Weight Change From Surplus
Calculator
Results
- Total calorie surplus (kcal)
- 9,000
- Weight change (kg)
- 1.168831
- Weight change (g)
- 1,168.831168
Nutrition results
| Total calorie surplus (kcal) | 9,000 |
| Weight change (kg) | 1.168831 |
| Weight change (g) | 1,168.831168 |
formula-map diagram
- Total calorie surplus (kcal)
- 9,000
- Weight change (kg)
- 1.168831
- Weight change (g)
- 1,168.831168
Nutrition formula map
Formula
kg gained = (daily surplus kcal × days) ÷ 7700 kcal/kg= 9000
Note
Simplified nutrition model using standard reference constants (protein and carbohydrate 4 kcal/g, fat 9 kcal/g, alcohol 7 kcal/g, 1 kg of body fat about 7700 kcal, salt to sodium factor 0.393). Real energy needs and body composition changes vary between individuals. This is not medical, dietetic or nutritional advice; consult a qualified health professional before changing your diet.
More in Nutrition and diet
See all →Frequently asked questions
How is expected weight gain calculated from a calorie surplus?+
The calculator applies the same approximate energy-density conversion used for weight loss in reverse: about 3,500 extra calories consumed above maintenance corresponds to roughly one pound (0.45 kg) of weight gain, scaled by the surplus size and duration you enter.
Does a calorie surplus always produce fat gain?+
No — with adequate protein intake and resistance training, a portion of a surplus can go toward building muscle tissue rather than only fat, so the composition of weight gained depends heavily on training stimulus and diet quality, not just the surplus size.
Why do 'bulking' surpluses vary so much in recommended size?+
A larger surplus speeds visible weight gain but increases the fat-to-muscle ratio of that gain, while a smaller, more conservative surplus gains weight more slowly but with a higher proportion of muscle — the right size depends on training experience and how much fat gain someone is willing to accept.
Is the weight gain rate linear over long periods?+
No, as with weight loss, the relationship is only approximately linear over shorter periods — metabolic rate rises somewhat with increased body weight and food intake, meaning the same surplus tends to produce a smaller rate of gain over time unless the surplus is increased.
How accurate is this for predicting muscle gain specifically?+
This estimates total body weight change from an energy surplus, not muscle gain specifically — actual muscle growth rates are capped by physiological limits (much slower than fat gain potential), so at typical surplus sizes a meaningful share of gain beyond those limits will be fat, not muscle.