FOE Calculator is a simple tool to help you level Great Buildings using 1.9 (or any custom Arc bonus) threads.
Key Features
1. Select a Great Building
Choose a building from the homepage grid or the dropdown. Each building has its own direct URL, so you can bookmark it if you level it often.
2. Enter the Advancing Level
If your building is level 19 and you're pushing to 20, enter 20. The calculator loads the correct FP requirement and rewards automatically.
3. (Optional) Enter Owner FP Invested
If you’ve already added Forge Points, enter that amount. The lock math updates instantly so you can see what’s safe and what still needs to be covered.
4. Adjust Multipliers
By default, everything is set to 1.9. If your guild runs 1.95 on P1/P2 or some hybrid setup, adjust each position as needed. You will see the rewards column update as you toggle the input up or down.
Auto Lock P1 / P2 Button
In order to not get sniped, it's important to secure P1 and P2 on your GBs before posting to a 1.9 thread. Instead of manually figuring out the safe threshold, just click the Lock P1 / P2 button.
The calculator will automatically:
5. Run Calculation
You’ll see:
Scroll down, click copy, paste into your guild's 1.9 thread.
This calculator makes it easy for you to calculate the cost to lock spots on a Great Building with any combination of multipliers. Many guilds have separate threads that correspond to different Arc bonuses. For example, my guild has a 1.95 thread for P1 and P2 on Arcs, Observatories, and AI Cores. This makes it cheaper for members to level these Great Buildings by reducing their personal investment.
Let's say you're leveling your Arc and you plan to post your first two spots to your guild's 1.95 thread, all you have to do is either click on the up arrow on the calculator's Multiplier field or click into the field and add a 5 after 1.9. The calculator will adjust accordingly for subsequent positions P3, P4, and P5 at the normal 1.9 rate. You would then scroll down to the Thread Post Options, copy the post that includes P1 and P2 only, and paste it into your guild's 1.95 thread.
As long as you click save, you can safely close the application while you wait for your P1 and P2 spots to fill. When you're ready to post P3, P4, and P5 to the 1.9 thread, the thread post for those will be waiting for you when you come back to the app.
Cost to secure position = currentRequiredFP − (2 x reward) + sum of all previous rewards
currentRequiredFP:
The total Forge Points required to level the Great Building.reward:
The cost @ 1.9 (or other multiplier) for the specific position you're aiming to secure.sum of all previous rewards:
The sum of rewards for all higher-ranking (previous) positions.Let's consider an Arc at level 80. The currentRequiredFP is 5464, and we want each position at 1.9.
5464 - (2 x 2613) + 0 = 238
Cost to Secure Position 25464 - (2 x 1311) + 2613 = 229
Cost to Secure Position 35464 - (2 x 437) + 2613 + 1311 = 666
Cost to Secure Position 45464 - (2 x 114) + 2613 + 1311 + 437 = 875
Cost to Secure Position 55464 - (2 x 19) + 2613 + 1311 + 437 + 845 = 951
As demonstrated, the FP needed to secure positions 1 and 2 is not mathematically the same — 238 for position 1 and 229 for position 2.
There is no public API for Great Building data. All data used here is gathered and validated manually. If InnoGames ever provides an official source, I’ll update the app accordingly.
Development updates have been moved here