Nutrition math,
done honestly.
We built Macrocalculator because most calorie and macro tools online give you a number and nothing else — no formula, no explanation, no way to know if it’s actually right for you.
Why We Built This
Search “macro calculator” and you’ll find dozens of tools that spit out a number in three seconds and tell you nothing about where it came from. We didn’t think that was good enough. If a number is going to shape how you eat every day, you should be able to see exactly how it was calculated — not just trust a black box.
So we built Macrocalculator around one simple rule: every formula stays visible. The Mifflin-St Jeor equation, the activity multipliers, the goal adjustments — it’s all shown, not hidden behind marketing copy or an email paywall.
What We Stand For
Transparency
Every formula and number behind your results is shown, not hidden.
Free, Always
No signup walls, no premium tier, no email required to see your results.
Evidence-Based
Built on established, peer-recognized formulas — not guesswork or trends.
A Few Ground Rules
Our calculators are estimation tools, not medical advice. They’re built to give you an accurate, evidence-based starting point — the same equations used broadly across nutrition coaching and research. But no formula can account for every individual variation in metabolism, and your real-world results over a few weeks of tracking will always be more accurate than any calculator’s first guess.
If you have a medical condition that affects your nutrition needs, please talk to a registered dietitian or physician before making major changes based on any calculator — ours included.