How to use the Quiz: Protein Creatinine Ratio
Nutrition calculators estimate your body's energy and macronutrient needs based on physiological models. These are evidence-based starting points — individual variation means real needs may be 10–15% higher or lower.
How the math works
- BMR (Basal Metabolic Rate): calories your body burns at complete rest. Estimated by the Mifflin-St Jeor equation (most accurate for general populations) or Katch-McArdle if you know lean body mass.
- TDEE (Total Daily Energy Expenditure): BMR × activity multiplier. Most sedentary office workers are 1.2–1.4×; athletes in heavy training 1.7–2.0×.
- Macronutrients: protein preserves lean mass (0.7–1g/lb body weight is evidence-based for most goals); carbs fuel performance; fat supports hormones and fat-soluble vitamins.
Common calibration mistakes
- Overestimating activity level — most people select "moderately active" when their true TDEE puts them in the sedentary-to-lightly-active range.
- Tracking calories burned from exercise and adding them back to TDEE — the activity multiplier already accounts for exercise. Double-counting creates a surplus.
- Treating the output as precise. Use it as a starting point for 2–3 weeks, then adjust based on observed weight trend and energy levels.
Frequently Asked Questions
How accurate are the results?
The Quiz: Protein Creatinine Ratio applies a standard formula to your inputs — accuracy depends on how precisely you measure those inputs. For planning and estimation, results are reliable. For high-stakes or professional decisions, cross-check the output with a domain expert or primary source.
How often should I recalculate?
Recalculate every 4-6 weeks, or any time your weight changes by more than 5 lbs, your activity level shifts significantly, or you change your goal. Metabolic rate adapts to consistent deficits — recalibrating prevents a plateau.