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Free BMI Calculators – Calculate Your Body Mass Index Online
Use our Free BMI Calculators to check your Body Mass Index in a simple way. Add your height and weight. Then see your BMI score, weight range, and next step.
At Affordable Meal Plans, we make health tools easy to use. BMI can help you understand your weight range. It can show if your weight may be low, healthy, high, or very high for your height.
BMI is not a full health test. It does not check muscle, bone, body fat, or health history. So, use our tool as a guide.
BMI Calculator
For adults aged 18 and above
Types of Free BMI Calculators We Offer
We offer different BMI tools because each person may need a different check.
Calculator Type | Also Known As | Best For |
Free Reverse BMI Calculator | Backwards BMI calculator, reverse BMI calculator for height | Finding a target weight from height and goal BMI |
Free BMI Calculator for Kids | Pediatric BMI calculator, BMI calculator for children | Children and teens aged 2 to 19 |
Free BMI Calculator for Adults | Free Body Mass Index Calculator for adults, BMI amputee calculator | Adults aged 20 and over, plus adjusted BMI estimates for limb loss |
Free BMI Calculator for Adults
It is for people aged 20 and over. Use our tool to check your BMI using your height and weight.
BMI means Body Mass Index. It compares body weight with height.
You do not need to do the math. Our tool does it for you.
Adult BMI Formula
BMI = weight ÷ height²
Adult BMI Result Table
BMI Score | Weight Group | Simple Meaning |
Below 18.5 | Underweight | Your weight may be low for your height |
18.5 to 24.9 | Healthy weight | Your weight is in the common healthy range |
25.0 to 29.9 | Overweight | Your weight may be higher than ideal |
30.0 or more | Obesity range | Your BMI is in a higher risk range |
Adult BMI Graph
Use BMI as a first check. Also look at waist size, food habits, sleep, blood pressure, and activity level.
Free Reverse BMI Calculator
It helps you find a possible target weight from your height and goal BMI.
A normal BMI tool asks:
What is my BMI?
A reverse BMI tool asks:
What weight matches my target BMI
Reverse BMI Example
Height | Target BMI | Estimated Weight |
5 ft 4 in | 22 | About 128 lb |
5 ft 7 in | 22 | About 140 lb |
5 ft 10 in | 22 | About 153 lb |
6 ft 0 in | 22 | About 162 lb |
Healthy BMI Goal Bar
This tool can help with weight goals. But do not use it for crash dieting. A safe plan should be slow, steady, and easy to keep.
At Affordable Meal Plans, we believe a good plan should fit real life. It should not feel extreme.
Free BMI Calculator for Kids
The Free BMI Calculator for Kids is for children and teens aged 2 to 19.
Kids do not use the same BMI chart as adults. Children grow fast. Their body size changes with age. Boys and girls also grow in different ways.
That is why a child’s BMI is checked by age, sex, height, and weight. With our tool, the results you will get will be shown as a BMI percentile.
A BMI percentile compares a child with other children of the same age and sex.
Kids BMI Tool Inputs
Input | Why We Ask |
Age | Kids grow fast, so age matters |
Sex | Boys and girls grow in different ways |
Height | Needed to calculate BMI |
Weight | Needed to calculate BMI |
BMI percentile | Shows the child’s weight range |
Kids BMI Result Table
BMI Percentile | Result |
Less than 5th percentile | Underweight |
5th to less than 85th percentile | Healthy weight |
85th to less than 95th percentile | Overweight |
95th percentile or higher | Obesity range |
Kids BMI Graph
Our tool is only a guide. Talk to a doctor, dietitian, or child health nurse if the outcome worries you.
For children, the aim is appropriate development. The objective is not speedy weight loss.
Good steps for kids are:
- More fruit and vegetables
- Less sugary drinks
- Better sleep
- More active play
- Regular meals
- Smaller snack portions
- Less screen time when possible
BMI Amputee Calculator
A normal calculator may not work well for people with limb loss. This is because body weight changes after amputation.
The BMI amputee calculator gives an adjusted BMI estimate. It uses height, current weight, and amputation type.
Amputee BMI Inputs
Input | Example |
Current weight | 160 lb |
Height | 5 ft 9 in |
Amputation type | Below-knee, above-knee, arm, hand |
Missing limb estimate | Based on selected limb |
Result | Estimated BMI |
This outcome is merely an approximation. Speak to a doctor, dietitian, or prosthetic care professional for a complete review.
What Your BMI Result Signifies
Your BMI score is a beginning point. It can guide your choice of the following course of action.
BMI Action Table
Result | Simple Next Step |
Underweight | Check food intake, stress, appetite, and health |
Healthy weight | Keep steady meals, sleep, and movement |
Overweight | Review snacks, drinks, portions, and activity |
Obesity range | Ask a health expert for a safe plan |
High child BMI | Speak with a child health expert |
Do not panic over one number. BMI is only one part of health.
Other useful checks include:
- Waist size
- Blood pressure
- Blood sugar
- Cholesterol
- Sleep
- Energy level
- Daily food habits
- Daily movement
Use BMI With a Great Meal Plan
BMI gives you a number. Food habits help change the trend.
A simple plate plan can help.
Easy Plate Guide
Food Group | Plate Share |
Vegetables or fruit | 50% |
Protein | 25% |
Whole grains or starch | 25% |
Plate Graph
Meal Tips
- Fill half your plate with fruit or vegetables.
- Add protein at each meal.
- Drink water more often.
- Eat slowly.
- Use smaller plates if portions are too large.
- Limit sugary drinks.
- Walk more when you can.
- Track your weight once a week.
Our goal at Affordable Meal Plans is to help you make small changes that feel possible.
Written by: Affordable Meal Plans Editorial Team
Reviewed by: Not Reviewed Yet
Last Updated: 1st July 2026
Medical Note: This tool is for general education only. It does not diagnose, treat, or replace medical advice.
Calculate Your BMI Now
Use our Free BMI Calculators to check your adult BMI, child BMI, reverse BMI, or amputee BMI estimate. Your result can help you understand your weight range. Don’t wait! Try our tool now!
FAQs
How is BMI calculated?
The math uses a simple ratio. Our tool does the hard work for you. If you want to see the exact math we use, here are the rules:
- Metric: Weight in kilos divided by height in meters squared.
- Imperial: Weight in pounds divided by height in inches squared, times 703.
How often should I check my BMI?
BMI does not need daily checking. Your score changes slowly because it depends on height and weight.
Goal | How Often to Check |
General health | Every 3 months |
Weight loss | Once a month |
Weight gain | Once a month |
Child growth | Ask a doctor |
A steady pattern is more useful than one daily result. Our advice is to track calmly, not too often.
Can BMI tell me if I am healthy?
BMI can show a weight range, but it cannot show your full health.
It does not check:
- Muscle
- Body fat
- Bone size
- Blood pressure
- Blood sugar
- Fitness level
- Health history
What should I do after I get my BMI result?
After you get your BMI result, choose one simple next step. Our tool gives a number, but your daily habits help shape progress.
BMI Result | What You Can Do |
Low BMI | Add balanced meals and ask for help if needed |
Healthy BMI | Keep steady meals and movement |
High BMI | Check portions, drinks, snacks, and activity |
Very high BMI | Speak with a doctor or dietitian |
Helpful steps:
- Drink more water
- Eat more fruit and vegetables
- Add protein to meals
- Walk more often
- Sleep on time
- Reduce sugary drinks
Can I use BMI during pregnancy?
BMI during pregnancy is different. This is because weight changes as the baby grows.
During pregnancy, ask a doctor about:
- Safe weight gain
- Food needs
- Vitamins
- Blood sugar
- Blood pressure
- Baby growth
Our meal ideas can support healthy eating, but pregnancy care should be personal.
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