Power Calculators

🔮 Child Height Predictor: How Tall Will My Child Be?

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📏 How to measure height at homeTap to see the illustrated guide
Illustration: how to measure height at home — Stand barefoot on a hard floor with heels, bottom and shoulders against a wall, looking straight ahead. Rest a hardback book or ruler flat on top of the head, touching the wall, and mark underneath it.
  1. Stand barefoot on a hard floor with heels, bottom and shoulders against a wall, looking straight ahead.
  2. Rest a hardback book or ruler flat on top of the head, touching the wall, and mark underneath it.
  3. Measure from the floor to the mark with a steel tape. Children from age 2 are measured standing like this.
Barefoot, standing against a wall.

Fill in the details and click Calculate to see your results.

Formula at a glance

Height Predictor formula: Adult height = (father + mother + 13 cm) ÷ 2; Adult height = (father + mother − 13 cm) ÷ 2
How the height predictor works: Adult height = (father + mother + 13 cm) ÷ 2

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📘 About the Height Predictor

How tall will my child be? Doctors use the mid-parental height: the average of the parents' heights, plus 6.5 cm for a boy or minus 6.5 cm for a girl. About 95% of children end up within ±8.5 cm of it.

Add your child's current height and date of birth (from age 2) and the calculator also projects their current height percentile to adulthood, then averages both predictions.

🧮 Formula

Boys
Adult height = (father + mother + 13 cm) ÷ 2
Girls
Adult height = (father + mother − 13 cm) ÷ 2

Where

  • Use 5 inches instead of 13 cm when working in inches

✏️ Worked examples

Boy: father 175 cm, mother 160 cm

You enter
SexBoy
Father's Height175
Mother's Height160
Length Unitcm
You get
Predicted adult height (mid-parental method)174 cm (5 ft 9 in)
Likely range (95% of children)166 – 183 cm (5 ft 5 in – 6 ft 0 in)
Average adult height (reference)India ≈ 166 cm (5 ft 5 in); US ≈ 176 cm (5 ft 9 in); UK ≈ 176 cm

174 cm (5 ft 9 in).

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Girl: father 5 ft 10 in (70 in), mother 5 ft 4 in (64 in)

You enter
SexGirl
Father's Height70
Mother's Height64
Length Unitinches
You get
Predicted adult height (mid-parental method)163.7 cm (5 ft 4 in)
Likely range (95% of children)155 – 172 cm (5 ft 1 in – 5 ft 8 in)
Average adult height (reference)India ≈ 153 cm (5 ft 0 in); US ≈ 163 cm (5 ft 4 in); UK ≈ 163 cm

163.7 cm (5 ft 4 in).

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Boy aged 6, 120 cm, father 178, mother 162

You enter
SexBoy
Father's Height178
Mother's Height162
Length Unitcm
Date of Birth (optional)15 Jan 2020
Child's Current Height (optional)120
Growth chart / countryWHO — India, UK, Australia & most countries
You get
Predicted adult height (mid-parental method)176.5 cm (5 ft 9 in)
Likely range (95% of children)168 – 185 cm (5 ft 6 in – 6 ft 1 in)
Prediction from current height percentile175.6 cm (5 ft 9 in) — stays on the 47th percentile
Average of both methods176 cm (5 ft 9 in)
Average adult height (reference)India ≈ 166 cm (5 ft 5 in); US ≈ 176 cm (5 ft 9 in); UK ≈ 176 cm

176.5 cm (5 ft 9 in); 175.6 cm (5 ft 9 in) — stays on the 47th percentile.

Try this example →

❓ Frequently asked questions

How accurate is a height predictor?

Within about ±8.5 cm for 95% of children. Puberty timing, nutrition and health can move the result.

Is it true you can double a 2-year-old's height?

Roughly: boys reach about double their height at 2 years and girls about double their height at 18 months, though it is only a rough rule.

Can my child grow taller than both parents?

Yes, many do, especially with better nutrition than the parents had as children.