diff --git a/src/lib/DamageCalculator.svelte b/src/lib/DamageCalculator.svelte
index 8c6daf3..28f5e39 100644
--- a/src/lib/DamageCalculator.svelte
+++ b/src/lib/DamageCalculator.svelte
@@ -20,6 +20,7 @@
   let total_min_damage = 0;
   let total_max_damage_percentage = 0;
   let total_min_damage_percentage = 0;
+  let item_magnification = 1.0;
   function calculate_damage() {
     let attacker;
     let defender;
@@ -190,6 +191,8 @@
     data.minDamage = Math.trunc(data.minDamage * magnification_terastype);
     data.maxDamage = Math.trunc(data.maxDamage * magnification);
     data.minDamage = Math.trunc(data.minDamage * magnification);
+    data.maxDamage = Math.trunc(data.maxDamage * item_magnification);
+    data.minDamage = Math.trunc(data.minDamage * item_magnification);
 
     return data;
   }
@@ -250,6 +253,12 @@
           bind:group={attack_direction}
         /> P2 ->> P1
       </td>
+      <td>
+        <input
+          type="text"
+          bind:value={item_magnification}
+        />
+      </td>
     </tr>
     <tr>
       <td>
diff --git a/src/lib/DisplayData.svelte b/src/lib/DisplayData.svelte
index b691487..b35125a 100644
--- a/src/lib/DisplayData.svelte
+++ b/src/lib/DisplayData.svelte
@@ -13,6 +13,18 @@
     }
     return v;
   }
+  function level_validator(v) {
+    if (typeof v !== "number") {
+      return null;
+    }
+    if (v > 100) {
+      return 100;
+    }
+    if (v < 1) {
+      return 1;
+    }
+    return v;
+  }
   const available_type = [
     { id: 1 },
     { id: 2 },
@@ -47,6 +59,7 @@
   }
   $: {
     // validator
+    level = level_validator(level);
     hp_v = v_validator(hp_v);
     atk_v = v_validator(atk_v);
     def_v = v_validator(def_v);
@@ -261,7 +274,7 @@
   export let spdef_final = 0;
   export let spd_final = 0;
   export let terastype = [0];
-
+  let level = 50;
   let selected_terastype = 0;
   let atk_plus = false;
   let def_plus = false;
@@ -275,10 +288,12 @@
   let spdef_minus = false;
   let spd_minus = false;
   function calculate_hp(stat, v, d) {
-    return Math.floor(((stat*2+v+(d/4))*0.5)+50+10)
+    // floor({(種族値+個体値)×2+min(63,floor(floor(1+√努力値)÷4))}×レベル÷100)+レベル+10
+    return Math.floor(((stat*2+v+(d/4))*(level/100))+level+10)
   }
   function other_stats(stat, v, d, p) {
-    return Math.floor((((stat*2+v+(d/4))*0.5)+5)*p)
+    // floor({(種族値+個体値)×2+min(63,floor(floor(1+√努力値)÷4))}×レベル÷100)+5
+    return Math.floor((((stat*2+v+(d/4))*(level/100))+5)*p)
   }
   let abilities = [];
   let abilities_description = [];
@@ -397,6 +412,11 @@
         <td class="atai-column"><b>{pokemonData.hp + pokemonData.attack + pokemonData.defense + pokemonData.special_attack + pokemonData.special_defense + pokemonData.speed}</b></td>
         <td class="atai-column"></td>
       </tr>
+      <tr>
+        <td class="value-column"><b>Level</b></td>
+        <td class="atai-column"><input class="vd-input" type=number bind:value={level} min=1 max=100></td>
+        <td class="atai-column"></td>
+      </tr>
     </table>
   </div>
   {:else}