Nutrition Tracker Calculator

This calculator bundles five separate nutrition and food-cost tools behind one mode selector, so it's worth understanding that each mode is a self-contained calculation using only its own inputs. The Calorie/Macro Counter mode applies the standard Atwater factors -- 4 calories per gram of protein, 4 per gram of carbohydrate, 9 per gram of fat -- and subtracts an estimate for fiber's lower usable-calorie contribution, since fiber isn't fully digested the way other carbohydrates are. The Caffeine Tracker mode sums typical caffeine content across common beverage and food sources and compares the total against the FDA's commonly cited 400 mg/day guideline for healthy adults; its "hours before sleep-safe" estimate uses caffeine's roughly 5.5-hour biological half-life applied to your average single-drink dose (total caffeine divided by number of drinks) rather than the full daily total, since real intake is spread across several drinks over the day rather than swallowed as one dose. The Sugar Analysis mode converts grams of sugar into teaspoon equivalents (about 4.2 g per teaspoon) and compares against the World Health Organization's guidance on free sugars (added sugars, honey, syrups, and fruit juice -- not sugars naturally present in whole fruit or plain dairy): a strong recommendation to stay under 10% of daily energy (about 50 g at 2,000 kcal) and a further conditional recommendation of under 5% (about 25 g).

The Meal Prep Cost mode compares the cost of every serving your batch-cooking produces against paying for an equivalent eating-out meal for each of those servings, netting out an optional hourly value of your own prep time. The ABV Calculator mode estimates alcohol by volume and weight from original and final specific gravity readings using the standard simple ABV formula, along with apparent/real attenuation and an estimate of calories per serving derived from the Balling real-extract formula. None of these modes' outputs mix with each other -- switching modes changes which inputs and outputs are active, but the underlying formulas stay independent.