diff --git a/src/traces/box/attributes.js b/src/traces/box/attributes.js
index 98aa92f6f64..fdd2e6e4d7a 100644
--- a/src/traces/box/attributes.js
+++ b/src/traces/box/attributes.js
@@ -96,12 +96,12 @@ module.exports = {
     notchwidth: {
         valType: 'number',
         min: 0,
-        max: 1,
+        max: 0.5,
         dflt: 0.25,
         role: 'style',
         editType: 'calcIfAutorange',
         description: [
-            'Sets the width of the notches inversely proportional to',
+            'Sets the width of the notches relative to',
             'the box\' width.',
             'For example, with 0, the notches are as wide as the box(es).'
         ].join(' ')
diff --git a/src/traces/box/plot.js b/src/traces/box/plot.js
index a5f953278d9..f1121f9982e 100644
--- a/src/traces/box/plot.js
+++ b/src/traces/box/plot.js
@@ -102,7 +102,7 @@ function plotBoxAndWhiskers(sel, axes, trace, t) {
     var bPosPxOffset = t.bPosPxOffset || 0;
     var whiskerWidth = trace.whiskerwidth || 0;
     var notched = trace.notched || false;
-    var nw = notched ? 1 - trace.notchwidth : 1;
+    var nw = notched ? 1 - 2 * trace.notchwidth : 1;
 
     // to support for one-sided box
     var bdPos0;
diff --git a/test/image/baselines/box_horz_notched.png b/test/image/baselines/box_horz_notched.png
index 91452404315..1f6d737725f 100644
Binary files a/test/image/baselines/box_horz_notched.png and b/test/image/baselines/box_horz_notched.png differ
diff --git a/test/image/baselines/box_notched.png b/test/image/baselines/box_notched.png
index 3fdf5ab3165..c2449e12d04 100644
Binary files a/test/image/baselines/box_notched.png and b/test/image/baselines/box_notched.png differ