diff --git a/contracts/mtoken/Move.lock b/contracts/mtoken/Move.lock
index a8ec04a..e04d997 100644
--- a/contracts/mtoken/Move.lock
+++ b/contracts/mtoken/Move.lock
@@ -2,7 +2,7 @@
 
 [move]
 version = 3
-manifest_digest = "621AB19773C2DEDCF619E96217605A9FF2BC18173F9DF2D50083C0CE7C974030"
+manifest_digest = "1253F4654A86D7FC13E19FC669EA78F29BAC19E2F349101A7A9C44F1BB8E18CC"
 deps_digest = "3C4103934B1E040BB6B23F1D610B4EF9F2F1166A50A104EADCF77467C004C600"
 dependencies = [
   { id = "Sui", name = "Sui" },
diff --git a/contracts/mtoken/sources/mtoken.move b/contracts/mtoken/sources/mtoken.move
index 0cb9a12..2eee410 100644
--- a/contracts/mtoken/sources/mtoken.move
+++ b/contracts/mtoken/sources/mtoken.move
@@ -174,22 +174,8 @@ module mtoken::mtoken {
         // Ensure current time is within the valid range
         assert!(current_time >= manager.start_time_s, ERedeemingBeforeStartTime);
 
-        // Interpolate penalty linearly
-        let end_penalty = decimal::from(manager.end_penalty_numerator)
-                .mul(decimal::from(withdraw_amount))
-                .div(decimal::from(manager.penalty_denominator));
-
-        let penalty_amount = if (current_time < manager.end_time_s) {
-            let start_penalty = decimal::from(manager.start_penalty_numerator)
-                .mul(decimal::from(withdraw_amount))
-                .div(decimal::from(manager.penalty_denominator));
-
-            let time_weight = decimal::from(manager.end_time_s)
-                .sub(decimal::from(current_time))
-                .div(decimal::from(manager.end_time_s).sub(decimal::from(manager.start_time_s)));
-            
-            start_penalty.mul(time_weight).add(end_penalty.mul(decimal::from(1).sub(time_weight))).ceil()
-        } else { end_penalty.ceil() };
+        // Get penalty amount
+        let penalty_amount = manager.get_penalty_amount(withdraw_amount, clock);
 
         assert!(penalty_coin.value() >= penalty_amount, ENotEnoughPenaltyFunds);
 
@@ -234,6 +220,33 @@ module mtoken::mtoken {
         coin::from_balance(balance, ctx)
     }
 
+    public fun get_penalty_amount<MToken, Vesting, Penalty>(
+        manager: &VestingManager<MToken, Vesting, Penalty>,
+        mtoken_burn_amount: u64,
+        clock: &Clock,
+    ): u64 {
+        let current_time = clock::timestamp_ms(clock) / 1000;
+
+        // Interpolate penalty linearly
+        let end_penalty = decimal::from(manager.end_penalty_numerator)
+                .mul(decimal::from(mtoken_burn_amount))
+                .div(decimal::from(manager.penalty_denominator));
+
+        let penalty_amount = if (current_time < manager.end_time_s) {
+            let start_penalty = decimal::from(manager.start_penalty_numerator)
+                .mul(decimal::from(mtoken_burn_amount))
+                .div(decimal::from(manager.penalty_denominator));
+
+            let time_weight = decimal::from(manager.end_time_s)
+                .sub(decimal::from(current_time))
+                .div(decimal::from(manager.end_time_s).sub(decimal::from(manager.start_time_s)));
+            
+            start_penalty.mul(time_weight).add(end_penalty.mul(decimal::from(1).sub(time_weight))).ceil()
+        } else { end_penalty.ceil() };
+
+        penalty_amount
+    }
+
     // ===== View functions =====
 
     public fun manager<MToken, Vesting, Penalty>(admin_cap: &AdminCap<MToken, Vesting, Penalty>): ID { admin_cap.id.to_inner() }