.petplace.com/article/cats/pet-health/how-to-calculate-your-cats-daily-calorie-intake/
"Have your veterinary healthcare team calculate the number of calories your pet needs per day. This number will depend on whether your pet is at an ideal weight or needs to lose or gain weight."
"General guidelines for safe weight loss in dogs are 3 to 5% body weight loss per month and about 0.5 pounds (0.25 kg) per month in cats (1 to 3% body weight)."
"The caloric needs of a particular pet may differ depending on such factors as lifestyle, genetics, activity level and medical conditions. Your pet will likely be fed fewer calories if you are attempting to reduce weight and improve fitness."
https://www.petobesityprevention.org/pet-caloric-needs/