Summoners War Bomb Damage Calculator

Calculator

Attack input mode

Shown total attack

Base attack

Rune attack percent

Flat attack

Leader attack percent

Tower or building attack percent

Extra attack percent

Fight set count

Bomb skill multiplier percent

Skillup damage percent

Attack status

Custom attack status percent

Artifact bomb damage percent

Artifact damage dealt percent

Other damage taken increase percent

Other damage bonus percent

Target damage reduction percent

Shield amount

Flat reduction

Bomb count

Target HP

Target has Brand

Apply ignore-defense engine factor

Formula Used

Derived Attack = Base Attack + Base Attack × Total Attack Percent ÷ 100 + Flat Attack.

Combat Attack = Starting Attack × (1 + Attack Status Percent ÷ 100).

Base Bomb Damage = Combat Attack × Bomb Skill Multiplier ÷ 100.

Final Damage = Base Bomb Damage × Positive Modifiers × Engine Factor × Reduction Factor − Shield − Flat Reduction.

Positive modifiers include skillups, Brand, artifact bomb damage, artifact damage dealt, damage taken increase, and other damage bonuses.

How to Use This Calculator

Choose whether to enter shown attack or derive attack from stat parts.
Enter the bomb skill multiplier from your skill reference or test data.
Add attack buff, Brand, artifacts, shields, and reductions.
Set the bomb count and target HP.
Press calculate, then review the result above the form.
Use CSV or PDF export for build comparisons.

Example Data Table

Case	Attack	Multiplier	Attack Status	Brand	Bombs	Estimated Use
Arena bomber	2,500	540%	Buff	No	1	Quick single target check
Siege setup	2,900	650%	Buff	Yes	2	High pressure kill plan
Unsafe setup	2,200	540%	Attack break	No	1	Failure risk review

Understanding Bomb Damage

Bomb damage in Summoners War is a focused math problem. The effect does not use critical rate or critical damage. It mainly follows the bomber attack value, the selected bomb multiplier, and active damage modifiers. This calculator keeps those parts visible. You can test a shown attack value, or derive attack from base stats, rune percent, flat attack, leader skill, tower bonus, and Fight sets.

Why Attack Matters

Bomb teams win by removing targets before they move again. A small attack gain can create a large change when the multiplier is high. Attack buff is also important because it raises the combat attack used by the bomb. Attack break can cut the same value and make a safe plan fail. That is why the form includes both common status options and a custom value.

Useful Damage Modifiers

Branding increases damage taken. Artifact lines can add bomb damage or general damage dealt. Some targets may have passives, reduction effects, shields, or flat mitigation. These items do not change the displayed attack, but they can change the final number. Enter them separately to keep the result traceable.

Planning With Results

The result panel shows derived attack, combat attack, raw bomb damage, final damage per bomb, and total damage for repeated bombs. It also compares total damage with target health. This helps you decide whether one bomber is enough, whether a second bomb is needed, or whether extra setup is required.

Practical Team Use

Use realistic values from the mode you plan to play. Arena, siege, and guild fights can differ because towers, leader skills, and team sets may change. If you are not sure about a passive, enter a reduction estimate and compare several cases. The CSV export is useful for recording builds. The PDF export gives a compact note for a team plan. Treat every output as an estimate, because live battles may include hidden passives, shields, artifacts, and balance changes. Recheck key targets after patches or rune upgrades. Good bomb math reduces guesswork and helps you choose safer attacks. Save common presets as rows in the example table. Then adjust one input at a time. This makes build comparisons easier and avoids confusing stacked bonuses safely today.

FAQs

Does bomb damage use critical damage?

No. Bomb damage is normally calculated from attack and bomb modifiers. Critical rate and critical damage are not useful inputs for this calculator.

Why is attack buff included?

Attack buff raises the combat attack value used for the bomb. This can greatly increase final damage when the skill multiplier is high.

What does Brand do here?

Brand is treated as a damage taken increase. The calculator applies it as a positive modifier when the checkbox is selected.

Should I use shown attack or derived attack?

Use shown attack when you already know the monster stat. Use derived attack when planning runes, towers, leaders, and Fight sets.

What is the skill multiplier field?

It is the bomb skill percentage. For example, enter 540 for a 540% attack multiplier. You can change it for different bombers.

Why include shields and reductions?

Some targets may survive through shields, passives, artifacts, or damage reduction. These fields help create safer estimates before a battle.

Is the result always exact?

No. Treat it as a planning estimate. Game updates, hidden passives, artifact effects, and special conditions can change live battle results.

Can I compare multiple builds?

Yes. Calculate each build, download the CSV, and compare attack values, modifiers, final damage, and lethal thresholds side by side.