It is the first time Cardiff have claimed a place in the play-offs since winning promotion to the Championship in 2003.
They head into the end-of-season lottery on their best run of the season and are unbeaten in nine, winning six of them.
Off the pitch though, the Bluebirds have endured a torrid season.
They are due at the High Court on 5 May, three days after the end of the regular season, where they face a winding up order over an unpaid tax bill of £1.9m owed to Her Majesty's Revenue & Customs.
The club's financial problems could have threatened to derail their play-off push as manager Dave Jones has not been able to bring in any new players, and at one point, his squad was down to the bare bones due to injuries.
But Cardiff have battled through and now join Nottingham Forest who secured their play-off place a week a go.
Ledley wants Cardiff play-off glory
Leicester will join them this weekend if they beat Preston at Deepdale, while Swansea will also seal their place with a win at Sheffield United and Blackpool fail to beat Peterborough.
"It's a really good feeling... with our form going into the play-offs we're really looking forward to it," added Bothroyd, who has scored 11 goals for the Bluebirds this season.
"There are three good teams trying to get in the play-offs, but we're happy we're in there and whoever we play, I'm sure they won't want to play us.
"The last few games have been really tight - maybe not the best performances, but we've got the points and that's the main thing.
"It's about getting the points on the board and getting in the play-offs and we're happy to be there.
"But we're not taking our foot off the pedal. We still want to push on and see where we can finish."
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