Percentage

Reference data and engineering information about percentage for miscellaneous applications.

percentage

Overview

Engineering reference data for Percentage in miscellaneous.

$y = x \cdot k$

Multiply by conversion factor.

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

For calculating the percentage change between an original value and a new value, use the following formula:

$p = 100\% \times \frac{\text{New Value} - \text{Original Value}}{\text{Original Value}}$

This formula applies to both percentage increases and decreases.

Given part $P = 100000$ and whole $W = 200000$ , the percentage cost of materials is:

$p = 100\% \times \frac{100000}{200000} = 50\%$

Weight of the engine $P = 200 \, \text{kg}$ , total car weight $W = 1500 \, \text{kg}$ . The percentage weight is:

$p = 100\% \times \frac{200}{1500} \approx 13.3\%$

Original price = $100000$ , new price = $120000$ . The percentage increase is:

$p = 100\% \times \frac{120000 - 100000}{100000} = 20\%$

Original price = $100000$ , new price = $80000$ . The percentage decrease is:

$p = 100\% \times \frac{100000 - 80000}{100000} = 20\%$