diff --git a/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.html b/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.html
index 929ea3a90..728185195 100644
--- a/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.html
+++ b/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.html
@@ -218,6 +218,11 @@
             [clearable]="false"
           ></my-select-custom-value>
 
+          <div i18n class="transcoding-information" *ngIf="isTranscodingInformationDisplayed()">
+            Transcoding is enabled. The video quota only takes into account <strong>original</strong> video size. <br />
+            At most, a user could upload ~ {{ computeQuotaWithTranscoding() | bytes: 0 }}.
+          </div>
+
           <div *ngIf="formErrors.user.videoQuota" class="form-error">{{ formErrors.user.videoQuota }}</div>
         </div>
 
diff --git a/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.ts b/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.ts
index 90ed58c99..dc7802b2c 100644
--- a/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.ts
+++ b/client/src/app/+admin/config/edit-custom-config/edit-basic-configuration.component.ts
@@ -3,7 +3,7 @@ import { SelectOptionsItem } from 'src/types/select-options-item.model'
 import { Component, Input, OnChanges, OnInit, SimpleChanges } from '@angular/core'
 import { FormGroup } from '@angular/forms'
 import { MenuService, ThemeService } from '@app/core'
-import { HTMLServerConfig } from '@shared/models'
+import { HTMLServerConfig, VideoResolution } from '@shared/models'
 import { ConfigService } from '../shared/config.service'
 
 @Component({
@@ -92,6 +92,28 @@ export class EditBasicConfigurationComponent implements OnInit, OnChanges {
     return this.form.value['followings']['instance']['autoFollowIndex']['enabled'] === true
   }
 
+  computeQuotaWithTranscoding () {
+    const transcodingConfig = this.serverConfig.transcoding
+
+    const resolutions = transcodingConfig.enabledResolutions
+    const higherResolution = VideoResolution.H_4K
+    let multiplier = 0
+
+    for (const resolution of resolutions) {
+      multiplier += resolution / higherResolution
+    }
+
+    if (transcodingConfig.hls.enabled) multiplier *= 2
+
+    return multiplier * parseInt(this.form.value['user']['videoQuota'], 10)
+  }
+
+  isTranscodingInformationDisplayed () {
+    const formVideoQuota = parseInt(this.form.value['user']['videoQuota'], 10)
+    return this.serverConfig.transcoding.enabledResolutions.length !== 0 &&
+           formVideoQuota > 0
+  }
+
   buildLandingPageOptions () {
     this.defaultLandingPageOptions = this.menuService.buildCommonLinks(this.serverConfig)
       .links