Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.


This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The deviceMemory read-only property of the Navigator interface returns the approximate amount of device memory in gigabytes.

The reported value is imprecise to curtail fingerprinting. It’s approximated by rounding down to the nearest power of 2, then dividing that number by 1024. It is then clamped within lower and upper bounds to protect the privacy of owners of very low- or high-memory devices.


memoryAmount = navigator.deviceMemory


A floating point number; one of 0.25, 0.5, 1, 2, 4, 8.


const memory = navigator.deviceMemory
console.log (`This device has at least ${memory}GiB of RAM.`)


Specification Status Comment
Device Memory 1
The definition of 'deviceMemory' in that specification.
Editor's Draft Initial definition.

Browser compatibility

BCD tables only load in the browser

See also