Damage Formula

Compare classic RPG damage formulas across defense values.

What it does

Side-by-side comparison of the four common formulas: ATK - DEF, ATK * (1 - DEF/(DEF+k)), ATK^2 / DEF, and ATK * (100/(100+DEF)). See which one keeps combat interesting at every DEF tier.

How to use it

Enter ATK and a DEF range. The chart plots final damage per formula across that range.

Designer tip

**ATK * (1 - DEF/(DEF+k))** with k≈100 is the modern standard — it scales gracefully without making high-DEF enemies invincible.

Open the calculator

Open it at /calculators/damage-formula. Calculators run entirely in your browser — no credits charged.

Ready to try it?

Open the generator →