Calculate your child's height and weight percentile using WHO growth standards.
Children grow at wildly different rates, and knowing whether your child is tracking within a normal range requires more context than just their current height and weight. This calculator plots your child's measurements against the World Health Organization growth standards to give you a percentile — a way to see where they sit relative to other children of the same age and sex.
A percentile of 50 means your child is exactly at the median — half of children that age are taller/heavier, half are shorter/lighter. Being at the 10th or 90th percentile isn't a problem in itself — what matters more is whether the percentile has been consistent over time, not whether it's at a particular number.
If your child has dropped significantly across percentile lines, or if you have any concerns about their growth, speak to your GP or child health nurse. Growth charts are a screening tool, not a diagnosis.
A percentile shows where your child ranks compared to a reference population of the same age and sex. A child at the 75th percentile for height is taller than 75% of children their age. Anywhere from the 3rd to 97th percentile is considered within the normal range.
Not necessarily. Children naturally vary in size, and much of a child's growth trajectory is genetic. What's more important is consistency — a child who has always been at the 15th percentile and stays there is growing normally. A child who drops from the 60th to the 20th percentile over a year warrants attention.
Your child health nurse will measure and plot growth at scheduled check-ups in the early years. Between appointments, measuring at home every 3-6 months is enough. Daily or weekly measurements aren't meaningful because growth happens in spurts.
The WHO growth standards (released 2006) were developed from a longitudinal study of children in six countries raised under optimal conditions — breastfed, non-smoking households, good nutrition. They describe how children should grow, not just how they typically grow.