Lean Bulk Calculator

A lean bulk aims to build muscle while minimising fat gain by using a controlled calorie surplus. This calculator determines your maintenance calories, then adds the optimal surplus based on your training experience (beginners can gain faster), and provides precise macro targets emphasising protein for muscle synthesis.

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Sex

malefemale

Age

Height

Weight

Activity Level

Training Experience

Current Body Fat % (optional)

Used for "when to stop bulking" guidance

Muscle Building

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Frequently Asked Questions

What is a lean bulk?

A lean bulk is a controlled calorie surplus (typically 200-500 calories above maintenance) designed to build muscle while minimising fat gain. Unlike a 'dirty bulk' with unlimited calories, a lean bulk is strategic and produces a better muscle-to-fat gain ratio.

How big should my calorie surplus be?

Beginners: 300-500 cal surplus (can build muscle faster). Intermediate: 200-350 cal surplus. Advanced: 150-250 cal surplus (diminishing returns require smaller surplus). Larger surpluses don't build more muscle — they just add more fat.

How much protein do I need for bulking?

Research supports 1.6-2.2g of protein per kg of bodyweight for muscle building. Higher protein intake (up to 2.2g/kg) may be beneficial during a bulk to maximise muscle protein synthesis, especially when training hard.

How long should a bulk last?

A lean bulk typically lasts 3-6 months. Aim to gain 0.25-0.5% of bodyweight per week (roughly 0.5-1kg/month for most). If body fat exceeds 15-17% (men) or 25-27% (women), consider transitioning to a cut.

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