Based on tables from WHO: http://www.who.int/childgrowth/standards/height_for_age/en/
Examples
pct_height_for_age(age = 5, sex = "female")
#> $P01
#> [1] 94.709
#>
#> $P1
#> [1] 98.341
#>
#> $P3
#> [1] 100.459
#>
#> $P5
#> [1] 101.581
#>
#> $P10
#> [1] 103.308
#>
#> $P15
#> [1] 104.474
#>
#> $P25
#> [1] 106.195
#>
#> $P50
#> [1] 109.402
#>
#> $P75
#> [1] 112.609
#>
#> $P85
#> [1] 114.329
#>
#> $P90
#> [1] 115.495
#>
#> $P95
#> [1] 117.222
#>
#> $P97
#> [1] 118.344
#>
#> $P99
#> [1] 120.462
#>
#> $P999
#> [1] 124.094
#>
pct_height_for_age(age = 5, height = 112, sex = "female")
#> $percentile
#> [1] 70.3
#>