Which calculator for which situation
- Diet and macros. Calories and macros splits the daily total between protein, carbohydrate and fat; macros adjusts the distribution; daily protein computes the target per unit of body weight.
- Cooking. Recipe scaling adjusts quantities up or down; kitchen measures converts cups, spoons and grams.
Volume and weight are not interchangeable
This is the error that ruins the most recipes. A cup of flour has no fixed weight — it depends on how the flour got into the cup. Flour scooped from the bag can weigh up to 20% more than flour spooned in and levelled, and in a cake that changes the texture completely.
The same cup holds 85 g of cocoa and 227 g of butter. There is no single cup-to-gram conversion: it changes with the ingredient's density.
That is why professional baking measures by weight. Without a scale, use the spoon-and-level method: fluff the flour with a fork, spoon it into the cup without packing, and level with the back of a knife. Never scoop the cup through the bag.
Scaling a recipe is not multiplying everything
Doubling works well for ingredients that make up mass and volume, and badly for three categories:
- Salt and strong seasonings. Perception is not linear — doubling usually overshoots. Start at 1.5× and adjust by tasting.
- Baking powder and soda. The right proportion depends on batter depth and pan shape too. Doubling blindly can make a cake rise and then collapse.
- Oven time and temperature. They do not scale along. A batter of twice the volume does not bake in twice the time, because heat enters through the surface and surface area does not grow in step with volume. Baking in two smaller pans is usually more reliable than doubling the depth.
Protein: the range the literature supports
For active people the commonly recommended range is 0.7 to 1.0 g per pound of body weight per day, with the upper end mattering most in a calorie deficit — when preserving lean mass counts for more. Below roughly 0.55 g/lb, muscle preservation worsens while dieting; above 1.0 g/lb, studies do not show consistent additional benefit for that goal.
The usual caveat applies: these are population references. Kidney conditions, pregnancy, older age and clinical goals change the recommendation, and in those cases professional guidance is not optional.
Frequently asked questions
How do I split my macros? Set protein first (from body weight) and fat at a healthy minimum — around 0.35 g per pound. Carbohydrate fills whatever the calorie total leaves. That order protects what has a function and leaves flexible what is adjustable.
Do I have to count calories forever? No. Counting for a few weeks calibrates portion perception — almost everyone underestimates intake by 20% to 30%. After that, most people hold results with simple rules and weekly weigh-ins.
Is a tablespoon always 15 ml? In recipes, yes by convention. The spoon in your drawer may hold anywhere from 10 to 20 ml — which is why measuring spoons exist, and why they matter for leavening and salt.
Are the nutrition values here exact? They are estimates from composition tables. Foods vary with variety, cut, preparation and brand; use the numbers to plan, not to audit.