diff --git a/src/common/Util/UtilMath.cpp b/src/common/Util/UtilMath.cpp
index ca6cd7d8..b5a1511b 100644
--- a/src/common/Util/UtilMath.cpp
+++ b/src/common/Util/UtilMath.cpp
@@ -133,3 +133,13 @@ float Util::eulerToDirection( const FFXIVARR_POSITION3 &euler )
 
   return atan2f( v2, v1 );
 }
+
+float Util::trunc( float value, uint8_t digitsToRemain )
+{
+  if( digitsToRemain == 0 )
+    return std::floor( value );
+
+  float factor = std::pow( 10, digitsToRemain );
+
+  return std::floor( value * factor ) / factor;
+}
diff --git a/src/common/Util/UtilMath.h b/src/common/Util/UtilMath.h
index d9849477..1f6ddd50 100644
--- a/src/common/Util/UtilMath.h
+++ b/src/common/Util/UtilMath.h
@@ -21,6 +21,8 @@ namespace Sapphire::Common::Util
 
   float calcAngFrom( float x, float y, float x1, float y1 );
 
+  float trunc( float value, uint8_t digitsToRemain );
+
   uint16_t floatToUInt16( float val );
 
   uint16_t floatToUInt16Rot( float val );
diff --git a/src/world/Math/CalcStats.cpp b/src/world/Math/CalcStats.cpp
index 4c05e593..74ccf7a9 100644
--- a/src/world/Math/CalcStats.cpp
+++ b/src/world/Math/CalcStats.cpp
@@ -7,6 +7,7 @@
 
 #include "Actor/Chara.h"
 #include "Actor/Player.h"
+#include "Util/UtilMath.h"
 
 #include "Inventory/Item.h"
 
@@ -408,8 +409,7 @@ float CalcStats::calcAttackPower( const Sapphire::Entity::Chara& chara, uint32_t
   auto mainVal = static_cast< float >( levelTable[ level ][ Common::LevelTableEntry::MAIN ] );
   auto divVal = static_cast< float >( levelTable[ level ][ Common::LevelTableEntry::DIV ] );
 
-  // todo: not sure if its ( ap - mv ) / mv or ( ap - mv ) / dv
-  return std::floor( ( 125.f * ( attackPower - mainVal ) / divVal ) + 100.f ) / 100.f;
+  return Common::Util::trunc( static_cast< float >( attackPower ) / divVal + ( 1.0f - mainVal / divVal ), 2 );
 }
 
 float CalcStats::getPrimaryAttackPower( const Sapphire::Entity::Chara& chara )
@@ -456,7 +456,7 @@ float CalcStats::determination( const Sapphire::Entity::Chara& chara )
   auto mainVal = static_cast< float >( levelTable[ level ][ Common::LevelTableEntry::MAIN ] );
   auto divVal = static_cast< float >( levelTable[ level ][ Common::LevelTableEntry::DIV ] );
 
-  return std::floor( 130.f * ( chara.getStatValue( Common::BaseParam::Determination ) - mainVal ) / divVal + 1000.f ) / 1000.f;
+  return Common::Util::trunc( 1.0f + ( chara.getStatValue( Common::BaseParam::Determination ) - mainVal ) / divVal, 3 );
 }
 
 float CalcStats::tenacity( const Sapphire::Entity::Chara& chara )
@@ -575,7 +575,7 @@ std::pair< float, Sapphire::Common::ActionHitSeverityType > CalcStats::calcAutoA
 
 
   // todo: everything after tenacity
-  auto factor = std::floor( pot * aa * ap * det );
+  auto factor = Common::Util::trunc( pot * aa * ap * det, 0 );
   Sapphire::Common::ActionHitSeverityType hitType = Sapphire::Common::ActionHitSeverityType::NormalDamage;
 
   // todo: traits
@@ -624,11 +624,7 @@ std::pair< float, Sapphire::Common::ActionHitSeverityType > CalcStats::calcActio
   auto ap = getPrimaryAttackPower( chara );
   auto det = determination( chara );
 
-  auto ten = 1.f;
-  if( chara.getRole() == Common::Role::Tank )
-    ten = tenacity( chara );
-
-  auto factor = std::floor( pot * wd * ap * det * ten );
+  auto factor = Common::Util::trunc( pot * wd * ap * det, 0 );
   Sapphire::Common::ActionHitSeverityType hitType = Sapphire::Common::ActionHitSeverityType::NormalDamage;
 
   if( criticalHitProbability( chara ) > range100( rng ) )
@@ -649,15 +645,15 @@ std::pair< float, Sapphire::Common::ActionHitSeverityType > CalcStats::calcActio
 
   // todo: buffs
 
-  constexpr auto format = "dmg: pot: {} ({}) wd: {} ({}) ap: {} det: {} ten: {} = {}";
+  constexpr auto format = "dmg: pot: {} ({}) wd: {} ({}) ap: {} det: {}  = {}";
 
   if( auto player = const_cast< Entity::Chara& >( chara ).getAsPlayer() )
   {
-    PlayerMgr::sendDebug( *player, format, pot, ptc, wd, wepDmg, ap, det, ten, factor );
+    PlayerMgr::sendDebug( *player, format, pot, ptc, wd, wepDmg, ap, det, factor );
   }
   else
   {
-    Logger::debug( format, pot, ptc, wd, wepDmg, ap, det, ten, factor );
+    Logger::debug( format, pot, ptc, wd, wepDmg, ap, det, factor );
   }
 
   return std::pair( factor, hitType );