Foe GB Calculator

An advanced tool for Forge of Empires Great Building investment planning.

Great Building 1.9 Investment Calculator

Owner’s Final Cost

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This is the total Forge Points you need to add to finish the level after all 1.9 spots are taken.

FP Contribution Breakdown

Visual breakdown of Forge Point contributions from the owner and investors.

Deep Dive into the Foe GB Calculator

What is a Foe GB Calculator?

A foe gb calculator (Forge of Empires Great Building Calculator) is a vital tool for players engaged in leveling their Great Buildings (GBs). Leveling a GB requires a significant amount of Forge Points (FPs). The calculator’s primary purpose is to determine the most efficient way to distribute these costs between the GB owner and other players who contribute in exchange for rewards (blueprints, medals, and FPs). This is most commonly done in what is called a “1.9 thread,” where investors contribute 1.9 times the base FP reward for a spot.

This tool helps you figure out the exact number of FPs you, the owner, need to contribute after accounting for these investor spots. Using a reliable foe gb calculator prevents over-donation and ensures reward spots are properly secured against “snipers”—players who might try to steal a reward spot by donating just enough FPs at the last moment.

The Foe GB Calculator Formula and Explanation

The core logic of a foe gb calculator revolves around the “1.9 investment” principle. The term “1.9” comes from the 90% bonus to rewards that a level 80 Arc GB provides. Investors with this bonus can pay 1.9 times the base reward for a spot and get their FPs back, making it a break-even transaction for them.

The main formulas are:

1. Investor Secure Cost = ceil(Reward * (1 + Arc Bonus))
2. Total Investor Contribution = Sum of all Investor Secure Costs
3. Owner’s Final Cost = Total FP Cost – Total Investor Contribution – Current FPs

A crucial secondary calculation is the “lock” amount. To “lock” a spot, the owner must ensure that after their contribution, the remaining FPs needed are less than double the investor’s contribution. This prevents a sniper from being able to profit. For more info, see this guide on understanding the Arc bonus.

Practical Examples

Example 1: Leveling an Observatory

Let’s say you are leveling an Observatory from 9 to 10. The total cost is 410 FP. The rewards are P1=60, P2=20, P3=5, P4=0, P5=0. Using a standard 1.9 thread (90% bonus):

• P1 Secure Cost: ceil(60 * 1.9) = 114 FP
• P2 Secure Cost: ceil(20 * 1.9) = 38 FP
• P3 Secure Cost: ceil(5 * 1.9) = 10 FP
• Total from investors: 114 + 38 + 10 = 162 FP
• Owner’s Final Cost: 410 – 162 = 248 FP

Example 2: High-Level Arc with Negative Owner Cost

Imagine leveling an Arc from 79 to 80. The total cost is 1,726 FP. The rewards are P1=295, P2=100, P3=35, P4=10, P5=5. With a 90% bonus from investors:

• P1 Secure Cost: ceil(295 * 1.9) = 561 FP
• P2 Secure Cost: ceil(100 * 1.9) = 190 FP
• P3 Secure Cost: ceil(35 * 1.9) = 67 FP
• P4 Secure Cost: ceil(10 * 1.9) = 19 FP
• P5 Secure Cost: ceil(5 * 1.9) = 10 FP
• Total from investors: 561 + 190 + 67 + 19 + 10 = 847 FP
• The owner must “pre-fill” the GB with enough FPs to secure all spots. The calculator determines this is 879 FP. This is the owner’s true cost. The remaining FPs (1726 – 879 – 847 = 0) are perfectly covered. The owner’s cost is not negative, but the amount they must secure the spots with. Our city planner tool can help you manage these FP costs.

How to Use This Foe GB Calculator

Using our calculator is straightforward:

1. Enter Total FP Cost: Find the total FP requirement for the level you are working on and enter it.
2. Input Current FPs: Add any Forge Points already on the building, whether from you or someone else.
3. Fill in Rewards: Enter the base FP rewards for positions 1 through 5.
4. Set Arc Bonus: The default is 90% for a 1.9 thread, but you can adjust it for 1.8, 1.85, etc. threads.
5. Review Results: The calculator instantly shows the final “Owner’s Cost” you need to pay, along with how many FPs you must add to “lock” each spot for investors. The chart provides a quick visual summary.

Key Factors That Affect Foe GB Calculations

• GB and Level: The single biggest factor. Each Great Building has a unique cost and reward table for each level.
• Investor’s Arc Bonus: While 1.9 (90%) is standard, some groups use lower rates. This directly changes the amount investors pay and, consequently, the owner’s share.
• Snipers: The presence of players who don’t follow the 1.9 rule can disrupt leveling. The “FP to Lock” feature is designed to combat this.
• Owner’s Own Arc: While this calculator focuses on investor contributions, a high-level Arc for the owner means they earn more FPs from investing in others, which they can then use on their own GBs. For tips on earning more FPs, see our guide on how to get forge points.
• Guild vs. Public Threads: Guild threads are generally more secure. Public threads carry a higher risk of sniping, making lock calculations more critical.
• Partial Contributions: If someone has already added a small, random number of FPs, you must include this in the “Current FPs” field for an accurate calculation.

Frequently Asked Questions (FAQ)

Q: What is a “1.9 thread”?
A: It’s a group of players, usually in a guild, who agree to contribute to each other’s Great Buildings. They pay 1.9 times the reward value, which is a break-even cost if their own Arc building is at level 80 (providing a 90% bonus).

Q: What does it mean to “snipe” a spot?
A: Sniping is when a player outside the 1.9 system adds just enough FPs to take a reward spot from an intended investor, often for a profit. A good foe gb calculator helps owners prevent this.

Q: Why is the owner’s cost sometimes negative?
A: A negative owner cost means the total contributions from 1.9 investors will exceed the total cost of the level. This happens on some high-level GBs with very high rewards. The owner profits in FPs.

Q: What does “FP to Lock” mean?
A: It’s the minimum number of FPs the owner must have on the building to make it unprofitable for a sniper to take a specific spot. Our calculator shows how many FPs you need to add to reach this lock amount. Check our advanced FoE tips for more on this strategy.

Q: Do I have to use a 1.9 thread?
No, you can also use 1.8 or 1.85 threads if that’s what your guild uses. Simply change the “Investor Arc Bonus” percentage in the calculator (e.g., 85% for a 1.85 thread).

Q: Which Great Building should I level first?
A: Most players recommend leveling The Arc to 80 first, as its bonus is essential for efficient leveling of all other GBs. After that, focus on GBs that support your playstyle (attack, goods, FPs). Our Great Building list can help you decide.

Q: How is the ‘secure cost’ calculated?
A: It’s the reward for the spot multiplied by (1 + Arc Bonus percentage). For a 90% bonus, it’s Reward * 1.9. The result is always rounded up (ceiling) to the nearest whole number.

Q: Can I use this calculator for any Great Building?
Yes. Since you manually enter the total cost and reward values, this foe gb calculator is universal and works for every GB at any level in Forge of Empires.

Related Tools and Internal Resources

Here are some other resources you might find helpful on your Forge of Empires journey:

• Understanding The Arc: A deep dive into the most important GB in the game.
• FoE City Planner: Plan your city layout for maximum efficiency.
• Leveling Great Buildings Fast: Strategies to accelerate your GB progress.
• Complete Great Building List: A reference for all GBs, their costs, and their bonuses.
• How to Get More Forge Points: Tips and tricks for increasing your daily FP income.
• Advanced FoE Player Tips: Go beyond the basics with these expert strategies.