Question 1

How many calories should I eat to gain weight?

Accepted Answer

Eat 250–500 kcal above your TDEE (Total Daily Energy Expenditure) to gain roughly 0.5 kg per week in a healthy, mostly-muscle way. For example, if your TDEE is 2,200 kcal, eat about 2,700 to gain 0.5 kg/week. The calculator above works out your exact surplus from your weight, height, age and activity.

Question 2

How many calories should a woman eat to gain weight?

Accepted Answer

Women typically maintain on 1,800–2,200 kcal/day. To gain weight, add a 250–500 kcal surplus → roughly 2,100–2,700 kcal/day, gaining about 0.1–0.45 kg per week. Because women have lower average muscle mass, their TDEE is 5–10% below a man of the same size, so a smaller surplus goes further — use the calculator and select "Female" for your exact figure. Pair it with resistance training so the gain is muscle, not just fat.

Question 3

What formula does this weight gain calculator use?

Accepted Answer

It uses the Mifflin-St Jeor equation (1990) for BMR, multiplies by your activity factor for TDEE, then adds a surplus. Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5. Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161. Target calories = TDEE + surplus (250/500/750 kcal).

Question 4

How long does it take to gain 5 kg or 10 kg?

Accepted Answer

At a 500 kcal/day surplus (0.5 kg/week): 5 kg takes ~10 weeks, 10 kg takes ~20 weeks (~5 months). At 750 kcal/day (0.75 kg/week): 5 kg in ~7 weeks. Gaining more slowly (250 kcal) means less fat gain — ideal for "lean gain". Real results vary ± 10–15% by metabolism and genetics.

Question 5

Mass gainer vs whey protein — which is better to gain weight?

Accepted Answer

A mass gainer (e.g. VitaXtrong Hulk, BS Nutrition M16) packs 1,000–1,500 kcal plus high carbs per serving — ideal if you're a hardgainer who struggles to eat enough. Whey/soy protein (e.g. Shaklee ESP) is ~120 kcal and high protein — best for lean gain, where you get calories from food and use protein to build muscle. Skinny hardgainer: pick a mass gainer. Already eating enough, want muscle: pick whey/protein.

Question 6

How do I gain weight without gaining too much fat?

Accepted Answer

The key to "lean gain": (1) keep the surplus small — 250–500 kcal/day, not 1,000; (2) eat high protein (1.6–2.2g per kg body weight); (3) do resistance training (gym, weights) 3–4× a week so the surplus builds muscle; (4) choose nutrient-dense foods (rice, chicken, eggs, nuts, avocado) over sugary snacks. Without resistance training, most of the added weight becomes fat.

Daily Surplus	Gain/Week	Time to Gain 5 kg	Best For
250 kcal/day	~0.25 kg	~20 weeks	Lean gain — least fat gain
500 kcal/day	~0.5 kg	~10 weeks	Recommended — muscle vs fat balance
750 kcal/day	~0.75 kg	~7 weeks	Hardgainer / ectomorph
1,000 kcal/day	~1 kg	~5 weeks	Dirty bulk — heavy fat gain

Profile	BMR	TDEE (lightly active)	Target (+400)
Woman, 24y, 45 kg, 158 cm	1,209 kcal	1,663 kcal	2,063 kcal
Woman, 30y, 50 kg, 162 cm	1,283 kcal	1,764 kcal	2,164 kcal

Calories per serving	~1,500 kcal
Protein	60g / serving
Use	Hardgainer / hard to gain weight
Shopee sales	8,000+ units
Price	RM149.00

Monthly	10 yrs	20 yrs	30 yrs
RM300/mo	RM61k	RM228k	RM678k
RM500/mo	RM102k	RM380k	RM1.13M
RM531/mo	RM109k	RM404k	RM1.2M

Calorie Calculator to Gain Weight Malaysia

How a Calorie Surplus Works for Weight Gain

Calorie Calculator for Women to Gain Weight

Mass Gainers to Help Hit Your Surplus

Lean Gain vs Dirty Bulk — Which Is Better?

RM500/Month for 30 Years = RM1.13M — via S&P 500 at 10% p.a.

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Calorie Calculator to Gain Weight — FAQ