diff --git a/src/utils.js b/src/utils.js
index b2c96f9..2742a7b 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -458,8 +458,8 @@ function getWH(elem, name, ex) {
   const which = name === 'width' ? ['Left', 'Right'] : ['Top', 'Bottom'];
   let borderBoxValue =
     name === 'width'
-      ? Math.floor(elem.getBoundingClientRect().width)
-      : Math.floor(elem.getBoundingClientRect().height);
+      ? Math.ceil(elem.getBoundingClientRect().width)
+      : Math.ceil(elem.getBoundingClientRect().height);
   const isBorderBox = isBorderBoxFn(elem);
   let cssBoxValue = 0;
   if (
@@ -478,7 +478,7 @@ function getWH(elem, name, ex) {
       cssBoxValue = elem.style[name] || 0;
     }
     // Normalize '', auto, and prepare for extra
-    cssBoxValue = Math.floor(parseFloat(cssBoxValue)) || 0;
+    cssBoxValue = Math.ceil(parseFloat(cssBoxValue)) || 0;
   }
   if (extra === undefined) {
     extra = isBorderBox ? BORDER_INDEX : CONTENT_INDEX;