Your calculation is way off beam.

你的计算完全错误。

《牛津词典》

I've come to realize what I said at the meeting was off beam.

我已经了解到我在会议中所讲的话是错误的。

youdao

The neutrinos that emerge at Gran Sasso start off as a beam of proton particles at Cern.

格朗萨索实验室测到的中微子来自欧洲核子研究中心的质子粒子束。

youdao

The carpenter singing his, as he measures his plank or beam, The mason singing his, as he makes ready for work, or leaves off work;

VOA: special.2009.04.12

The Indian Ocean was displayed as a large sea surrounded by land, while many of his measurements of longitude (something that was very hard to measure accurately until John Harrison's timepiece won a famous competition in the 18th century) were way off beam.

WSJ: Lost in Our Maps: A History of Cartographic Catastrophes

After flipping off the beam, the judges gave her a score that put her in fourth place.

WSJ: Social Media

His disquisition on light, aimed at disproving Newton, was way off-beam.

ECONOMIST: Goethe