Advanced Reactor Inputs
Formula Used
Heat per tick = Burn rate × Heat per mB fuel.
Effective coolant capacity = Coolant heat capacity × Coolant efficiency.
Coolant needed = Heat per tick ÷ Effective coolant capacity.
Steam output = Coolant used × Steam ratio.
Power estimate = Steam output × Turbine FE per steam.
Fuel per hour = Burn rate × 20 × 3600.
Safe burn rate = Coolant supply × usable safety percent × effective coolant capacity ÷ heat per mB fuel.
How to Use This Calculator
Enter the burn rate you want to test. Add your available fuel amount. Then enter coolant flow, heat capacity, and coolant efficiency.
Use the steam ratio and turbine value to estimate energy output. Adjust the waste ratio if your pack changes by configuration.
Set a safety margin to keep unused coolant capacity. A higher margin gives safer operation, but it lowers the suggested burn rate.
Press calculate. The result appears above the form and below the page header. Use the export buttons to save the result.
Example Data Table
| Build Type | Burn Rate | Coolant Supply | Heat Per mB | Expected Result |
|---|---|---|---|---|
| Starter Test | 0.05 mB/t | 1500 mB/t | 1000000 | Low fuel use and safer load |
| Balanced Setup | 0.10 mB/t | 2500 mB/t | 1000000 | Good output with margin |
| High Output | 0.20 mB/t | 3500 mB/t | 1000000 | Needs strong coolant delivery |
About Mekanism Fission Reactor Planning
Why Reactor Numbers Matter
A Mekanism fission reactor can turn fuel into strong production chains. It can also fail when heat grows faster than coolant removal. Good planning reduces that risk. This calculator gives a structured way to test burn rates before changing a live build. It focuses on heat, coolant, steam, power, fuel time, and waste. These values help you compare designs with less guessing.
Burn Rate and Heat
The burn rate controls how fast fuel is consumed each tick. A higher value creates more heat. More heat needs more coolant. If coolant delivery is weak, stored heat can rise quickly. The calculator multiplies burn rate by heat per fuel unit. This gives the expected heat per tick. You can adjust the heat value for different modpack settings.
Coolant and Steam Output
Coolant is the main safety control. Water, sodium, or custom pack systems may behave differently. This tool uses an adjustable heat capacity and efficiency field. That makes it useful for many server rules. The coolant needed result shows the minimum flow for the selected burn rate. The coolant load percentage shows how hard your system is working. Keep extra margin for lag, chunk issues, and pipe limits.
Fuel, Waste, and Runtime
Fuel use can become expensive in long sessions. The fuel per hour result shows the real cost of a chosen burn rate. Runtime uses the stored fuel amount and tick rate. Waste per hour helps plan storage, processing, or disposal. These outputs are useful when scaling toward polonium, antimatter, or other late game goals.
Safe Tuning Method
Start with a small burn rate. Check coolant load. Increase slowly while keeping a clear margin. Watch stored heat during real operation. Compare the safe burn rate with your target. If the target is higher, improve coolant supply first. This calculator is a planning aid, not a replacement for in game testing. Always build safety controls, backups, and automatic shutoff logic.
FAQs
What does this calculator estimate?
It estimates reactor heat, coolant demand, steam output, power, fuel use, waste, runtime, and safe burn rate from your chosen inputs.
Is this calculator exact for every modpack?
No. Many packs change balance values. Use the editable heat, coolant, turbine, and waste fields to match your server settings.
Why is coolant load important?
Coolant load shows how much of your coolant supply is required. A value near or above 100% means the setup needs attention.
What is a safe burn rate?
It is the burn rate estimated from your coolant supply after reserving your selected safety margin.
Why does runtime use ticks?
Minecraft normally runs at 20 ticks per second. The calculator uses that rate to estimate fuel used over real time.
Can I model sodium cooling?
Yes. Enter a custom coolant heat capacity and efficiency value that matches your sodium system or modpack configuration.
Why is my result marked unsafe?
The selected burn rate needs more coolant than you provide. Lower the burn rate or increase coolant delivery.
Can I save my calculation?
Yes. After calculating, use the CSV or PDF button to export the result for build notes or later comparison.