推算的英文：
calculate an amount
extrapolate

参考例句：

failure predication
故障预测[推算]

cast a horoscope
以占星术算命;推算八字

Projections of increases in numBer of households
对户数的增加的推算

Densitometry was used to calculate peak particle diameters.
使用密度计去推算粒孚的最大直径。

Choosing such a tide, I hoped for a glimpse of the pool. The ebb was to fall early in the morning.
我选好这样一个低潮的时机，希望能看一眼水潭。根据推算，潮水将在清晨退下去。

The scaling procedure is by no means exact, but it is probably adequate in the circumstances
这种推算方法，不能说很准确，但是，在这种情况下，或许也算是一种合适的方法。

calculate是什么意思：
v. 计算，推测

These are the calculating formulas.
这些是计算公式。

Please calculate quotient and remainder.
请计算商和余数。

Program a computer for pay calculations
为计算机计算工资作程序设计

amount是什么意思：
v. 总计，共达；等于，相当于
n. 金额；数量，数额

amount deposited
存款金额

A small amount of liquid;a drop.
少量液体；一滴

My savings amount to $2001.
我的储蓄共达2000 美元。

extrapolate是什么意思：
v. 推断

Her detective method is extrapolation.
她侦探的方法是推理。

It is unhelpful to extrapolate general trends from one case.
根据一个案例来推断总的趋势是没有用的。

At the macroscopic level, an ideal gas was defined by a process of extrapolation.
从宏观角度看，理想气体的定义是由推论而得来的。