Owen McCallum gave the O's the lead before a disastrous three minutes saw Aaron Hopkins and Stuart Windsor score twice for Calne. Sam Hippisley then equalised before McCallum grabbed a sensational winner with eleven minutes left on the clock.
The result sees Oldland climb another place to 15th in the Division One table after the best week of the season sees the O's take nine points from nine.
After the impressive victory over Corsham in midweek. unavailability meant there were four changes to that starting eleven. Ollie Fowler in goal was replaced by Josh Dempsey, returning from suspension, and with Jordan Richards, Jason Side and John Scorrer all missing, there were recalls for David Stone and Connor Davies from the bench and Gary Shorney.
Early doors, it was the visitors that settled the quicker although their sights were a little off target. Ryan Dunn's long range effort and Stone's shot both went wide while Hippisley's header dropped over the crossbar. Aaron Witchell was the pick of the Calne forwards, shooting straight at Dempsey then sidefooting well wide from the edge of the box.
The Oldland forwards were combining well and after Danny Carter was put through by Davies, he couldn't chip the ball over Steve Allison in the Calne goal. But Allison was left helpless on 23 minutes when the visitors took the lead. Great work by Wayne Pearce down the left channel saw the tireless forward set up McCallum and the teenager collected himself before finishing neatly at the near post.
Ashley Bernard almost grabbed a superb second two minutes later but his volley from a corner smashed against the inside of the post and somehow squirted to safety. The luck having turned Calne's way was then compounded when the home side scored twice within three minutes to take an unlikely lead. First, Hopkins finished into the corner on 28 minutes and then Windsor saw his looping header go over Dempsey and into the far corner.
It was harsh on Oldland who had been the better side and the half closed with little reply, in truth only one chance from Carter that didn't really trouble Allison. His team mate Tom Boakes went close early in the second half with a shot after latching on to a long throw in and Witchell's shot was blocked before it could do damage.
Then out of nowhere, Oldland equalised on the halfway mark of the second period. A Lewis Parker corner wasn't cleared properly and after Pearce & Bernard kept the ball alive, Sam Hippisley lashed home the leveller with no chance for the keeper.
The goal certainly did more for Oldland's confidence than Calne's. McCallum and Carter both sent sweet left footed efforts just wide before the winner arrived with 79 minutes on the clock. It was McCallum again, finishing into the corner for his sixth goal of the season to send the 15 Oldland fans wild with excitement.
The last chance of the game fell to Boakes but his shot sent wide of goal. An equaliser then would have been rough luck on a hard working team performance from the O's, capped off by three goals from the youngsters McCallum and Hippisley.
Next up on the menu is Bishop Sutton next Saturday at Lake View, kickoff is at the usual time of 3.00pm.