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---
title: kinds
---
# The `stdlib_kinds` module
[TOC]
## Introduction
The `stdlib_kinds` module provides kind parameters for the Fortran intrinsic data types,
*integer*, *logical*, *real*, and *complex*.
## Constants provided by `stdlib_kinds`
### `sp`
Single precision real kind parameter.
Provides real kind parameter for floating point numbers with a minimal precision of 6 significant digits.
### `dp`
Double precision real kind parameter.
Provides real kind parameter for floating point numbers with a minimal precision of 15 significant digits.
### `xdp`
Extended double precision real kind parameter.
Provides real kind parameter for floating point numbers with a minimal precision of 18 significant digits.
If not available it has value `-1`.
### `qp`
Quadruple precision real kind parameter.
Provides real kind parameter for floating point numbers with a minimal precision of 33 significant digits.
If not available it has value `-1`.
### `int8`
Reexported intrinsic named constant `int8` from `iso_fortran_env`.
### `int16`
Reexported intrinsic named constant `int16` from `iso_fortran_env`.
### `int32`
Reexported intrinsic named constant `int32` from `iso_fortran_env`.
### `int64`
Reexported intrinsic named constant `int64` from `iso_fortran_env`.
### `lk`
Kind parameter of the default logical data type.
### `c_bool`
Reexported intrinsic named constant `c_bool` from `iso_c_binding`.
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