By caloric content… but I wouldn’t worry too much on the macros.
If you limit carbs to 20 gr.
And you keep proteins between 1.0 and 1.5 gr. Per kg of lean body weight
And eat fat to satiety.
You will be in ketosis.
Depending on the amount of calories of fat requires you to reach satiety on a given day, the % of macro will vary and that is perfectly fine.
Restricting calories to be exactly where you want to be %-wise on the macros invariably forces you to either over-eat or under-eat.
TLDR
Here’s why I say this:
Say you have 70 kg of lean body mass and you want to be on the higher end for proteins, you must then consume +/- 100 gr of proteins.
So carbs = 20 gr = 80 cal
Proteins = 100 gr = 400 cal
Total = 480
(Assuming you’re looking for macro ratio of 75/20/5)
That means you need 1920 cal from fat (or +/- 200 gr)
For a total of 2400 cal (1920 + 400 + 80) (75 / 20 / 5)
You will be fine with that, but every single day, every single meal, you will either eat a little more or a little less than you would have really felt like eating. (sometimes it could be a lot more or a lot less)
Being Keto makes you SO MUCH more capable to hear when your body has been properly fueled and when it hasn’t.
You no longer need to monitor your intake to make sure you don’t over or under-eat, you need only eat when hungry, and stop when full.
Anything else is probably sub-optimal … ‘especially’ relying on some hard calculated calorie number that does not take into account the 1000s of variables that affect your “in the moment” calorie expenditure.
But your body know, and when you squelch the noise that carbs craving makes…. you can hear your body just fine.
And if you DO happen to over-indulge (on Keto food of course) and over-eat, say 1000 calories.
You can bet that your body won’t bother you for fuel for many hours, most likely skipping a meal or two.
