course handicap calculation | Golf Monthly

One decimal place (phrased as "rounded to the nearest tenth" in the rules) applies to the Handicap Index and Score Differential (and Course Rating), but not Course Handicap.

For Course Handicaps, the rules and CONGU's guidance refer only to "rounded to the nearest whole number", "rounded integer" and "full calculated" (unrounded) values.

For clarity, in Scotland, 3 decimal places are used wherever "full calculated" applies (i.e. Playing Handicap calculations) since any further accuracy is unnecessary. The rest of GB&I use the rounded integer value.

The apps are doing the calculation correctly by simply using the full calculated value to produce the rounded integer value.