Height Calculator helps estimate adult height from parents’ height, age, and growth data. Quick, accurate, and easy tool for kids and teens.
Height Calculator
Our Height Calculator is a versatile tool designed to solve two common challenges: converting height between different measurement systems and predicting a child’s future adult height. Whether you’re tracking your child’s growth, converting measurements for international forms, or simply curious about height prediction, our calculator provides accurate results based on scientific methods. This comprehensive guide explains how height calculations work and how to get the most accurate results.
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Convert between measurement systems or predict future height with our easy-to-use calculator.
Height Conversion Calculator: Imperial vs. Metric Systems
Height measurements are commonly expressed in two main systems: the imperial system (feet and inches) used primarily in the United States, and the metric system (centimeters and meters) used throughout most of the world. Our Height Calculator bridges this gap by providing instant, accurate conversions between these systems.
Common Height Conversion Formulas
Imperial to Metric Conversion
- 1 inch = 2.54 centimeters
- 1 foot = 30.48 centimeters
- To convert feet to centimeters: multiply by 30.48
- To convert inches to centimeters: multiply by 2.54
Metric to Imperial Conversion
- 1 centimeter = 0.3937 inches
- 1 meter = 3.28084 feet
- To convert centimeters to inches: divide by 2.54
- To convert meters to feet: multiply by 3.28084
Step-by-Step Height Conversion Examples
| Conversion Type | Example | Formula | Result |
| Feet/inches to cm | 5’10” | (5 × 30.48) + (10 × 2.54) | 177.8 cm |
| Cm to feet/inches | 165 cm | 165 ÷ 30.48 = 5.41 feet (5’5″) | 5 feet, 5 inches |
| Meters to feet | 1.8 m | 1.8 × 3.28084 | 5.91 feet (5’11”) |
Using our Height Calculator eliminates the need for manual calculations and reduces the risk of conversion errors. Simply input your height in your preferred unit, and the calculator instantly provides the equivalent in other measurement systems.
Need to convert height measurements quickly and accurately?
Height Prediction Calculator: How Tall Will a Child Grow?
Predicting a child’s eventual adult height is a common concern for many parents. Our Height Calculator uses scientifically validated methods to provide reliable height predictions based on various factors including current height, weight, age, and parental heights.
Scientific Methods for Height Prediction
Khamis-Roche Method
The most accurate non-skeletal method for children over 4 years old. Uses current height, weight, and parental heights to predict adult stature with a margin of error of approximately 2.1 inches for boys and 1.7 inches for girls.
Mid-Parental Height Formula
A simple method based on parents’ heights. For boys: average parental height + 2.5 inches. For girls: average parental height – 2.5 inches. Has a margin of error of about 4 inches.
Bone Age Assessment
The most accurate method (requires medical imaging). Uses X-ray of hand and wrist to determine skeletal maturity, which is then used to predict remaining growth potential.
Factors Affecting Height Development
Genetic Factors (60-80%)
- Parental heights
- Family history of height patterns
- Genetic conditions (e.g., Marfan’s syndrome)
- Ethnic background
Environmental Factors (20-40%)
- Nutrition and diet quality
- Health conditions
- Hormone levels (growth hormone, thyroid)
- Physical activity and exercise
- Sleep quality and duration
Our Height Calculator incorporates these factors to provide the most accurate prediction possible without requiring medical imaging. For children under 4 years old, predictions are based primarily on parental heights, while for older children, more comprehensive calculations can be performed.
Predict Your Child’s Adult Height
Get a scientifically-based estimate of how tall your child will grow.
Tips for Accurate Height Measurement
Accurate height measurement is essential for both conversion and prediction calculations. Follow these guidelines to ensure you get the most precise measurements:
For Adults and Children
- Remove shoes and heavy clothing
- Stand on a flat, uncarpeted surface
- Stand with back, shoulders, and heels against a wall
- Look straight ahead with head level (not tilted up or down)
- Place a flat object (book or clipboard) on top of the head at a right angle to the wall
- Mark the wall at the bottom edge of the object
- Measure from the floor to the mark
For Infants and Toddlers
- Use a flat surface like a changing table
- Have one person gently hold the child’s head
- Straighten the child’s legs
- Measure from the top of the head to the bottom of the heel
- Take multiple measurements and average them
- Measure at the same time of day for consistency
- Record date with measurement for tracking growth
Did you know? Height can vary by up to 2 cm (0.8 inches) throughout the day. People are typically tallest in the morning after lying flat all night and shortest in the evening after the spine has compressed from daily activities.
Recommended Measurement Tools
- Stadiometer: A professional height measuring device used in medical settings
- Wall-mounted height chart: Convenient for tracking growth over time
- Measuring tape: Flexible but requires proper technique for accuracy
- Digital height measuring devices: Provide quick and accurate readings
Using proper measuring techniques and tools ensures that the data you input into our Height Calculator will yield the most accurate results possible.
Practical Applications of Height Calculations
Height calculations serve numerous practical purposes in everyday life. Our Height Calculator can help with all of these applications and more:
Medical & Growth Tracking
- Monitoring child development against growth charts
- Identifying potential growth issues early
- Calculating Body Mass Index (BMI)
- Determining appropriate medication dosages
International Travel & Documentation
- Converting height for passport applications
- Completing visa forms with correct measurements
- Understanding height requirements for activities
- Converting clothing sizes between countries
Ergonomics & Design
- Adjusting furniture to proper heights
- Setting up workstations ergonomically
- Selecting appropriate sports equipment
- Planning home modifications for accessibility
Our Height Calculator simplifies these applications by providing instant, accurate conversions and predictions. Whether you’re filling out international forms, tracking your child’s growth, or setting up an ergonomic workspace, having reliable height calculations at your fingertips makes these tasks easier and more precise.
Simplify Your Height Calculations
Get instant, accurate height conversions and predictions for any purpose.
Frequently Asked Questions About Height Calculation
How accurate is the height prediction for children?
The accuracy depends on the method used. The Khamis-Roche method (used in our calculator for children over 4) has a margin of error of approximately 2.1 inches for boys and 1.7 inches for girls. For younger children, predictions based on parental height have a wider margin of error of about 4 inches. Many factors can influence final adult height, including nutrition, health conditions, and timing of puberty.
When do boys and girls stop growing in height?
On average, girls complete their growth around age 14-15, typically about 2 years after their first menstrual period. Boys usually continue growing until around age 16-17, though some may grow until age 18-19. Growth plates in long bones close after puberty, making further height increases impossible without medical intervention.
Can nutrition or exercise increase a child’s potential height?
Proper nutrition and regular exercise can help a child reach their genetically determined height potential, but cannot increase that potential beyond genetic limits. Severe malnutrition or certain health conditions can prevent a child from reaching their full height potential. A balanced diet rich in protein, calcium, and vitamins D and A supports optimal growth.
Why might my height measurement vary at different times?
Height can vary by up to 2 cm (0.8 inches) throughout the day due to spinal compression. People are typically tallest in the morning after lying flat all night and shortest in the evening. For the most consistent measurements, try to measure height at the same time of day, preferably in the morning.
How do I convert 5’10” to centimeters?
To convert 5’10” to centimeters: First, convert 5 feet to inches (5 × 12 = 60 inches). Add the additional 10 inches (60 + 10 = 70 total inches). Multiply by 2.54 to convert to centimeters (70 × 2.54 = 177.8 cm). Our Height Calculator performs this conversion automatically.
What is the average height for adults?
Average heights vary by country and ethnicity. In the United States, the average height for adult men is approximately 5’9″ (175 cm) and for adult women is about 5’4″ (163 cm). These averages have increased over time due to improved nutrition and healthcare, a phenomenon known as the secular trend in height.
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Get Accurate Height Calculations Now
Our Height Calculator provides instant, accurate conversions between different measurement systems and reliable predictions of children’s adult height based on scientific methods. Whether you’re tracking growth, filling out forms, or simply curious about height predictions, our calculator offers the precision and ease of use you need.
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Our calculator is regularly updated with the latest scientific methods and conversion formulas to ensure the highest possible accuracy. For medical concerns about growth or height, always consult with a healthcare professional.