Macro Calculator

How to use Macro Calculator

1. Open Macro Calculator in your browser — it loads instantly and works offline once cached.
2. Enter your values in the input fields. Every field is labelled so you know exactly what to type.
3. The result updates automatically as you type — there is no "submit" round-trip to a server.
4. Adjust any input to compare scenarios and see how the outcome changes in real time.
5. Copy or note the result. Nothing you enter is stored or sent anywhere.

Why use Macro Calculator?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full health & fitness suite, so related macro tasks are one click away.

What people use Macro Calculator for

• Splitting a calorie target into protein, carbohydrate and fat.
• Setting macronutrient goals for a training plan.
• Checking whether a diet plan's macros are sensible.

Macro Calculator: limits and things worth knowing

• Protein and carbohydrate provide about 4 kcal per gram and fat about 9, so the same weight of fat carries more than twice the energy — which is why fat grams shift a plan quickly.
• Protein around 1.6-2.2 g per kg of bodyweight is the range most consistently supported for preserving muscle in a deficit; beyond that the additional benefit is small.
• Dietary fat below roughly 20% of calories can affect hormone production, so extreme low-fat splits carry a real cost.
• Total calories determine weight change; the macro split affects body composition, satiety and training performance.
• General information only, not dietary advice.

Is it private and secure?

Your privacy is built in. Macro Calculator runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Why Browser-Based Tools Are Safer for Your Files — Most online converters upload your files to a server. Client-side tools don't. Here's why that difference matters for privacy.