diff --git a/devtools/client/netmonitor/src/utils/filter-text-utils.js b/devtools/client/netmonitor/src/utils/filter-text-utils.js
index 771979e2ff3a..280e5d085359 100644
--- a/devtools/client/netmonitor/src/utils/filter-text-utils.js
+++ b/devtools/client/netmonitor/src/utils/filter-text-utils.js
@@ -116,10 +116,6 @@ function processFlagFilter(type, value) {
   }
 }
 
-function getSizeOrder(size) {
-  return Math.round(Math.log10(size));
-}
-
 function isFlagFilterMatch(item, { type, value, negative }) {
   let match = true;
   let { responseCookies = { cookies: [] } } = item;
@@ -160,11 +156,11 @@ function isFlagFilterMatch(item, { type, value, negative }) {
       if (item.fromCache) {
         match = false;
       } else {
-        match = getSizeOrder(value) === getSizeOrder(item.transferredSize);
+        match = isSizeMatch(value, item.transferredSize);
       }
       break;
     case "size":
-      match = getSizeOrder(value) === getSizeOrder(item.contentSize);
+      match = isSizeMatch(value, item.contentSize);
       break;
     case "larger-than":
       match = item.contentSize > value;
@@ -216,6 +212,10 @@ function isFlagFilterMatch(item, { type, value, negative }) {
   return match;
 }
 
+function isSizeMatch(value, size) {
+  return value >= (size - size / 10) && value < (size + size / 10);
+}
+
 function isTextFilterMatch({ url }, text) {
   let lowerCaseUrl = url.toLowerCase();
   let lowerCaseText = text.toLowerCase();