Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

# Percentage

## Working with relative values.

Percentage can be calculated as

p = 100% P / W                             (1)

where

p = percentage (%)

P = part

W = whole

### Example - Contractors Materials

A contractor spent an amount of 100000 for materials in a custom home project. The total cost of the project was 200000. The materials percentage cost can be calculated as

p = 100% (100000) / (200000)

= 50%

### Example - Weight of Engine

Weight of an engine is 200 kg. The total weight of the car is 1500 kg. The percentage weight of the engine can be calculated as

p = 100% (200 kg) / (1500 kg)

= 13.3%

### Example - Increasing Price

The cost of a contract increase from 100000 to 120000. The percentage increase of the contract price can be calculated as

p = 100% (120000 - 100000) / (100000)

= 20%

### Example - Decreasing Price

The cost of a contract decrease from 100000 to 80000. The percentage decrease of the contract price can be calculated as

p = 100% (100000 - 80000) / (100000)

= 20%

## Related Topics

• ### Economics

Engineering economics - cash flow diagrams, present value, discount rates, internal rates of return - IRR, income taxes, inflation.
• ### Mathematics

Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more.

## Related Documents

• ### Contract Types

Commonly used engineering and construction contracts.
• ### Discrete Compounding Cash Flow Formulas

Discrete payments compounding equations and online calculators .
• ### Predicted Mean Vote Index (PMV)

PMV index predicts mean comfort response of a larger group of people.
• ### Ratios and Proportions

The relative values between quantities - ratios and proportions.

• ### Solubility

The amount of a solute that can be dissolved in a solvent.
• ### Uniformat

The ASTM E1557 UNIFORMAT II Standard.

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## Citation

• The Engineering ToolBox (2010). Percentage. [online] Available at: https://www.engineeringtoolbox.com/percentage-d_1705.html [Accessed Day Month Year].

Modify the access date according your visit.

9.27.11