Protein · Carbs · Fat

Macro Calculator for Lean Bulk

Free macro calculator for lean bulk — calculate macros for lean bulk with a controlled surplus for clean muscle gain.

No signup required Lean bulk surplus built in Instant results

Enter your TDEE + 250–350 kcal lean bulk surplus — get your TDEE from the TDEE Calculator

Your daily macro targets
Protein
—
grams
 
Carbs
—
grams
 
Fat
—
grams
 
P
C
F
Protein Carbs Fat
Per-meal breakdown
Protein
—g
Carbs
—g
Fat
—g
Results are estimates for informational purposes only. Not medical advice. Consult a healthcare professional for personalised guidance.
A lean bulk surplus of 250–350 kcal produces 0.25kg of weight gain per week — mostly muscle with minimal fat when combined with resistance training.

How to Calculate Macros for Lean Bulk

A lean bulk uses a small calorie surplus of 250–350 kcal to build muscle with minimal fat gain. This macro calculator for lean bulk sets your protein, carbs and fat targets specifically for a lean bulking phase — giving you the fuel to build muscle without unnecessary fat accumulation.

To calculate macros for lean bulk follow these steps:

  1. Find your TDEE using the TDEE Calculator
  2. Add 250–350 kcal for your lean bulk target — this small surplus maximises muscle gain while minimising fat accumulation
  3. Set protein at 2g per kg bodyweight minimum
  4. Fill remaining calories with 45% carbs and 25% fat (standard muscle gain split)
Example — 75kg person, 2,500 kcal TDEE, lean bulk: Lean bulk target: 2,500 + 300 = 2,800 kcal
Protein (30%): 840 kcal ÷ 4 = 210g
Carbs (45%): 1,260 kcal ÷ 4 = 315g
Fat (25%): 700 kcal ÷ 9 = 78g

This macro calculator for lean bulk does all of this automatically — just enter your lean bulk calorie target and select Muscle Gain + Standard.

Lean Bulk vs Standard Bulk — Which Is Better?

A lean bulk uses 250–350 kcal surplus producing 0.25kg per week gain — mostly muscle with minimal fat.

A standard bulk uses 500 kcal surplus producing 0.45kg per week — faster but with more fat gain. Compare to the macro calculator for bulking to see the difference in your targets.

An aggressive bulk uses 750+ kcal surplus — fastest weight gain but significant fat accumulation.

For most natural lifters a lean bulk produces the best long-term body composition results. The slightly slower muscle gain rate is offset by not needing a long aggressive cut afterwards. The TDEE calculator for bulking can help you set the right calorie target for each approach.

Related Calculators

TDEE Calculator
Calculate your TDEE first, then add 250–350 kcal for your lean bulk calorie target.
Macro Calculator for Bulking
Compare standard bulk macro targets to your lean bulk split.
Macro Calculator for Muscle Gain
High-protein macro split for building lean muscle with a moderate surplus.
TDEE Calculator for Bulking
Surplus-focused TDEE tool with lean, standard and aggressive bulk calorie targets.

Frequently Asked Questions

What is a lean bulk?+
A lean bulk is a muscle building phase that uses a small calorie surplus of 250–350 kcal above TDEE to maximise muscle gain while minimising fat accumulation. Unlike an aggressive bulk which uses 500–750 kcal surplus, a lean bulk produces slower but cleaner gains. Use this macro calculator for lean bulk to get your exact targets.
How do I calculate macros for lean bulk?+
To calculate macros for lean bulk, add 250–350 kcal to your TDEE for your calorie target, then set protein at 2g per kg bodyweight, carbs at 45% of calories, and fat at 25%. The calculator above automates this — just enter your lean bulk calorie target and select Muscle Gain + Standard.
How fast should I gain weight on a lean bulk?+
On a lean bulk expect 0.25–0.35kg of total weight gain per week. This is slower than a standard bulk but a higher proportion of the weight gained will be muscle rather than fat. If you are gaining faster than 0.5kg per week on this calculator's targets reduce your surplus by 100 kcal and reassess.
How long should a lean bulk last?+
Lean bulks typically last 4–6 months. Because fat gain is minimal with a lean bulk you can often bulk for longer than a standard bulk before needing to cut. Lean bulk until body fat reaches 15% for men or 25% for women then take a short maintenance phase or cut before the next lean bulk.
Is a lean bulk better than a standard bulk?+
For most natural lifters yes. A lean bulk produces slightly slower muscle gain but far less fat accumulation meaning less time needed cutting afterwards. The overall body composition after a lean bulk and short cut is usually better than after an aggressive bulk and long cut. Calculate macros for lean bulk above and compare to your current approach.