Coal Burn Calculator
How much Coal does every member need stockpiled to survive the Week-4 -70 °C blizzard with the High-Heat Furnace in Overdrive for the full 3-hour window?
Single member
Enter your High-Heat Furnace level and current coal.
- Furnace level
- —
- Burn rate
- — coal / min ± estimate
- Coal needed
- — coal
- You have
- — coal
- Delta
- — coal
Per-level burn rate L2–L29 is not yet KB-verified.
Coal sources (Season 2)
Estimated daily coal yield per source — all 9 KB-verified. Edit any row to match your alliance's actual pace; the 56-day budget chart below updates as you type.
| Source | Est. coal / day | Enabled | KB note |
|---|
Titanium Alloy Factory economy
Factory 1 is available at S2 start. Level 15 on Factory N unlocks Factory N+1 — chain up to 4 free; Factory 5 requires the Weekly Pass. Each factory produces a flat +720 titanium/hr per level (L30 max = 21,600/hr).
| Factory | Unlock trigger | Output at L15 | Coal cost L1→L15 | Notes |
|---|
Recommended factory sequence (first 7 days)
Cascade-to-L15 across 4 free factories costs roughly ~330K coal in factory upgrades alone — before feeding the furnace.
56-day coal budget projection
Starting from your current stockpile, tracks projected daily reserve across the full 8-week season. Adjusts for High-Heat Furnace burn, Alliance Furnace level, and enabled coal sources. If the line crosses zero, that's the day your alliance runs cold — plan replenishment before then.
Model: daily reserve[t] = reserve[t-1] + Σ(enabled sources) − personal_burn − alliance_burn_share − factory_upgrade_avg. Alliance burn share = per-furnace-hourly × hours × 1 (single member's contribution to alliance donations, capped 50/day/member per KB [[06-season-2-frozen]] §120).
Batch (R5 mode)
Paste your alliance roster CSV.