[2] He represented his country at the 2019 World Championships in Doha without qualifying for the final.

He qualified for the finals at the Europeans (Münich) in 2022 and got a 4th place with a height of 5.75m.

His personal bests in the event are 5.81m (outdoors, 2022) and 5.82m (indoors, 2023).

Koppelaar served a two year competition ban ending in July 2016 in relation to an anti-doping rule violation after testing positive for excessive testosterone at an event in Germany in May 2014.

This biographical article relating to Dutch athletics is a stub.