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Interactive island · Preact

Mine a Mountain Bomb ROI and Break-Even Calculator

Compute expected gross/net profit, ROI, break-even collection share, and a comparison table across all 8 bombs using your measured collection share and mutation rate.

Mine a Mountain Bomb ROI and Break-Even Calculator

Pick a bomb preset, set your measured collection share and average crystal value, and the lab projects gross, net, ROI, break-even collection share, and a comparison across the full 8-bomb catalog.

Bomb and costBomb presetCrystals spawned per useCollection share (0–100%)Average value per crystal ($)Sell multiplierMutation chance (0–100%)Mutation multiplier (low)Mutation multiplier (high)Detonation Rune active (+40% crystals)Cycle time per use (s)Use count

Expected gross / use

$3,120,000

Cost $15,000,000

Expected net / use

$-11,880,000

ROI -79.2%, profit -712,800,000 $/h

Break-even

100.0% collect

Value > $3,846,154 / crystal

Catalog comparison

Bomb	Rarity	Cost ($)	Gross / use	Net / use	ROI (%)	$ / h
Classic	Common	50,000	3,120,000	3,070,000	6140.0	184,200,000
Wind	Common	400,000	3,120,000	2,720,000	680.0	163,200,000
Ice	Uncommon	2,000,000	3,120,000	1,120,000	56.0	67,200,000
Fire	Uncommon	5,000,000	3,120,000	-1,880,000	-37.6	-112,800,000
Thunder	Rare	15,000,000	3,120,000	-11,880,000	-79.2	-712,800,000
Poison	Epic	40,000,000	3,120,000	-36,880,000	-92.2	-2,212,800,000
Time	Legendary	175,000,000	3,120,000	-171,880,000	-98.2	-10,312,800,000
Agony	Mythic	600,000,000	3,120,000	-596,880,000	-99.5	-35,812,800,000

Warnings

Expected net is negative; this route is a loss under current assumptions before considering mountain rotation cost.

Source: mine-a-mountain_tools-design.md Tool 3 (math), mine-a-mountain_data-collection.md (bomb catalog 2026-07-30). Mutation ranges are datamined community data and update-sensitive; use measured samples after each patch.

The Bomb ROI Lab projects the gross, net, ROI, profit per hour, and break-even thresholds for each of the eight Mine a Mountain bombs under your measured inputs.

Catalog presets (2026-07-30)

Bomb	Rarity	Cost `$`
Classic	Common	50,000
Wind	Common	400,000
Ice	Uncommon	2,000,000
Fire	Uncommon	5,000,000
Thunder	Rare	15,000,000
Poison	Epic	40,000,000
Time	Legendary	175,000,000
Agony	Mythic	600,000,000

Formula

gross_per_use [$]   = N × η × V × E[mutation_factor] × Ms
net_per_use [$]     = gross_per_use − Cb
ROI [%/use]         = 100 × net_per_use / Cb
profit_per_hour [$] = (net_per_use / Tb) × 3600

The mutation factor uses a uniform [a, b] range:

E[mutation_factor] = (1 − pm) × 1 + pm × (a + b) / 2

Documented community ranges (override after updates):

Thunder 1.5×–2.5×, pm = 0.30
Poison 1.5×–2.5×, pm = 0.30
Wet 1.2×–1.8×, pm = 0.30
Radioactive stacks with one base mutation

Break-even thresholds

η* (collection share)  = Cb / (N × V × mutation_factor × Ms)
V* (value per crystal) = Cb / (N × η × mutation_factor × Ms)

If η* > 1, the bomb cannot break even under current assumptions — surfaced as “Unreachable”.

Edge cases

Bag fills mid-blast. Uses your observed collection share η. Does not multiply cash by 1.40 for x2 Crystals automatically.
Zero bomb cost. Free/admin bomb — ROI division skipped.
Mutation stacking. Allows Radioactive + one base mutation only when the user confirms.
Already-mutated inventory. No bomb mutation applied to pre-existing crystals.
Sample mode. When n measured gross sales are entered, returns mean gross, loss probability, and uses-to-cover-progression.

Source

Mine a Mountain Tools Design Spec — Bomb ROI Lab (current revision).