| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2009/2010 | League Two (England) | 39 | — | 8 | 0 | — | — |
| 2010/2011 | League Two (England) | 33 | 2180 | 5 | 0 | 0.21 | — |
| 2011/2012 | Premiership | 22 | 1472 | 3 | 0 | 0.18 | — |
| 2012/2013 | Premiership | 38 | 2859 | 23 | 0 | 0.72 | — |
| 2013/2014 | Premiership | 38 | 3328 | 18 | 0 | 0.49 | — |
| 2014/2015 | Championship (England) | 9 | 258 | 0 | 0 | 0 | — |
| 2014/2015 | Premiership | 23 | 1929 | 10 | 0 | 0.47 | — |
| 2015/2016 | League One (England) | 1 | 12 | 0 | 0 | — | — |
| 2015/2016 | Premiership | 29 | 2359 | 12 | 3 | 0.57 | — |
| 2016/2017 | League One (England) | 26 | 1694 | 0 | 0 | 0 | — |
| 2016/2017 | Premiership | 15 | 1261 | 4 | 0 | 0.29 | — |
| 2017/2018 | Premiership | 22 | 1134 | 3 | 0 | 0.24 | — |
| 2017/2018 | League One (Scotland) | 5 | 209 | 0 | 0 | 0 | — |
| 2018/2019 | Championship (Scotland) | 24 | 1831 | 17 | 3 | 0.98 | — |
| 2019/2020 | Premiership | 27 | 1927 | 7 | 5 | 0.56 | 6.99 |
| 2020/2021 | Premiership | 28 | 1292 | 5 | 1 | 0.42 | 6.98 |
| 2021/2022 | Championship (Scotland) | 32 | 2302 | 9 | 3 | 0.47 | — |
| 2022/2023 | Championship (Scotland) | 34 | 2746 | 14 | 6 | 0.66 | — |
| 2023/2024 | Championship (Scotland) | 36 | 2673 | 8 | 2 | 0.34 | — |
| 2024/2025 | League One (Scotland) | 36 | 2959 | 6 | 4 | 0.3 | — |
| 2025/2026 | League One (Scotland) | 25 | 1123 | 6 | 1 | 0.56 | — |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Cohort: 38 League One (Scotland) forwards, 2025/2026, min. 450 minutes. Computed by ranking the full league corpus, not taken from any feed.
Figures computed from the GioScore season-stats database · as of 2026-09-02
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Hibernian | 19 | 7 | 6 | 6 | 6 | 0 | 0 | 0 |
 St. Mirren | 18 | 7 | 6 | 5 | 4 | 0 | 0 | 0 |
 Hearts | 16 | 4 | 9 | 3 | 6 | 0 | 0 | 0 |
 Ross County | 14 | 7 | 3 | 4 | 6 | 0 | 1 | 0 |
 Dunfermline Athletic | 13 | 4 | 8 | 1 | 3 | 0 | 0 | 0 |
 Rangers | 11 | 1 | 0 | 10 | 1 | 0 | 0 | 0 |
 Inverness CT | 8 | 2 | 4 | 2 | 4 | 0 | 1 | 0 |
 Queen's Park | 8 | 2 | 2 | 4 | 3 | 0 | 0 | 0 |
 Dumbarton | 6 | 3 | 1 | 2 | 3 | 0 | 0 | 0 |
 Annan Athletic | 5 | 2 | 0 | 3 | 1 | 0 | 1 | 0 |
 Hamilton Academical | 5 | 3 | 1 | 1 | 1 | 1 | 0 | 0 |
 Queen of the South | 5 | 0 | 3 | 2 | 1 | 1 | 2 | 0 |
 Shrewsbury Town | 4 | 0 | 0 | 4 | 0 | 0 | 0 | 0 |
 Gillingham | 4 | 3 | 0 | 1 | 0 | 0 | 0 | 0 |
 Port Vale | 4 | 0 | 4 | 0 | 0 | 0 | 0 | 0 |
 Greenock Morton | 4 | 0 | 1 | 3 | 0 | 0 | 1 | 0 |
 Airdrieonians | 4 | 1 | 1 | 2 | 0 | 0 | 1 | 0 |
 Southend United | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Bury | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Bradford City | 3 | 1 | 1 | 1 | 1 | 0 | 1 | 0 |
Billy McKay's 2025/2026 League One (Scotland) season produced 6 goals and 1 assist across 25 appearances (1,123 minutes) — 0.56 goal involvements per 90. Within 38 League One (Scotland) forwards with at least 450 minutes in 2025/2026, he places in the 89th percentile by goal involvements per 90, above the median, while ranking 9th of 38 for goals.
At his best he averaged 6.99 in 2019/2020, Premiership; at his worst, 6.98 in 2020/2021.
