诺莫图（Nomogram）是一种利用图像来进行计算（查图）的工具，是一个二维的图像，用来进行非精确的计算。其使用的坐标系不同于笛卡尔坐标系。用另一种方式来解释，诺谟图是一个带有坐标的二维函数图像，通过它，如果已知了第n-1个参数，就可以用来查得第n个参数，或者通过固定一些参数来研究固定参数和未固定参数之间的关系。就像计算尺一样，诺谟图是一种图形计算工具，其精度也取决于查图时的数据点在图上点出、引申的准确程度，直线直的程度。诺谟图大多用于非精确的计算满足实际使用的精度要求的情况。此外，诺谟图也用于检查精确计算方法的结果。

A nomogram (from Greek νόμος nomos, "law" and γραμμή grammē, "line"), also called a nomograph, alignment chart or abaque, is a graphical calculating device, a two-dimensional diagram designed to allow the approximate graphical computation of a mathematical function. The field of nomography was invented in 1884 by the French engineer Philbert Maurice d’Ocagne (1862-1938) and used extensively for many years to provide engineers with fast graphical calculations of complicated formulas to a practical precision. Nomograms use a parallel coordinate system invented by d'Ocagne rather than standard Cartesian coordinates.