Measuring happiness, which is a highly subjective emotion, is akin to getting your eye tested through the various lenses for your correct eye prescription number.

Measuring something as subjective as happiness can still provide usable results through the process of asking a critic...

Measuring your food can give you an idea of what a serving looks like. Measuring cups are handy, but they're even better when used with the scale. Weighing gives you a better understanding of a serving.

If you don't have a scale or cups, there are some very rough ways ...

Critics state that facial expressions are not the measurement of emotions. Measuring what someone actually feels is difficult to do with anything other than self-report. However, even this methodology is inefficient since the memory for emotional experience is highly unreliable.