eNPS calculator

How this tool works

Employee Net Promoter Score is the same arithmetic as NPS, asked about a workplace: the share of promoters (9 or 10) minus the share of detractors (0 to 6), in points from −100 to +100, with passives (7 and 8) counted in the total and nowhere else.

A team is not a market. It is small, and you know how many people are in it, so the interval here applies the finite population correction √((N − n) ÷ (N − 1)) to the usual standard error √((p + d − (p − d)²) ÷ n), where N is the number of people invited and n the number who answered. The more of the team answers, the narrower the interval; when everyone has, it disappears, because the score is the team's own rather than an estimate of it. With 14 promoters, 16 passives and 10 detractors from a team of 52, the score is +10 and the 95% interval runs from about −2 to +22.

The change from last round gets its own interval, from both rounds' uncertainty together. It treats the two rounds as separate samples, which is cautious when mostly the same people answer both: a change it calls clear is clear. A small team's score moves a long way when one or two people change their minds, so read the change before the score.

The interval covers chance, not who chose to answer. If half the team stayed silent, the half that answered may not speak for them. And under five answers, a score can point to who gave it: hold it back, as Plumeform's minimum group size does on its own.