Do the macro ratios change as I lose weight?

Yes — as your weight decreases, your TDEE drops and your protein target (body weight × 2g) decreases. Recalculate every 4–6 weeks during active weight loss.

Is this calculator suitable for athletes?

Yes, as a baseline. Elite athletes with very high training volumes may benefit from sport-specific dietitian consultation for precise periodization.

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Best Free Macro Calculator Online in 2026 — Protein, Carbs, Fat, No Sign-up

Sunil Kalikayi4/7/20264 min read

What the Calculator Outputs

Macro Calculator outputs: daily calorie target (from TDEE and goal), protein target in grams, carbohydrate target in grams, fat target in grams, and the macro split as percentages. It supports goals of weight loss, muscle gain, and maintenance.

How It Calculates Your Targets

1. Calculates TDEE using Mifflin-St Jeor. 2. Adjusts for goal (deficit for loss, surplus for gain). 3. Sets protein at 2 g/kg for loss/gain, 1.6 g/kg for maintenance. 4. Sets fat at 25–30% of calories. 5. Fills remaining calories with carbohydrates.

Adjusting for Dietary Preferences

The calculator supports low-carb and ketogenic macro distributions. Switching to a keto profile changes carb allocation to <50g and shifts remaining calories to fat. The protein target remains constant regardless of carb/fat distribution.