Macro Calculator

What are macros and why track them?

Macronutrients—protein, carbohydrates, and fat—supply all dietary energy and drive performance, recovery, and body composition. Tracking macros helps you move beyond “calories only” by aligning your intake with your goals:

• Protein supports muscle repair, appetite control, and healthy aging.
• Carbohydrates fuel training and everyday activity; fiber supports gut health and satiety.
• Fat supports hormones, fat-soluble vitamin absorption, and long-term energy.

Our calculator converts calories into grams using standard energy values: 4 kcal/g for protein and carbs, 9 kcal/g for fat.

The tool comes with two modes

Calorie-Based mode

Already know the number of calories you want to eat? Enter your daily target and select a macro split. The calculator returns grams of protein, carbs, and fat—rounded for real-world tracking and reconciled so 4·protein + 4·carbs + 9·fat equals your calorie goal.

Measurement-Based mode

Not sure about calories? Provide age, height, weight, activity level, and goal to estimate your TDEE (Total Daily Energy Expenditure). The tool sets calories for maintenance, loss, or gain and then translates those calories into macros according to the split you choose. You can pick from established BMR equations (Mifflin–St Jeor, Harris–Benedict) or a lean-mass–based option (Katch–McArdle) when body-fat % is known.

Preset macro splits

• Balanced – A steady default for maintenance or general health; works for most mixed diets.
• High Protein – Helpful during fat loss or high-frequency training to support recovery and fullness.
• Low Carb – Useful when emphasizing fats and protein; pair with strength work and adequate fiber.
• Keto – Very low carbohydrate with high fat; specialized approach best used with clear intent and medical clearance when needed.

You can switch splits any time—the calculator instantly recalculates grams from the same calorie total.

How much protein do you need?

Effective daily ranges for many active adults fall around 1.6–2.2 g/kg of body weight (≈0.7–1.0 g/lb), with higher intakes on a calorie deficit or during intense training. If you prefer a ratio-based split, choose a preset; if you prefer a gram-per-kg target, use the calorie-based mode to reverse-engineer carbs and fats after you set protein.

Activity levels

When using Measurment-Based mode, you will be asked for your activity level. Pick the option that matches most days in an average week—not your best or worst day.

Inclusive notes on goals and physiology

Energy and macro needs are influenced by age, training volume, sleep, stress, and body composition. For transgender and non-binary users, hormone therapy and changes in lean mass can shift calorie and protein needs over time. The measurement-based mode allows you to estimate calories from your current stats and activity; revisiting your numbers every 4–8 weeks as your body changes will keep your plan aligned with your goals.

Safe planning and practical guardrails

• Very low calories: if a plan drops below about 1,500 kcal/day for adults, seek professional guidance and prioritize nutrient density.
• Fiber and micronutrients: aim for a fiber-rich diet and include fruit, vegetables, pulses, whole grains, dairy or alternatives, and quality fats.
• Training support: pair higher protein with resistance training; use carbs around workouts to support performance and recovery.
• Iterate: track weight, measurements, performance, and appetite; adjust calories ±5–10% if results deviate from expectations for 2–3 weeks.

How to use the macro calculator

1. Pick your mode – Calorie-based for a quick split, or Measurement-based to estimate calories from TDEE.
2. Select a macro split – Balanced, High Protein, Low Carb, or Keto.
3. Review the grams – Protein, carbs, and fat appear with copy-friendly values.
4. Apply and iterate – Log meals, train consistently, and adjust every few weeks based on progress.

If you choose weight loss or gain in measurement-based mode, the calculator applies a moderate calorie adjustment (e.g., ~–20% for loss or ~+10–15% for gain), which you can fine-tune from experience.