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The StorageEstimate dictionary's quota property is a conservative approximation of how much storage is allotted to the origin or Web app that called StorageManager.estimate(); there may be more space available, but there will not be less. This value is an estimate to help prevent its use for fingerprinting—that is, identifying a device using an amalgamation of the values of seemingly innocuous properties.


quota = StorageEstimate.quota;


A numeric value specifying an approximation of the total amount of storage space available for use by the application.


In this example, we obtain the usage estimates and present the percentage of storage capacity currently used to the user.

HTML content

  You're currently using about <span id="percent">
  </span>% of your available storage.

JavaScript content

navigator.storage.estimate().then(function(estimate) {
  document.getElementById("percent").innerHTML =
      (estimate.usage / estimate.quota).toFixed(2);


Document Tags and Contributors

 Contributors to this page: chrisdavidmills, Sheppy
 Last updated by: chrisdavidmills,