🛡️ OSRS Accuracy Calculator

👤 Player Stats

Effective Attack Level:


Attack Bonus (Style-specific):

🎯 Target Stats

Target Defense Level:


Defense Bonus (Style-specific):

⚔️ Attack Style

Melee Ranged Magic

⚙️ Calculate Accuracy

🛡️ OSRS Accuracy Calculator

Use this OSRS Accuracy Calculator to find out how likely your attacks are to hit your target in Old School RuneScape. Simply input your effective attack level, your gear’s attack bonus, and your enemy’s defense level and defense bonus. This calculator uses the same formulas as found in-game to give you an accurate hit chance percentage. Whether you are slaying bosses, PvMing, or completing Slayer tasks, this tool helps you optimize your loadout and maximize your DPS.

👣 How to Use:

• Input your Effective Attack Level and Attack Bonus (both style-specific).
• Input the Target Defense Level and Defense Bonus.
• Select your attack style: Melee, Ranged, or Magic.
• Click “Calculate Accuracy” to get your hit chance.

👤 Player Stats

Effective Attack Level:


Attack Bonus (Style-specific):

🎯 Target Stats

Target Defense Level:


Defense Bonus (Style-specific):

⚔️ Attack Style

Melee Ranged Magic

⚙️ Calculate Accuracy

🔍 How is Accuracy Calculated?

The hit chance is based on your attack roll and the enemy’s defense roll. The formula used:

attackRoll = effectiveAttackLevel × (attackBonus + 64)
defenseRoll = defenseLevel × (defenseBonus + 64)

if attackRoll > defenseRoll:
  hitChance = 1 - ((defenseRoll + 2) / (2 × (attackRoll + 1)))
else:
  hitChance = attackRoll / (2 × (defenseRoll + 1))

✅ Why Use This Calculator?

• Plan gear loadouts for Slayer, PvM, and PvP scenarios.
• Compare different attack styles and gear setups.
• Quickly identify whether you need to switch prayers, potions, or gear to improve hit chance.

❓ Frequently Asked Questions

Q: What is “Effective Attack Level”?
A: Your base level + potion boosts + prayer boosts + attack style bonuses.

Q: Does this tool account for monsters’ hidden defense?
A: You need to input the monster’s public defense level and style-specific defense bonus.

Q: Does it work for all combat styles?
A: Yes! Select Melee, Ranged, or Magic from the dropdown.

Q: Can I save my results?
A: Copy and paste the results or bookmark the calculator page with your stats filled in.