diff --git a/packages/utils/src/neckstimate/with-breasts.js b/packages/utils/src/neckstimate/with-breasts.js
index 91ebd245b8a..9818a1308c4 100644
--- a/packages/utils/src/neckstimate/with-breasts.js
+++ b/packages/utils/src/neckstimate/with-breasts.js
@@ -31,7 +31,7 @@ export default {
   neckCircumference: 340,
   seatCircumference: 1010,
   seatDepth: 165,
-  shoulderSlope: 17,
+  shoulderSlope: 13,
   shoulderToElbow: 340,
   shoulderToShoulder: 415,
   shoulderToWrist: 590,
diff --git a/packages/utils/src/neckstimate/without-breasts.js b/packages/utils/src/neckstimate/without-breasts.js
index ecb37895116..670091c4892 100644
--- a/packages/utils/src/neckstimate/without-breasts.js
+++ b/packages/utils/src/neckstimate/without-breasts.js
@@ -24,7 +24,7 @@ export default {
   neckCircumference: 380,
   seatCircumference: 1020,
   seatDepth: 210,
-  shoulderSlope: 17,
+  shoulderSlope: 13,
   shoulderToElbow: 360,
   shoulderToShoulder: 450,
   shoulderToWrist: 630,