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

Digital beam-combining for stronger, clearer signals -- Target hand-off between adjacent array panels。

演示达到了多项目标：与其他CDL无线电设备实现互操作、用多波束或多信道跟踪、数字波束生成更强、更清楚的信号、目标在邻近阵列板之间传递。

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