Simulation

See How Raising Protein Reshapes Your Carbs and Fat

On a 2,000-calorie diet, raising protein from 20% to 30% adds about 25 g of protein (from 100 g to 125 g) and, holding fat at 27%, cuts carbs by about 31 g (from 133 g to 102 g). Fat stays near 60 g. The chart compares your macro grams before and after the change so you can see the tradeoff at a glance.

Results

Visualization

CalorieFig provides educational estimates only, using established nutrition formulas such as the Mifflin-St Jeor equation and standard macro calorie values (4 cal/g protein and carb, 9 cal/g fat). These tools do not diagnose any condition and are not medical or dietary advice. Individual needs vary. Consult a physician or registered dietitian before changing your diet.

How It Works

Macros are split by calories: protein and carbs are 4 calories per gram, fat is 9. For a given daily calorie total, grams of a macro = (calories x percent) / calories-per-gram. We hold fat percent fixed and compute carbs as the remainder (100 - fat% - protein%). Raising protein therefore shrinks the carb share while fat grams stay constant. The grouped bars show the gram totals at your starting and target protein percentages.

What Should You Do?

Shifting toward protein often helps with fullness and muscle retention during weight loss, but do not zero out carbs unless you have a reason; they fuel training and mood. Keep fat around 20-35% for hormone and vitamin absorption. Use this simulator to plan a realistic swap, then check that the new carb level still fits the foods you enjoy. Small steps (5% at a time) are easier to adapt to than big jumps.

Frequently Asked Questions

Why does fat stay the same?

The simulator holds your fat percentage fixed so you can isolate how protein and carbs trade off. You can change fat with its slider.

Are 4 and 9 cal per gram exact?

They are the standard Atwater factors used on nutrition labels; real values vary slightly by food but the estimate is solid for planning.

How high should protein go?

Many active people do well at 25-35% of calories. Very high protein is not harmful for healthy kidneys but adds little extra benefit.

What if protein plus fat exceeds 100%?

The calculator clamps carbs to zero in that case; in practice you would lower fat or protein to leave room for carbs.

Does this help with weight loss?

Only if total calories drop. Changing macro ratios at the same calorie total changes composition and satiety, not the scale.