Quirkulator

Nutrition & Energy Calculators

19 calculators covering metabolic rate, energy needs and macros, each with its formula and worked examples.

Nutrition & Energy Calculators brings together 19 calculators for metabolic rate, energy needs and macros, including Alcohol Units Calculator, Bulking Calories Calculator, Calories Burned Running Calculator and Cutting Calories Calculator.

These are separate pages rather than one tool with a mode switch because the inputs differ, the interpretation differs, and the question behind each one is different. Each page opens with the formula it uses, defines every variable, and walks the calculation through real numbers before you type anything.

All 19 pages compute in your browser: nothing you type is sent anywhere, and results update as you edit. Each one carries worked examples, interpretation bands where a score needs context, and a FAQ answering what people actually ask about that calculation.

The collection is part of Health & Fitness, and every page links to the neighbouring calculations you usually need next.

19 pages in this collection

BMR CalculatorBasal metabolic rate from Mifflin-St Jeor, with Harris-Benedict alongside for comparison.Alcohol Units CalculatorUK units and US standard drinks from volume and ABV, with the weekly guideline for context.BAC Estimate CalculatorBlood alcohol concentration by the Widmark equation, as an illustration rather than a fitness test.Bulking Calories CalculatorA lean-gain surplus sized to a target rate, showing how much of the gain is likely to be fat.Caffeine Half-Life CalculatorHow much caffeine remains hours after a drink, using first-order decay with a 5-hour half-life.Calorie Deficit CalculatorTurn a daily deficit into a weekly rate of loss using the 7,700 kcal per kilogram rule.Calories Burned Cycling CalculatorCycling energy cost from Compendium MET values at each speed, effort and grade.Calories Burned Running CalculatorRunning energy cost by pace, using Compendium MET values from 6.0 up to 19.0.Calories Burned Swimming CalculatorSwimming energy cost by stroke and effort, from the Compendium MET values of each stroke.Calories Burned Walking CalculatorWalking energy cost from the Compendium MET values for each pace and gradient.Carb Cycling CalculatorHigh, moderate and low carbohydrate days that average out to your weekly calorie target.Cutting Calories CalculatorSet a cutting intake as a percentage of maintenance, with a protein floor to protect lean mass.Fibre Intake CalculatorDaily fibre target from calorie intake at 14 g per 1,000 kcal, with the adult reference range.Macro Split CalculatorSplit a calorie target into grams of protein, fat and carbohydrate at 4/9/4 kcal per gram.MET Calorie CalculatorTurn any MET value from the Compendium into kilocalories for your weight and time.Protein Intake CalculatorDaily protein in grams from body weight and goal, from the RDA floor up to 2.2 g/kg.TDEE CalculatorTotal daily energy expenditure — BMR multiplied by an activity factor.Water Intake CalculatorDaily fluid from body weight at 30-40 ml per kilogram, plus a sweat allowance for training.Weight Loss Timeline CalculatorHow many weeks to reach a goal weight at a given deficit, with the slowdown built in.

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