Navigator: deviceMemory property

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

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-memory or high-memory devices.


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.`);


Device Memory
# sec-device-memory-js-api

Browser compatibility

BCD tables only load in the browser

See also