Macro Calculator – Estimate Daily Protein, Carbs and Fat
Find your daily calories and protein, fat and carb targets by goal and activity.
About the Macro Calculator
What is the Macro Calculator?
A macro calculator sets your daily calorie target and splits it into grams of protein, fat and carbohydrates based on your goal.
Why use this calculator?
Counting calories alone works, but hitting protein and fat targets keeps you full, preserves muscle and makes the plan sustainable.
How to use it
- Enter your age, height, weight and gender.
- Choose your activity level, then your goal.
- Read your calorie target and macro gram targets.
- Use a food-tracking app to aim for these numbers.
Formula
Calories = BMR × activity factor ± goal adjustment.
These are starting points. Adjust after 2–4 weeks based on how your weight and energy actually respond.
Frequently Asked Questions
How much protein do I really need?
For most active people, 1.6–2.2 g per kg of body weight supports muscle. Higher intakes have little added benefit.
Do I need to count macros forever?
No. Most people track for a few weeks to learn portion sizes and then drift to intuitive eating with occasional check-ins.
Is this a medical diagnosis?
No. This tool provides general wellness information only. It is not a substitute for evaluation by a qualified healthcare professional.
Why do results differ from my doctor's measurements?
Clinical measurements use calibrated equipment and professional technique. Home estimates rely on formulas and self-reported values, so small differences are normal.
How often should I recalculate?
Recheck after meaningful changes such as weight gain or loss, a new workout routine, or every few months to track trends over time.
Do these formulas apply to everyone?
Most population formulas are less accurate for athletes, pregnant people, very young children and the elderly. Use them as a general guide.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.