|Olympic medal record|
|Competitor for Finland|
|Men’s speed skating|
|Bronze||1936 Garmisch-Partenkirchen||1,500 m|
|Silver||1936 Garmisch-Partenkirchen||5,000 m|
|Silver||1936 Garmisch-Partenkirchen||10,000 m|
Wasenius reached the world top in 1933 when he won a silver medal at the European Allround Championships. More medals soon followed, including two silver medals and one bronze medal at the 1936 Winter Olympics of Garmisch-Partenkirchen, but none of them were gold. Most of the gold medals those days went to Norwegian skater Ivar Ballangrud. In fact, four of the six silver medals Wasenius won at the Winter Olympics, the World Allround Championships, and the European Allround Championships were behind Ballangrud. Finally, at the 1939 World Allround Championships of Helsinki, his city of birth, Wasenius became World Allround Champion, winning the 1,500 m and finishing second on the other three distances.
An overview of medals won by Wasenius at important championships he participated in, listing the years in which he won each:
|Championships||Gold medal||Silver medal||Bronze medal|
|Winter Olympics||–||1936 (5,000 m)
1936 (10,000 m)
|1936 (1,500 m)|
In addition, Wasenius won the Finnish National Allround Championships in 1933, 1934, 1935, 1937, 1938, and 1939 – a total of six times.
Personal records 
To put these personal records in perspective, the WR column lists the official world records on the dates that Wasenius skated his personal records.
|500 m||43.4||5 February 1938||Davos||42.3|
|1,500 m||2:18.2||31 January 1937||Davos||2:17.4|
|3,000 m||4:55.7||30 January 1937||Davos||4:49.6|
|5,000 m||8:21.3||31 January 1937||Davos||8:17.2|
|10,000 m||17:28.2||14 February 1936||Garmisch-Partenkirchen||17:17.4|
Wasenius has an Adelskalender score of 192.006 points. His highest ranking on the Adelskalender was a third place.
- Birger Wasenius at SkateResults.com
- Evert Stenlund's Adelskalender pages
- Historical World Records from the International Skating Union
- The Winter War 1939-1940 from Puolustusvoimat (the Finnish Defence Forces)