ONI Rocket Calculator

Estimate ONI rocket range with fuel and mass. Balance oxidizer, tanks, payload, and mission goals. Export results before sending duplicants toward new destinations today.

Calculator

Example Data Table

Mission Engine Oxidizer Dry Mass Payload Fuel Target
Early Scout Steam None 1200 kg 100 kg 500 kg 2500 km
Midgame Cargo Petroleum Oxylite 1800 kg 600 kg 900 kg 12000 km
Long Research Hydrogen Liquid Oxygen 2200 kg 350 kg 900 kg 25000 km

Formula Used

Burnable Fuel = minimum of loaded fuel and oxidizer-supported fuel.

Ideal Range = Burnable Fuel × Engine Efficiency × Oxidizer Coefficient + Booster Bonus.

Wet Mass = Dry Mass + Payload Mass + Loaded Fuel + Loaded Oxidizer.

Mass Penalty = max(Wet Mass, (Wet Mass / 300)3.2).

Actual Range = max(0, Ideal Range − Mass Penalty).

Adjusted Mission Need = Target Range × Mission Legs × (1 + Safety Margin / 100).

This calculator is a planning estimator. Mods, updates, and downloadable content can change rocket behavior.

How To Use This Calculator

Choose the calculation mode first. Use range mode when you know the loaded fuel. Use fuel mode when you know the target distance.

Select the engine and oxidizer. Enter target range, mission legs, safety margin, dry mass, payload, fuel, tanks, and tank capacity.

Press the calculate button. The result appears below the header and above the form. Export the result if you need a record.

Why This Calculator Helps

ONI rockets look simple at first. The launch screen can hide harsh mass penalties. A small payload change may shorten range. Extra oxidizer can also waste room. This calculator gives a clean planning view before construction. It lets you compare fuel, dry mass, payload, tanks, and mission legs in one place.

Planning Better Missions

Good rocket planning starts with the destination. Enter the target distance, then add a safety margin. Use a larger margin for long trips or return plans. Next, enter your rocket mass and payload. The calculator combines these values with loaded fuel and oxidizer. It then estimates whether the rocket can meet the adjusted mission need.

Payload And Tank Choices

Tank count matters because unused capacity does not help. Overloaded fuel can increase mass penalty. Underloaded oxidizer can leave fuel unburned. A balanced design usually gives better range. Petroleum builds are useful for midgame routes. Hydrogen builds offer stronger efficiency when cooling systems are ready. Steam is simple, but range is limited.

Using The Results

The result panel shows burnable fuel, ideal range, mass penalty, adjusted mission need, and status. It also shows suggested fuel when fuel planning mode is selected. Treat the number as a planning estimate. Game updates, mods, and downloadable content can alter behavior. Always confirm with the in-game rocket screen before launch.

Exporting Your Plan

Use the CSV button for spreadsheet records. Use the PDF button for quick sharing. The example table shows common mission profiles. You can copy those values into the form. Compare several designs before building engines, tanks, and cargo modules. This saves materials, duplicant labor, and launch cycles. It also helps keep exploration steady.

Advanced Tips

Do not add payload without checking range again. Keep oxidizer near the needed burn ratio. Add safety margin when the destination has unknown needs. Record successful builds in exports. Over time, your best designs become templates. This makes later space programs faster, cleaner, and easier to manage. Mission logs help too. Save one export after each successful launch. Note the engine, tanks, payload, and target. When a later colony needs the same trip, reuse that record. This reduces guesswork and keeps resource waste low during demanding late game projects.

FAQs

What does this ONI rocket calculator estimate?

It estimates fuel use, oxidizer balance, wet mass, mass penalty, and possible range. It helps plan launch builds before spending materials.

Can I calculate fuel for a target route?

Yes. Choose the fuel planning mode. Enter the target distance, mass, tanks, and safety margin. The calculator suggests fuel and oxidizer.

Why does payload reduce rocket range?

Payload increases wet mass. Higher wet mass raises the penalty. The penalty can reduce final range even when fuel remains available.

Should fuel and oxidizer be equal?

For petroleum and hydrogen planning, this calculator uses a one-to-one burn ratio. Steam mode ignores oxidizer because it uses fuel alone.

What does liquid oxygen change?

Liquid oxygen uses a higher coefficient. This increases ideal range for the same burnable fuel amount, before mass penalty is applied.

Why add a safety margin?

A safety margin covers planning mistakes, cargo changes, and route uncertainty. Long trips usually need a larger margin than short scout flights.

Can this replace the in-game rocket panel?

No. Use it as a planning aid. Always verify final rocket range and requirements in the game before launching a colony mission.

What export options are included?

The calculator includes CSV and PDF export buttons. Use CSV for spreadsheets. Use PDF for quick reports and build notes.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.