| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2009 | Eliteserien | 28 | 2520 | 1 | 0 | 0.04 | — |
| 2010 | Eliteserien | 25 | 2058 | 6 | 0 | 0.26 | — |
| 2011/2012 | Pro League | 16 | 388 | 0 | 0 | 0 | — |
| 2011 | Eliteserien | 25 | 1810 | 1 | 0 | 0.05 | — |
| 2012/2013 | Serie A | 24 | — | 2 | 0 | — | — |
| 2013/2014 | Serie A | 14 | — | 0 | 1 | — | — |
| 2014/2015 | Serie B | 38 | — | 12 | 0 | — | — |
| 2015/2016 | Super League (Switzerland) | 28 | 1892 | 10 | 0 | 0.48 | — |
| 2016/2017 | Championship (England) | 8 | 423 | 0 | 0 | 0 | — |
| 2016/2017 | Super League (Switzerland) | 13 | 827 | 4 | 0 | 0.44 | — |
| 2017/2018 | Championship (England) | 40 | 1050 | 3 | 2 | 0.43 | 7.17 |
| 2018/2019 | Championship (England) | 33 | 929 | 2 | 0 | 0.19 | 6.78 |
| 2019/2020 | Serie A | 13 | 803 | 0 | 1 | 0.11 | 6.5 |
| 2020/2021 | Serie B | 27 | 1597 | 6 | 3 | 0.51 | 6.99 |
| 2021/2022 | Super Lig | 34 | 1847 | 5 | 1 | 0.29 | 6.87 |
| 2022/2023 | Super Lig | 19 | 157 | 0 | 1 | 0.57 | 6.97 |
| 2023 | Eliteserien | 11 | 300 | 2 | 0 | 0.6 | 6.77 |
| 2023/2024 | Serie B | 39 | 1948 | 4 | 0 | 0.18 | 6.76 |
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.
Figures computed from the GioScore season-stats database · as of 2026-08-06
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Fiorentina | 7 | 2 | 3 | 2 | 1 | 0 | 0 | 0 |
 Sampdoria | 7 | 2 | 3 | 2 | 2 | 0 | 0 | 0 |
 Cittadella | 7 | 2 | 1 | 4 | 1 | 0 | 1 | 0 |
 Bologna | 7 | 0 | 4 | 3 | 0 | 0 | 1 | 0 |
 Middlesbrough | 6 | 3 | 2 | 1 | 0 | 0 | 0 | 0 |
 Roma | 6 | 0 | 1 | 5 | 0 | 0 | 0 | 0 |
 Parma | 6 | 1 | 1 | 4 | 0 | 0 | 0 | 0 |
 Cagliari | 6 | 2 | 2 | 2 | 0 | 0 | 0 | 0 |
 Pisa | 6 | 2 | 1 | 3 | 1 | 1 | 0 | 0 |
 Palermo | 6 | 3 | 1 | 2 | 1 | 0 | 0 | 0 |
 Sassuolo | 6 | 1 | 0 | 5 | 1 | 0 | 0 | 0 |
 Reggiana | 6 | 2 | 3 | 1 | 0 | 0 | 1 | 0 |
 Catania | 6 | 3 | 0 | 3 | 0 | 0 | 0 | 0 |
 Cremonese | 6 | 1 | 2 | 3 | 0 | 0 | 0 | 0 |
 ChievoVerona | 5 | 3 | 0 | 2 | 0 | 0 | 1 | 0 |
 AC Milan | 5 | 0 | 0 | 5 | 0 | 0 | 0 | 0 |
 Bristol City | 5 | 3 | 2 | 0 | 2 | 0 | 0 | 0 |
 Brentford | 5 | 0 | 2 | 3 | 0 | 0 | 0 | 0 |
 Venezia | 5 | 2 | 2 | 1 | 0 | 0 | 0 | 0 |
 Molde | 5 | 1 | 3 | 1 | 1 | 0 | 0 | 0 |
Player stats against each opponent national team
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Latvia | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
 Mexico | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 0 |
 Norway | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Denmark | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Austria | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 France | 2 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
 Poland | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Switzerland | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Belgium | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Qatar | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Ghana | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
 Greece | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
 Finland | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 |
 Croatia | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Kazakhstan | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Cyprus | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
 Slovenia | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Romania | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Armenia | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Albania | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
All of Birkir Bjarnason's 2023/2024 Serie B output came as goals: 4 goals in 39 games (1,948 minutes) — 0.18 goal involvements per 90. That season graded out at an average match rating of 6.76.
No season rated higher than 2017/2018 (7.17, Championship (England)); none lower than 2019/2020 (6.5).
