What Is the Best Free App for Weight Gain?

FatSecret is the best completely free app for tracking a weight gain calorie surplus, offering unrestricted calorie and macro tracking with daily and weekly views. For the most comprehensive weight gain support including surplus consistency tracking, calorie floor alerts, and AI-powered meal suggestions from a verified recipe library, Nutrola provides the best value at 2.50 euros per month after a free trial.

The calorie tracking app market is overwhelmingly focused on weight loss. Marketing copy talks about "losing weight," "cutting calories," and "reaching your dream body." But millions of people need the opposite: they need to gain weight, and it can be just as challenging as losing it.

Hardgainers with fast metabolisms, people recovering from illness or surgery, underweight individuals advised by their doctor to gain weight, athletes in a bulking phase, and elderly adults fighting muscle loss all need to track a calorie surplus rather than a deficit. We evaluated six apps to find which ones actually support this goal.

Weight Gain Feature Comparison Table: Free Tier

Feature	MyFitnessPal	Lose It	FatSecret	Cronometer	Yazio	Nutrola
Set weight gain goal	Yes	Yes	Yes	Yes	Yes	Yes
Surplus calorie calculation	Basic	Basic	Basic	Detailed	Basic	Detailed
Calorie floor alert (undereating)	No	No	No	No	No	Yes
Weight trend graph	Premium only	Yes	Yes	Yes	Premium only	Yes
Weekly calorie average	Premium only	Premium only	Yes	Yes	Premium only	Yes
High-calorie meal suggestions	No	No	No	No	No	Yes
Protein target for muscle gain	1 macro only (free)	Yes	Yes	Yes	Yes	Yes
Calorie-dense food highlights	No	No	No	No	No	Yes
Progress photos	Premium only	No	No	No	Premium only	Yes
Surplus consistency score	No	No	No	No	No	Yes
Price for full features	$19.99/mo	$39.99/yr	Free	Free / $5.99/mo	$6.99/mo	From 2.50 euros/mo

Why Weight Gain Tracking Is Different from Weight Loss Tracking

Weight loss and weight gain tracking have fundamentally different requirements, but most apps treat them identically by just flipping the surplus or deficit number.

The consistency problem

For weight loss, a single day of overeating is a setback. For weight gain, a single day of undereating is the setback. Hardgainers know this pain: you have a busy day, skip a meal, and suddenly you are 500 calories short of your surplus target. Repeat that 3 to 4 times per week and your bulk stalls completely.

Weight gain tracking needs a calorie floor alert, not just a ceiling. When you are trending under your daily target by early afternoon, the app should notify you so you can course-correct with a calorie-dense snack or larger dinner.

Only Nutrola offers calorie floor alerts. Every other app in this comparison only warns about eating too much, never too little.

The meal suggestion problem

When you need to eat 3,000 or 3,500 calories per day and you are stuck at 2,200 by dinner, you need specific suggestions for calorie-dense meals that fit your remaining macro targets. Generic advice like "eat more" does not help. You need a specific recipe that delivers 800 calories with 40 grams of protein.

Nutrola's AI meal suggestions fill this gap by recommending specific meals from its 500,000-plus recipe library that match your remaining calorie and macro needs for the day.

Who Needs a Weight Gain App

Weight gain is not just for bodybuilders. Several populations benefit from structured surplus tracking.

Hardgainers and ectomorphs

People with naturally fast metabolisms who struggle to eat enough calories. Studies show that self-reported "hardgainers" typically underestimate their calorie needs by 300 to 700 calories per day. Tracking makes the actual shortfall visible.

Post-illness or post-surgery recovery

Weight loss during illness or hospitalization can be significant. Doctors frequently prescribe weight gain plans for recovery, but patients rarely have tools to track compliance. A calorie tracking app set to a surplus goal provides structure during recovery.

Athletes in a bulking phase

Strength athletes, powerlifters, and bodybuilders periodically enter calorie surplus phases to build muscle. Effective bulking requires a moderate surplus (200 to 500 calories above maintenance) sustained consistently. Too little surplus means slow progress. Too much means excessive fat gain.

Underweight individuals

Adults with a BMI below 18.5 face increased health risks including weakened immune function, reduced bone density, and fertility issues. Structured weight gain with tracking ensures adequate nutrition rather than simply eating more junk food.

Elderly adults losing muscle mass

Sarcopenia affects an estimated 10 to 16 percent of adults over 65. Maintaining adequate calorie and protein intake is essential for slowing muscle loss. Tracking helps elderly users and their caregivers ensure sufficient daily nutrition.

Tracking a Surplus: What the Numbers Look Like

Weight gain requires a sustained calorie surplus. Here is what the math looks like for different goals.

Goal	Surplus needed	Weekly weight gain target	Monthly weight gain target
Lean muscle gain	200-300 kcal/day	0.1-0.2 kg (0.25-0.5 lb)	0.5-1 kg (1-2 lb)
Moderate bulk	300-500 kcal/day	0.2-0.35 kg (0.5-0.75 lb)	1-1.5 kg (2-3 lb)
Aggressive bulk	500-1000 kcal/day	0.35-0.7 kg (0.75-1.5 lb)	1.5-3 kg (3-6 lb)
Post-illness recovery	300-700 kcal/day	Variable	Variable
Underweight correction	300-500 kcal/day	0.2-0.35 kg (0.5-0.75 lb)	1-1.5 kg (2-3 lb)

The challenge is not knowing the target. It is hitting the target every single day. This is where tracking apps earn their value.

Best Free Weight Gain App by Specific Need

Best completely free option

FatSecret. It provides unrestricted calorie and macro tracking, weight trend graphs, weekly calorie averages, and a functional food database. There are no paywalled features that impact basic surplus tracking. You will need to mentally track your surplus consistency since FatSecret does not have dedicated weight gain features.

Best for serious bulking

Nutrola. Calorie floor alerts, surplus consistency scoring, high-calorie meal suggestions from a verified recipe library, and full macro tracking with per-meal breakdowns make it the most comprehensive weight gain tracking tool. At 2.50 euros per month, it costs less than a single protein bar.

Best for post-illness recovery

Nutrola. The calorie floor alerts are especially valuable for recovery patients who may have reduced appetite. Getting a notification that you are behind on calories by early afternoon provides a prompt to eat that might otherwise be missed.

Best for athletes who also need accurate protein tracking

Nutrola or Cronometer. Both have verified databases that ensure protein data is accurate. Nutrola adds per-meal protein distribution tracking, which is relevant for maximizing muscle protein synthesis during a bulk. Cronometer is free but has a smaller database.

Best for users who just want a simple surplus number

MyFitnessPal or Lose It. Both let you set a weight gain goal and display a simple calories remaining counter. If you do not need advanced features and just want to see whether you have eaten enough today, either works. MFP paywalls weight trend graphs; Lose It includes them free.

High-Calorie, High-Protein Foods for Efficient Bulking

For users tracking a surplus, calorie-dense foods make hitting targets easier. Here are the most efficient options per common serving.

Food	Serving	Calories	Protein	Calorie density
Peanut butter	2 tbsp (32g)	188 kcal	7g	588 kcal/100g
Whole milk	1 cup (244ml)	149 kcal	8g	61 kcal/100ml
Trail mix	1/4 cup (35g)	175 kcal	5g	500 kcal/100g
Salmon (Atlantic)	6 oz (170g)	350 kcal	34g	206 kcal/100g
Avocado	1 medium (150g)	240 kcal	3g	160 kcal/100g
Olive oil	1 tbsp (14ml)	119 kcal	0g	884 kcal/100ml
Oats (dry)	1 cup (81g)	307 kcal	11g	379 kcal/100g
Cheese (cheddar)	1 oz (28g)	113 kcal	7g	403 kcal/100g

All of these foods are in every app's database, but Nutrola's verified data ensures the calorie and protein numbers are accurate. Crowdsourced databases may show significantly different values for the same foods.

Tracking Weight Trends vs Daily Weight

Day-to-day weight fluctuations of 1 to 3 kilograms are normal and caused by water retention, food volume in the digestive tract, and glycogen stores. For weight gain tracking, weekly or bi-weekly averages are far more meaningful than daily weigh-ins.

Apps that show weight trend lines (FatSecret, Cronometer, Lose It, and Nutrola) help you see the actual trajectory through the noise. Apps that only show daily weight without a trend line (MFP free) can create confusion when a good bulking week shows a random dip on a single weigh-in day.

Nutrola's weight trend smoothing algorithm uses a 7-day moving average to show your true weight trajectory, filtering out daily fluctuations that might otherwise cause unnecessary concern.

Frequently Asked Questions

Which free calorie tracker is best for gaining weight?

FatSecret offers the most complete free experience for weight gain tracking, with unrestricted calorie and macro tracking, weight trend graphs, and weekly averages. Nutrola at 2.50 euros per month adds dedicated weight gain features like calorie floor alerts and surplus consistency scoring.

How many calories over maintenance should I eat to gain weight?

A surplus of 200 to 500 calories per day above your maintenance level supports weight gain of approximately 0.2 to 0.5 kilograms per week. Lean muscle gain requires the lower end of this range plus adequate protein (1.6 to 2.2 grams per kilogram body weight) and resistance training.

Can calorie tracking apps be set for weight gain instead of weight loss?

Yes. All major calorie tracking apps (MFP, Lose It, FatSecret, Cronometer, Yazio, Nutrola) allow you to set a weight gain goal. The app calculates a calorie target above your maintenance level. However, only Nutrola offers weight-gain-specific features like calorie floor alerts and high-calorie meal suggestions.

Why am I not gaining weight even though I eat a lot?

People who believe they eat a lot but do not gain weight are almost always overestimating their calorie intake. Studies show that self-reported "big eaters" who do not gain weight typically consume 400 to 1,000 fewer calories than they believe. Consistent calorie tracking for 2 weeks reveals the actual intake, which is usually lower than expected.

Is there an app specifically designed for weight gain?

No major app is designed exclusively for weight gain. All calorie trackers support both weight loss and weight gain goals. Nutrola comes closest to a weight-gain-optimized experience with features like calorie floor alerts, surplus consistency tracking, and high-calorie meal suggestions from its recipe library.