diff --git a/build.js b/build.js
index ebc0dac..9b0c220 100644
--- a/build.js
+++ b/build.js
@@ -197,11 +197,29 @@ class Build{
         return damages_results.concat([totalDamNorm,totalDamCrit,normDPS,critDPS,avgDPS,adjAtkSpd]);
     }
 
+    /*
+     * Gets a list of active sets and set counts.
+     */
+    getSetBonuses() {
+        let activeSetCounts = new Map()
+        for (const item of this.items) {
+            console.log(item.get("name"));
+            const setName = setMap.get(item.get("name"));
+            if (setName) { // undefined/null means no set.
+                activeSetCounts.set(setName, (activeSetCounts.get(setName) || 0) + 1);
+            }
+        }
+        return activeSetCounts;
+    }
+
     /*  Get all stats for this build. Stores in this.statMap.
         @pre The build itself should be valid. No checking of validity of pieces is done here.
     */
     initBuildStats(){
 
+        let activeSetCounts = this.getSetBonuses();
+        this.activeSetCounts = activeSetCounts;
+
         let staticIDs = ["hp", "eDef", "tDef", "wDef", "fDef", "aDef"];
 
         //Create a map of this build's stats
@@ -221,6 +239,12 @@ class Build{
                 if (item.get(staticID)) { statMap.set(staticID, statMap.get(staticID) + item.get(staticID)); }
             }
         }
+        for (const [setName, count] of activeSetCounts) {
+            const bonus = sets[setName].bonuses[count-1];
+            for (const id in bonus) {
+                statMap.set(id,(statMap.get(id) || 0)+bonus[id]);
+            }
+        }
 
         // The stuff relevant for damage calculation!!! @ferricles
         statMap.set("atkSpd", this.weapon.get("atkSpd"));
diff --git a/display.js b/display.js
index 8d48a0d..32cfad6 100644
--- a/display.js
+++ b/display.js
@@ -119,6 +119,19 @@ function displayBuildStats(build, parent_id){
     setHTML(parent_id, "");
     let parent_div = document.getElementById(parent_id);
 
+    let set_summary_elem = document.createElement('p');
+    set_summary_elem.classList.add('itemp');
+    set_summary_elem.classList.add('left');
+    set_summary_elem.textContent = "Set Summary:";
+    parent_div.append(set_summary_elem);
+    for (const [setName, count] of build.activeSetCounts) {
+        let set_elem = document.createElement('p');
+        set_elem.classList.add('itemp');
+        set_elem.classList.add('left');
+        set_elem.textContent = "    "+setName+" Set: "+count+"/"+sets[setName].items.length;
+        set_summary_elem.append(set_elem);
+    }
+
     let stats = build.statMap;
     
     let active_elem;
diff --git a/test.js b/test.js
index d18969c..41a30e0 100644
--- a/test.js
+++ b/test.js
@@ -96,6 +96,8 @@ for (const it of itemTypes) {
     itemLists.set(it, []);
 }
 let itemMap = new Map();
+/* Mapping from item names to set names. */
+let setMap = new Map();
 let idMap = new Map();
 
 /*
@@ -159,6 +161,13 @@ function init() {
         itemMap.set(item.displayName, item);
         idMap.set(item.id, item.displayName);
     }
+
+    for (const setName in sets) {
+        const set = sets[setName];
+        for (const itemName of set.items) {
+            setMap.set(itemName, setName);
+        }
+    }
     
     for (const armorType of armorTypes) {
         populateItemList(armorType);