- Measure: A number or quantity that records a directly observable value or performance. All measures have a unit attached to them: inch, centimeter, dollar, liter, etc
- Estimate: Approximation, prediction, or projection of a quantity based on experience and/or information available at the time, with the recognition that other pertinent facts are unclear or unknown. An estimate is almost the same as an educated guess, and the cheapest (and least accurate) type of modeling.
- Calculate: To determine, typically in a mathematical sense; analyze; compute. “He had to calculate which of the health care plans would save his family the most money.
Measurement is how we determine the exact capacity of something that is in solid, liquid or gas form. It is the process or the result of determining the ratio of a quantity. Estimating is a process of defining the quantity of the imaginary things .For example we estimate for the cost of production of anything which will be completed (ready) later but we have imagined that it’s cost will reach to this figure.

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