Registration Step 2 MyMetabolism Hello This calculator estimates your resting O₂ consumption, CO₂ production and the mass of the carbon atoms you exhale at rest. The carbon in your exhaled breath holds the key to how much weight your body can lose in a single day. Your metrics: Age Gender -Select- MaleFemale Weight (lbs) lbs Weight (kg) kg Height (ft) ft Height (in) in Height (cm) cm Mass units kilograms pounds Length units centimetres feet / inches Diet -Select- My diet includes carbohydratesI'm on a low-carbohydrate ketogenic diet (less than 10% carbs) Why do carbohydrates matter? arrowup2 When you are burning carbohydrates, the volume of carbon dioxide produced is equal to the volume of oxygen you consume. When you burn fat, however, the volume of carbon dioxide is only 70% of the oxygen volume you consume. The ratio of CO₂ and O₂ volumes you produce and consume is called your respiratory quotient. The exact figure changes throughout the day depending on the mixture of carbohydrates, fat, protein and alcohol you are burning at any time. This calculator uses the widely accepted RQ values of 0.85 for a mixed diet and 0.75 for low-carb ketogenic diets. Your resting CO₂ production: substance mass volume O₂ consumption O₂ mass ( mg / min ) milligrams / min O₂ mass ( mg / min ) milligrams / min O₂ mass ( ounces / min ) ounces / min O₂ mass ( ounces / min ) ounces / min VO₂ (ml/min) millilitres / min VO₂ (ml/min) millilitres / min VO₂ (fl oz/min) fl oz / min VO₂ (fl oz/min) fl oz / min CO₂ production Mass CO2 (mg / min) milligrams / min CO₂ mass ( ounces / min ) ounces / min VCO₂ (ml/min) millilitres / min VCO₂ (fl oz/min) fl oz / min Carbon atoms exhaled Carbon (milligrams/min) milligrams / min Carbon (milligrams/min) kilograms per week Carbon (ounces/min) ounces / min Carbon (ounces/day) pounds per week Display units kg / litres lbs / fl oz Volume units metric imperial Section Midnight – – – 1 – – – 2 – – – 3 – – – 4 – – – 5 – – – 6 – – – 7 – – – 8 – – – 9 – – – 10 – – – 11 – – – Noon – – – 1 – – – 2 – – – 3 – – – 4 – – – 5 – – – 6 – – – 7 – – – 8 – – – 9 – – – 10 – – – 11 – – – If you are human, leave this field blank. Save Metrics Δ