diff --git a/src/js/strength.js b/src/js/strength.js
index 7f6aa15cd24e..b8a2d277e557 100644
--- a/src/js/strength.js
+++ b/src/js/strength.js
@@ -5,13 +5,33 @@ motionsplan.Strength = function(weight, body_weight) {
   body_weight = body_weight;
 
   function getIndex100() {
-   let Loeft = weight;
-   let Vaegt = body_weight;
-    return Math.round(Loeft * 986.63 / (1270.4 - 172970 * ((Math.pow(Vaegt, -1.3925)))) * Math.pow(10, 0)) / Math.pow(10, 0)
+    let Loeft = weight;
+    let Vaegt = body_weight;
+    return Loeft * 986.63 / (1270.4 - 172970 * ((Math.pow(Vaegt, -1.3925))));
+  }
+  
+  function getAllometricScaling() {
+    let S = weight;
+    let M = body_weight;
+    return S * Math.pow(M, -2/3);
+  }
+
+  function getBodyweightPercent() {
+    return weight / body_weight;
+  }
+  
+  function getNuckolsIndex() {
+    let a, b;
+    let w = weight;
+    let bw = body_weight;
+    
+    return 100*w/(a*Math.pow(bw, 2)+b*bw);
   }
 
   let publicAPI = {
-    getIndex100: getIndex100
+    getIndex100 : getIndex100,
+    getAllometricScaling : getAllometricScaling,
+    getBodyweightPercent : getBodyweightPercent
   };
 
   return publicAPI;
diff --git a/src/test/strength.js b/src/test/strength.js
index 25185aff6d7d..b7846f23ca76 100644
--- a/src/test/strength.js
+++ b/src/test/strength.js
@@ -6,7 +6,31 @@ describe('Strength', function() {
     it('should return the correct number', function() {
       // weigt, reps
       let rm = motionsplan.Strength(80, 80);
-      assert.equal(rm.getIndex100(), 89);
+      assert.equal(rm.getIndex100(), 89.36709244049503);
+    });
+  });
+  describe('getAllometricScaling', function() {
+    it('should return the correct number', function() {
+      // weigt, reps
+      let rm = motionsplan.Strength(405, 220);
+      assert.equal(rm.getAllometricScaling(), 11.11321976546847);
+    });
+  });
+  describe('getAllometricScalingSecondTry', function() {
+    it('should return the correct number', function() {
+      let rm = motionsplan.Strength(300, 150);
+      assert.equal(rm.getAllometricScaling(), 10.626585691826113);
+    });
+  });
+  describe('getBodyweightPercent', function() {
+    it('should return the correct number', function() {
+      // weigt, reps
+      let rm = motionsplan.Strength(405, 220);
+      assert.equal(rm.getBodyweightPercent(), 1.8409090909090908);
+    });
+    it('should return the correct number', function() {      
+      let rm = motionsplan.Strength(300, 150);
+      assert.equal(rm.getBodyweightPercent(), 2);
     });
   });
 });