Registration Step 2 MyMetabolism Hello , Please enter or edit your details below and remember to click save because these figures will be used by all the calculators on this site. You: Age Gender -Select- Male Female 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 carbohydrates I'm on a low-carbohydrate ketogenic diet (less than 10% carbs) Why do carbohydrates matter? Carbohydrates and the respiratory quotient When you burn carbohydrates inside a living cell, or in a fire, the volume of carbon dioxide produced is always exactly same as the volume of oxygen that was consumed. When you burn fat, however, inside a cell or in flames, the volume of carbon dioxide produced is only 70% of the volume of oxygen consumed. If you burn carbohydrates and fat simultaneously, the volume of carbon dioxide produced will be somewhere between 70–100% of the oxygen consumed, depending on the precise composition of the fuel mix. The volume of oxygen you are consuming at any moment is called your VO₂ and the amount you burn at your maximum metabolic rate is known as your VO₂MAX. The maximum amount of carbon dioxide you exhale per minute depends your VO₂MAX and also on the ratio of carbohydrates to fat you are burning. The ratio of the volume of CO₂ you exhale compared to the volume of oxygen you consume is called your respiratory quotient, or RQ for short. RQ = VCO₂ ÷ VO₂ Your respiratory quotient is a dimensionless number that is calculated by dividing your carbon dioxide production by your oxygen consumption, with both values in millilitres, or fluid ounces, or any other units of volume as long as they are both the same: Your resting metabolism: Display Gravimetric [mass] rate Volumetric rate Mass units metric (kg) imperial (lbs) Volume units metric (litres) imperial (fl oz) VO₂ VO₂ (ml/min) millilitres / minute VO₂ (fl oz/min) fl oz / minute VO₂ ( litres / hour ) litres / hour VO₂ ( gallons / hour ) gallons / hour VCO₂ VCO₂ (ml/min) millilitres / minute VCO₂ (fl oz/min) fl oz / minute VCO₂ ( litres / hour ) litres / hour VCO₂ ( gallons / hour ) gallons / hour O₂ mass O₂ mass ( mg / min ) milligrams / minute O₂ mass ( ounces / min ) ounces / minute O₂ mass ( grams / day ) grams / day O₂ mass ( ounces / day ) ounces / day CO₂ mass Mass CO2 (mg / min) milligrams / minute CO₂ mass ( ounces / min ) ounces / minute CO₂ mass ( grams / day ) grams / day CO₂ mass ( ounces / day ) ounces / day carbon exhaled Carbon (milligrams/min) milligrams / minute Carbon (ounces/min) ounces / minute Carbon (grams/day) grams / day Carbon (ounces/day) ounces / day Carbon (carats /min) carats / minute Carbon (carats /hour) carats / hour Energy kilojoules per day kilojoules / day Calories per day Calories / day You can edit your details later If you are human, leave this field blank. Save Metrics