How this calculator works
This tool is calorie-first. It does not start from a fixed fat-to-protein ratio. Instead it works in a clear order so the numbers always add up:
- Maintenance calories (TDEE). Your basal metabolic rate is estimated with the widely used Mifflin-St Jeor equation, then multiplied by your activity level.
- Calorie target. For fat loss the target is set roughly 18% below maintenance, for muscle gain about 10% above, and for maintenance it matches your TDEE. If you select pregnant or breastfeeding, a general energy allowance is added on top.
- Protein. Protein is set from your body size and goal (about 1.8–2.2 g per kg), using a capped reference weight so very high body weights don't produce extreme protein figures, with an upper limit of 220 g per day.
- Fat. Fat fills the calories that remain after protein. Your carnivore style nudges it up or down slightly, with sensible floors and ceilings so the result is never near-zero fat or implausibly fat-heavy.
- Fat-to-protein ratio. The ratio you see is the result of the above, not the driver. Most carnivore eaters land somewhere between roughly 0.7:1 and 2:1 by grams, depending on goal and how lean their food is.
The numbers are a starting point, not a prescription. Adjust by how you feel, your energy, and your bloodwork over a few weeks. Hunger and results matter more than hitting a gram target exactly.
Ready to turn these targets into meals? Use the Carnivore Meal Planner to build a 1-, 3-, or 7-day plan with portions and a shopping list.
What is a good fat-to-protein ratio on carnivore?
There is no single "correct" ratio. People doing carnivore for fat loss often sit nearer 1:1 by grams, while those eating fattier cuts for satiety or a more ketogenic approach sit higher, around 1.5:1 to 2:1. Leaner eaters and those eating very fatty cuts sit at opposite ends. The right ratio is the one that keeps you satisfied, energetic, and moving toward your goal.
Key takeaways
- Calories are anchored to your real energy needs, so protein and fat always reconcile with your target.
- Protein is capped so large or small inputs still produce sensible figures.
- The fat-to-protein ratio is an output you can adjust, not a fixed rule.
- Pregnancy and breastfeeding add energy needs and are not the time for calorie restriction.
- Use the result as a starting point and refine by how you feel.
Frequently asked questions
How much protein should I eat on a carnivore diet?
A common range is about 1.6–2.2 g of protein per kg of body weight, higher when losing fat to protect muscle and a little lower at maintenance. This calculator uses that range and caps the total so the figure stays realistic.
Why are my fat grams so high?
Fat fills the calories left after protein, so a higher calorie target relative to your protein pushes fat grams up. If that feels like too much food, choose a leaner carnivore style or a smaller deficit to bring it down. For guidance on a target ratio, see "What is a good fat-to-protein ratio on carnivore?" above.
Does this account for pregnancy or breastfeeding?
Yes. Selecting breastfeeding adds roughly 450 kcal per day and pregnancy about 300 kcal, shown in the calorie note. These are general averages; your needs vary by stage, so confirm with your clinician.
Does the calculator use BMI?
No. It estimates energy needs from your sex, age, height, weight, and activity, not from BMI. BMI is not used to judge your body or set your macros.
Is this medical advice?
No. It is a general educational estimate. It cannot account for your individual medical situation. Speak with a qualified doctor or registered dietitian before changing your diet, especially with any health condition.
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