Flexible dieting (IIFYM) works by hitting daily macro targets regardless of food choices.
Protein: 4 kcal/g. Carbs: 4 kcal/g. Fat: 9 kcal/g. Set protein first, then divide remaining calories.
This tool is most useful for tracking trends rather than obsessing over a single data point. Run the calculation monthly with consistent measurement conditions to see whether your metric is moving in the right direction.
A frequent error is failing to control measurement conditions between calculations. Weight and body circumferences vary significantly throughout the day and with hydration levels. Always measure under the same conditions (same time of day, same equipment) to make comparisons meaningful.
Someone returning from a period of inactivity uses the calculator to establish a baseline health metric before starting a new training programme. Monthly recalculations with consistent measurement conditions create a trackable trend that scale weight alone cannot provide.
Multiply calorie % by total calories then divide by calories per gram (4 for protein/carbs, 9 for fat).
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