# Function: encephalizationQuotient()

[**lifecycle-kit**](https://jonbogaty.com/lifecycle-kit/api/readme/index.md)

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[lifecycle-kit](https://jonbogaty.com/lifecycle-kit/api/readme/index.md) / [bio-laws](https://jonbogaty.com/lifecycle-kit/api/bio-laws/readme/index.md) / encephalizationQuotient


# Function: encephalizationQuotient() {#function-encephalizationquotient}


> **encephalizationQuotient**(`brainMassKg`, `bodyMassKg`): `number`

Defined in: [bio-laws/lifeHistory.ts:136](https://github.com/jbcom/lifecycle-kit/blob/074e4e7b8038d3e2de9eb44c4b5b5aee0ef02b48/src/bio-laws/lifeHistory.ts#L136)

Encephalization quotient — brain mass relative to what body size predicts.

Source: Jerison (1973), as above.

EQ ~1 is average for a mammal; 4-5 is elephant or dolphin; ~7 is human. It
is the honest way to say "how clever is it" without inventing a stat.


## Parameters {#parameters}



### brainMassKg {#brainmasskg}


`number`


### bodyMassKg {#bodymasskg}


`number`


## Returns {#returns}


`number`