# Maximum Subnormal Base 2 Exponent > The maximum biased base 2 exponent for a subnormal [double-precision floating-point number][ieee754].

## Usage ```javascript var FLOAT64_MAX_BASE2_EXPONENT_SUBNORMAL = require( '@stdlib/constants/float64/max-base2-exponent-subnormal' ); ``` #### FLOAT64_MAX_BASE2_EXPONENT_SUBNORMAL The maximum biased base 2 exponent for a subnormal [double-precision floating-point number][ieee754]. ```javascript var bool = ( FLOAT64_MAX_BASE2_EXPONENT_SUBNORMAL === -1023 ); // returns true ```

## Examples ```javascript var FLOAT64_MAX_BASE2_EXPONENT_SUBNORMAL = require( '@stdlib/constants/float64/max-base2-exponent-subnormal' ); console.log( FLOAT64_MAX_BASE2_EXPONENT_SUBNORMAL ); // => -1023 ```

[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985