Which Calculator Should You Use? A Quick Guide by Goal

There are thirty-plus calculators on this site, and a common reaction is "great... which one do I actually use?" The answer depends entirely on one thing: your goal. Fat loss, muscle gain, and maintenance each need a different first calculator and a slightly different chain after it. Here's the decision guide that points you straight to the right tool, no guesswork, no wasted clicks.

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Start here: pick your goal

Notice what every path has in common: TDEE first. Your maintenance calories are the hinge that everything else swings on. Get that, and the right next step is obvious.

If your goal is fat loss

You want to eat below maintenance, but not so far below that you lose muscle and your willpower. The chain:

1. TDEE Calculator, your maintenance line.
2. Calorie Deficit Calculator, subtracts a sustainable amount for steady fat loss.
3. Macro Calculator, splits the target with protein high to protect muscle.

Add the Protein Calculator if you want to nail your protein floor exactly. For the strategy behind it, see how to lose fat without constant hunger.

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If your goal is muscle gain

Now you want to eat above maintenance, but only slightly, so you add muscle without piling on fat. The chain:

1. TDEE Calculator, maintenance.
2. Lean Bulk Calculator, a controlled surplus tuned for muscle, not fat.
3. Protein Calculator, enough protein to actually build.

Muscle gain is the mirror image of fat loss: opposite calorie direction, same obsession with protein and progressive training.

If your goal is maintenance or recomposition

This is the simplest setup. Your TDEE is your target, the calories that hold your weight steady. Use the TDEE Calculator, then the Macro Calculator to keep your protein, carbs, and fat balanced. If you're chasing a recomp (losing fat and gaining muscle at once), sit at or just below maintenance, push protein high, and train hard, the Macro Calculator sets it up. More on that in body recomposition.

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A full walkthrough: from goal to plan in five minutes

Let's run the fat-loss path end to end so you can see how the tools hand off to each other.

1. TDEE Calculator. You enter your stats and it returns, say, 2,200 maintenance calories. That's the line your weight holds at.
2. Calorie Deficit Calculator. You apply a moderate 20% deficit and it sets your target at roughly 1,760 calories for steady fat loss.
3. Macro Calculator. It takes that 1,760 and splits it: protein high to protect muscle (around 130g), then carbs and fat filling the rest.

Three numbers, three tools, one coherent plan. You didn't guess your calories, didn't crash too low, and your protein is locked in. The same logic runs in reverse for muscle gain: TDEE, then a surplus, then protein. The tools are deliberately built to chain like this.

Common mistakes when picking a tool

A few patterns send people in circles before they've eaten a single planned meal:

• Starting with macros. Jumping to the Macro Calculator while guessing your calories is the classic error. Macros split a calorie target you haven't set yet. TDEE comes first, always.
• Confusing BMI with a calorie tool. BMI is a screening number for health, not a way to set how much you eat. It won't give you a calorie target.
• Picking the wrong direction for the goal. A deficit tool for muscle gain, or a bulk tool for fat loss, quietly works against you. Match the second step to the goal in the table above.
• Never re-running them. Your TDEE drifts as your weight changes. Re-check every 4-5kg so the whole chain stays accurate.

The one rule that ties it together

Whatever your goal: TDEE first, then the goal-specific step, then macros. Start with the TDEE Calculator below, read off your maintenance number, and follow the row in the table that matches what you want. Three calculators, five minutes, and you've got a complete, personalised target instead of a guess.