Oxygen Not Included Calculators

Geyser Calculator

Analyze any geyser, vent, volcano or fissure — average output, taming, dormancy storage, cooling, oxygen, and power. Enter what your geyser's analysis panel shows, or dial in the five random rolls.

Steam Vent
Steam Vent
Steam · 500 °C
From your analysis panel
Geotuning
Output temp after boost: 500 °C (from 500 °C)
750 g/s
average output
450
kg / cycle
51%
better than

Output

Steam Steam 750 g/s↗ 450 kg/cycle
Output temperature500 °C
Max pressure5 kg
This type ranges333 g/s – 1333 g/s
Highest active output1667 g/s

Dormancy & storage

Active period75.0 / 125.0 cycles
Dormancy50.0 cycles
Storage to bridge dormancy22500 kg
Liquid Reservoirs (5000 kg)4.5
Longest possible dormancy135 cycles

Cooling

Average heat1473097 DTU/s
≈ Steam Turbines to cool average1.87
Active-season heat2455162 DTU/s

Oxygen

Oxygen Oxygen 666 g/s 400 kg/cycle
Duplicants supported6

Via an Electrolyzer (100 g/s O₂ per dupe).

Geothermal (steam turbines)

Steam temperature500 °C
Steam Turbines0.37
Gross output319 W
Aquatuner overhead0.22 × 1200 W
Net power55 W
Nerd numbers — the five random rolls

Each geyser rolls five 0–1 values that scale its stats between the type's min and max. Edit a roll to see the observed values above update, or edit the observed values to back-solve the rolls.

Output rate 750 kg/cycle
Eruption period 600 s
Active fraction 50.0%
Year length 125 cy
Active-of-year 60%

Analyze any Oxygen Not Included geyser

The geyser calculator turns your geyser's analysis panel into everything you need to tame it: average output in kg/s and kg/cycle, the five random rolls that set its stats, dormancy storage in reservoirs, the cooling load in steam-turbine equivalents, oxygen and duplicants supported, and generator power for Natural Gas and Hydrogen vents. Add Geotuner boosts to see the +20%-per-boost output, the element cost, and any phase change when the hotter output boils.

Every number comes straight from the live game — the same Resample curve the game uses to roll a geyser — so the results match what you see in-game and stay current with each update including the Aquatic Planet Pack. Feed a geyser's output into the farm, food and ranch calculators to plan the rest of your colony.

Geyser calculator FAQ

How is a geyser's average output calculated in Oxygen Not Included?
Average output = emission while erupting × active fraction (eruption on-time ÷ period) × active-of-year (active cycles ÷ total cycles). The calculator derives all of this from the values on your geyser's in-game analysis panel, or from the five 0–1 rolls the game assigns, and shows it in kg/s and kg/cycle.
What does geotuning do to a geyser?
Each Geotuner adds +20% to output (up to +100% with 5) and raises the output temperature by a per-type amount, while consuming an element (Bleach Stone, Salt, Polluted Dirt, Abyssalite or Refined Phosphorus). The calculator shows the boosted output, the geotuner input cost per cycle, and warns when the hotter output boils into a new element.
How much storage do I need for a geyser's dormancy?
During dormancy the geyser produces nothing, so you buffer the active-period surplus. The calculator multiplies dormant cycles by the average output to get the kilograms to store, then converts that to Liquid Reservoirs (5000 kg) or Gas Reservoirs (1000 kg).