Scale

**Scale** could mean:
- Weighing scale Weighing scale used for measurement of weight (mass or force)
- Scale (map)
- Scale (ratio)
    - Scale factor
- Scalability in computing
- Scale (zoology)
    - Zoology: Scale insect, plant parasites which resemble animal scales
- Scale parameter, probability and statistics
- Logarithmic scale, mathematics
- Order of magnitude
- Architect's scale — (or draughtsman's scale) is a ruler-like device, which facilitates the production of technical drawings.
- Engineer's scale
- Zadok scale cereal development
- Screen Actors Guild wage standards
- Mizan or _Balance_ is a comprehensive treatise on the contents of Islam written by Javed Ahmed Ghamidi, a Pakistani Sunni Islamic scholar.

## Astronomy

- Palermo Technical Impact Hazard Scale
- Torino Scale
- Solar flare energy intensity
- The constellation Libra (constellation) (Latin for _scale_) and the zodiac sign Libra (astrology)

### Electronegativity

- Allred-Rochow scale
- Mulliken scale
- Pauling scale

### Radiodensity

- The Hounsfield Scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radio-density of distilled water at standard pressure and temperature (STP) is defined as zero **Hounsfield units** (HU), while the radiodensity of air at STP is defined as -1000 HU.

### Relative density or specific gravity

- The Baumé scale measures specific gravity or relative density.
- Brix scale / Degrees **Brix** (symbol °Bx) is the sugar content of an aqueous solution. One degree **Brix** is 1 gram of sucrose in 100 grams of solution and represents the strength of the solution as percentage by mass.
- Plato scale
- Twaddell scale

### Temperature

- Celsius
- Fahrenheit
- Réaumur scale

## Earth science

- Beaufort scale (wind)
- Fujita scale (tornadoes)
- Mohs scale of mineral hardness
- Saffir-Simpson Hurricane Scale
- Okta (cloud cover) - a unit of measurement used to describe the amount of cloud cover at any given location such as a weather station. Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to **8** oktas (completely overcast).

## Economics

- Scale (economics)
- Resource-Based Relative Value Scale, returns to scale

## In medicine

Bristol stool scale

## Music

- Scale (music)
    - Bohlen-Pierce scale
    - Chromatic scale
    - Deutsch's scale illusion
    - Diminished scale
    - Mathematics of musical scales
    - Major scale
    - Minor scale
- Scale (string instruments)
- _Scale_ (album), an album by electronic artist Matthew Herbert

## Scale models

- Scale model
- 2 mm scale
- HO scale
- O scale

## Social science

- Kinsey scale, sexual orientation
- Likert scale, questionnaire format
- Phrase completions, questionnaire format

## Miscellaneous

- The Goldberg scale measures mania and depression.
- The Liebowitz social anxiety scale measures the severity of social anxiety disorder.
- The Medvedev-Sponheuer-Karnik scale and the Mercalli scale measure the intensity of earthquakes.
- The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals.
- The Richter scale, a mathematical device to compare the size of earthquakes.
- The Scoville Scale measures the hotness of peppers.
- The Apgar score is determined by evaluating the newborn baby on five simple criteria on a scale from zero to two, then summing up the five values thus obtained. The resulting Apgar score ranges from zero to 10. The five criteria are summarized using words chosen to form a backronym (**A**ppearance, **P**ulse, **G**rimace, **A**ctivity, **R**espiration).