Abstract In hospitalized children, height should be measured. When world health organization (WHO) height measurement gold standards is impossible, the ideal height estimation technique is still unclear. We conducted an international prospective study in eight different pediatric intensive care units to assess the accuracy, precision, practicability, safety, and inter-rater reliability of 12 different height estimation techniques, based on body segment measurement extrapolation, or other calculations using previous or projected heights. All extrapolation techniques were performed on each child, and later compared to their WHO gold standard heights. A total of 476 patients were enrolled. In the < 2-year subgroup, board length use and growth chart extrapolation performed best. In the ≥ 2-year subgroup, growth chart extrapolation and parents’ report were the most accurate, followed by height measurement alongside the body with a tape measure. In both groups, body segment extrapolations were poorly predictive and showed mean bias and limits of agreement that varied a lot with age. Most body segment-based techniques presented with frequent measurement difficulties, but children’s safety was rarely compromised. The inter-rater reliability of body segment measurement was low in the < 2-year subgroup. Conclusions : To accurately estimate height in hospitalized children, health care professionals should integrate the accuracy, precision, practicability, and reliability of each measurement technique to select the most appropriate one. Body segment-based techniques were the least accurate and should probably not be used. Simple techniques like growth chart extrapolation, or measurement alongside the body (and length board measurement in the youngest) should be implemented in daily practice. Trial Registration : The study protocol was registered (12 th April 2019) on the clinical-trial.gov website (NCT03913247). What is Known: • Height should be measured in hospitalized children to assess nutritional status and calculate various clinical parameters . • Many hospitalized children cannot be measured using WHO conventional height measurement methods. The ideal height estimation method has not been identified yet . What is New: • Most estimation methods based on body segment measurement extrapolation fail to accurately predict height .• Board length use and growth chart extrapolation performed best in young children (≥2 years). Growth chart extrapolation and parents’ report were the most accurate, followed by height measurement alongside the body with a tape measure in older children .