How Many Calories to Gain Weight? Maintenance Maths by Hand
Work out the calories your body burns in a normal day (your maintenance), then eat about 300 to 500 kcal more than that. For most adults that means a gain of roughly 0.25 to 0.5 kg a week, and you check after two weeks whether the scale agrees.
In brief
- Step 1: estimate maintenance with a pen and a phone calculator.
- Step 2: add 300 to 500 kcal a day, from normal food.
- Step 3: weigh weekly; adjust after two weeks, never after two days.
- Doctor first: if you’re losing weight without a reason, or have diabetes, kidney or heart disease.
Prefer to listen? This post as a 2 min video · Watch the video
How many calories to gain weight? Apps give a number in one tap, but they hide the working, so you can’t tell when they’re wrong. Doing it by hand takes five minutes, and afterwards you’ll understand exactly which knob to turn. This guide belongs to our Desi Weight Gain series. If you want the weight-loss version of the same maths, it’s in how many calories to lose weight.
Before the maths: is your low weight a symptom?
Counting calories only makes sense once the body itself is ruled out. If weight has dropped without dieting, or you eat plenty and still can’t gain, see a doctor first. Thyroid problems, diabetes, TB, coeliac disease, worms, depression and eating disorders are all common causes, and each needs its own care.
Step 1: estimate your maintenance calories
Maintenance is the energy you burn in a day: breathing, digesting, walking to the bus, climbing stairs. Think of it as the fuel a car uses just to do its usual daily route. The widely used Mifflin-St Jeor equation estimates the resting part.
- Men: (10 × weight in kg) + (6.25 × height in cm) minus (5 × age) + 5.
- Women: (10 × weight in kg) + (6.25 × height in cm) minus (5 × age) minus 161.
- Multiply by activity: 1.2 if you mostly sit, 1.375 if you walk a fair bit or train 1 to 3 days a week, 1.55 for 3 to 5 active days, 1.725 for hard daily work or training.
- Round it: the answer is an estimate, so round to the nearest 50.
A worked example
Ali is 22, 175 cm and 55 kg, a student who walks a lot and does push-ups three evenings a week. Resting: 550 + 1,093.75 minus 110 + 5 = 1,538.75. Times 1.375 = about 2,116, so call it 2,100 kcal. That’s his maintenance.
Sara is 28, 160 cm and 44 kg, with a desk job. Resting: 440 + 1,000 minus 140 minus 161 = 1,139. Times 1.2 = about 1,367, so roughly 1,350 kcal.
Step 2: add a 300 to 500 kcal surplus
Ali aims for 2,400 to 2,600 kcal. Sara aims for about 1,650 to 1,850. Why not more? Because the body can only build muscle slowly. Pile on 1,000 extra a day and the scale rises fast, but mostly as belly fat and water, which is the opposite of what a thin person usually wants.
Start at the lower end if your appetite is small. A 300 kcal gap is just an extra roti with a teaspoon of ghee plus a banana. Easy to keep up for months, and months are what count.
The surplus that works is the one you can still eat on a busy Thursday in week nine.
Desi foods by katori: a calorie range guide
These are rounded ranges, because recipes, oil and portion sizes vary from home to home. Use them to find your extra 300 to 500, not to count every grain.
| Food and portion | Approx. kcal |
|---|---|
| 1 medium chapati, no ghee | 100 to 120 |
| 1 teaspoon ghee or oil | 40 to 45 |
| 1 katori cooked rice | 180 to 220 |
| 1 katori daal, home style | 150 to 200 |
| 1 katori chicken salan | 250 to 350 |
| 1 katori full-fat dahi | 120 to 150 |
| 1 glass (250 ml) cow’s milk, full fat | 150 to 170 |
| 1 glass buffalo milk | 220 to 260 |
| 1 boiled anda | 70 to 80 |
| 1 medium banana | 90 to 110 |
| Small handful peanuts (30 g) | 160 to 180 |
| 2 medium khajoor (dates) | 40 to 130, depending on size |
Three easy ways to add 300 to 450 kcal
- A glass of full-fat milk with a banana, plus a small handful of peanuts (roughly 400 to 460).
- One extra chapati with a teaspoon of ghee and an extra katori of daal (roughly 290 to 365), then a boiled egg (about 75 more).
- A katori of dahi with a sliced banana and a small handful (15 g) of chopped walnuts or almonds (roughly 310 to 360).
Full days built this way are laid out in our weight gain diet chart for men and diet chart for women.
Step 3: check after two weeks and adjust
Weigh once a week, same day, same time, after the toilet and before breakfast. Day-to-day readings jump by a kilo on salt, water and what’s still in your gut. That’s noise.
- Gained 0.5 to 1 kg over two weeks: perfect. Keep going.
- Gained nothing: add another 200 to 250 kcal a day and check again in two weeks.
- Gained more than 1.5 kg in two weeks: much of it is probably water or fat. Trim 200 kcal.
- Still nothing after four weeks of honest eating: see a doctor, because this is exactly the “can’t gain despite eating” signal.
Myth: you need 1,000 extra calories a day to gain
Bulking talk online often says to “eat big.” A kilo of body tissue does hold a lot of energy, but muscle builds slowly whatever you eat. Push the surplus far past what muscle can use and the extra is stored as fat, often around the waist. The honest pace is 0.25 to 0.5 kg a week; anything promising 5 kg in 15 days is mostly water or, in unlabelled “gainer” powders, hidden steroids.
If you have diabetes, kidney disease or heart disease, your doctor or a dietitian should adjust any gain plan, because extra carbohydrate, protein, potassium or salt can matter. On insulin or sulfonylurea tablets, a change in eating can shift sugars, so check first and never change a medicine yourself. Teenagers don’t count calories at all: they eat family meals and see a doctor about growth. Pregnant and breastfeeding women follow their own doctor’s plan.
Did you know?
A small part of the energy in food is spent just digesting it. Protein costs the body the most to process, fat the least. That’s one reason a gain made only of oily snacks lands faster as fat than one with daal, eggs, dahi and chicken spread across the day.
Calorie questions people ask about weight gain
How many calories should I eat to gain weight?
About 300 to 500 kcal a day above your maintenance. For many thin young men that lands around 2,400 to 2,800 kcal, and for many thin women around 1,700 to 2,100, but your own sum is more accurate than any average.
How many calories are in 1 kg of body weight?
Fat tissue holds roughly 7,000 to 7,700 kcal per kilo, and muscle much less because it’s mostly water. Real gain is a mix, so treat the scale, not a formula, as the judge.
Is 3,000 calories a day enough to gain weight?
For a very active or tall man it might be about right; for a small, desk-bound woman it’s far more than needed. Work out your own maintenance first.
How fast should I gain weight?
About 0.25 to 0.5 kg a week for most adults. Faster gain is mostly fat and water.
Do I have to count calories every day?
No. Count for a week or two to learn your portions, then just repeat the meals that worked and weigh weekly.
Why am I not gaining weight even after eating more?
Usually the extra is smaller than it feels, or it’s skipped on busy days. Log two honest weeks; if the scale still won’t move after four, see a doctor.
How many calories are in one roti?
A medium chapati is roughly 100 to 120 kcal plain. A teaspoon of ghee on it adds about 40 to 45.
Is buffalo milk better than cow’s milk for weight gain?
It has more fat, so more calories per glass, roughly 220 to 260 against 150 to 170. Both work; choose what suits your stomach.
I have diabetes. Can I use this calorie method?
Only with your doctor or dietitian, who will fit the extra calories to your sugars and medicines. Don’t change any medicine on your own.
Should a teenager count calories to gain weight?
No. Teenagers should eat regular family meals, and a doctor should check their growth chart. Calorie counting can tip young people into worry about food.
Can I eat junk food to reach my calories?
You can, but gain from chips and sweets tends to settle as belly fat. Build most of the surplus from milk, daal, eggs, dahi, nuts and rice, with a treat now and then.
What if I have no appetite?
Eat smaller meals more often, drink milk rather than water with snacks, and add calorie-dense foods like nuts and ghee. Poor appetite that won’t lift deserves a doctor’s look.