Macro Calculator

Macro Calculator is a free browser-based tool that helps you calculate daily protein, carbs & fat with preset diet plans. It is part of ToolsMonk's medical tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.

This tool is especially useful for workflows such as setting daily macro targets for a diet or training plan, translating a calorie goal into protein/carb/fat grams, and adjusting macros for muscle gain, fat loss, or maintenance. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.

Macro Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.

Macro Calculator turns a daily calorie goal into protein, carbohydrate, and fat targets in grams, using a split you choose for your goal — the next step after setting calories with the TDEE Calculator.

Tracking macros rather than calories alone matters because the balance of nutrients shapes your results, not just the total. Protein in particular drives muscle retention and satiety, so two plans with identical calories but different protein can produce very different outcomes for body composition — which is why a deliberate split is worth setting.

The conversion uses each macro's calorie density (protein and carbs at 4 cal/g, fat at 9), so your chosen percentages become concrete gram targets. A balanced split sits around 30/40/30, higher protein suits cutting, and lower carb suits some preferences — but the consistent advice is to get adequate protein first, then divide the remainder.

Aim for consistency over time rather than hitting every gram daily; close-enough, sustained, beats perfect-but-brief. It's informational, not dietary advice, and your details never leave your browser. Pair it with the TDEE, BMR, and Calorie calculators for a complete nutrition plan.