Summoner's War Calculator

Summoners War Calculator is a stat calculator for the mobile game Summoners War. It shows final monster stats and damage values for each skill based on rune bonuses and skill formulas.

What it solves

It helps calculate what a monster’s actual stats and skill damage will be after rune bonuses are added. It also evaluates skill formulas into concrete damage numbers, including critical hits.

Instead of working from formula text alone, it turns base stats and skill multipliers into displayed results for a chosen monster.

Features

• Monster search Pick a monster from a searchable list with portrait, star rating, element icon, and archetype.
• Base and bonus stats Enter rune bonus values for HP, ATK, DEF, SPD, Crit Rate, Crit Dmg, RES, and ACC.
• Live totals See each stat’s base value, bonus input, and computed total update as values change.
• Skill damage rows View one row per skill with its description, multiplier formula, damage number, and crit-damage figure.
• Multi-hit labels Show hit counts in the skill row, such as x3.
• Number formatting Display thousands separators and percentage formatting for stat values.
• On-demand monster data Load monster details and nested skills as JSON when needed.
• Formula evaluation Calculate skill damage from text formulas after substituting the current stat totals.

How to use it

1. Open the calculator page.
2. Choose a monster from the searchable list.
3. Enter the rune bonus values for the stats you want to test.
4. Review the updated final stat totals in the table.
5. Check each skill row to see the evaluated damage and crit damage.
6. Adjust the bonus values to compare different builds.

How it works

• Monster data is loaded on demand as JSON, including the monster’s skills.
• Skill multiplier formulas are stored as text and evaluated client-side with a math-expression parser.
• Stat names in the formulas are replaced with computed totals before the expression is simplified.
• The monster list includes display data such as portrait, element, stars, and archetype.
• Stat names are normalized through helper methods and element and archetype values use Rails enums.