Keto Macro Calculator

A ketogenic diet works by keeping carbohydrate low enough that the liver starts converting fat into ketone bodies, which then become a significant fuel for the brain and muscles. The threshold varies between people, but most adults enter nutritional ketosis somewhere between twenty and fifty grams of net carbohydrate a day. Net carbohydrate means total carbohydrate minus fibre, since fibre is largely not digested.

The classic split is seventy-five per cent of calories from fat, twenty from protein and five from carbohydrate. What matters more than the exact percentages is that protein is kept adequate but not extreme: too little protein risks muscle loss, while very large amounts can, in some people, supply enough glucose to slow the transition into ketosis. Fat then fills the remaining calories, which is why a ketogenic diet is not a high-protein diet as commonly described.

Converting percentages into grams needs the energy values: fat has nine kilocalories per gram, protein and carbohydrate four each. At two thousand calories a day, a standard split gives about 167 grams of fat, 100 grams of protein and 25 grams of net carbohydrate. Notice how small the carbohydrate allowance is in food terms — a single large banana would use most of the day's budget.

There are real cautions. In the first week or two, many people experience headache, fatigue and cramping — often called keto flu — which usually responds to adequate fluid, sodium, potassium and magnesium. People with type 1 diabetes, kidney disease, liver disease, pancreatic disease or a history of disordered eating should not start a ketogenic diet without medical supervision, and those on insulin or sulfonylureas need dose adjustments that only a doctor can make. Constipation, raised LDL cholesterol in some individuals and reduced exercise performance in high-intensity athletes are all commonly reported. Keto is a legitimate therapeutic and weight-management tool for some, but it is a significant dietary intervention rather than a casual choice, and this calculator is general information rather than medical or dietary advice.

This calculator returns estimates for general information only. It is not medical advice, diagnosis or treatment, and it cannot replace an assessment by a qualified health professional. Individual results vary, and figures such as calorie needs, body-fat percentage and heart-rate zones are approximations based on population averages rather than measurements of you.