Forge of Empires GB Calculator
Calculate your exact Forge Point cost for leveling any Great Building.
The total number of Forge Points needed for the GB to reach the next level.
Forge Points already contributed to this level.
The reward bonus from the investor’s Arc. 90% is standard for ‘1.9’ groups.
Reward Spot Forge Points
What is a Forge of Empires GB Calculator?
A Forge of Empires GB calculator is a vital tool for any player looking to efficiently level up their Great Buildings (GBs). It calculates the exact number of Forge Points (FPs) a GB owner needs to contribute to a level after accounting for contributions from other players, typically those using a high-level Arc to gain a bonus. This process is often called the “1.9 method” or a similar name based on the Arc bonus percentage.
Without this calculator, a player risks overpaying significantly to level their own buildings. By using investors to fill the top reward spots, the owner’s total cost can be drastically reduced, sometimes even resulting in a net profit of Forge Points. This tool is essential for anyone participating in guild contribution threads or private investment groups. You can learn more about game strategy at a fan-run community wiki.
The Forge of Empires GB Formula and Explanation
The core logic of the calculator is to determine the owner’s remaining cost after subtracting all investor contributions from the total FPs required. The formula for the primary calculation is:
Owner’s Cost = Total FPs – Current FPs – Σ (RewardN × (1 + Investor Arc Bonus %))
Where Σ (Sigma) represents the sum of the costs for all investor spots (P1 through P5). The investor’s cost for each spot is their reward multiplied by their Arc bonus factor.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Total FPs | Total Forge Points required for the GB’s next level. | Forge Points (unitless) | 100 – 50,000+ |
| Current FPs | Forge Points already on the building. | Forge Points (unitless) | 0 – Total FPs |
| Investor Arc Bonus % | The reward bonus percentage of the investors. | Percentage (%) | 85 – 92+ |
| RewardN | The base Forge Point reward for taking position N (1-5). | Forge Points (unitless) | 0 – 5,000+ |
Practical Examples
Example 1: Leveling a Mid-Level Zeus
Let’s say you’re leveling your Statue of Zeus from 10 to 11.
- Inputs:
- Total FPs for Level: 460
- Current FPs on GB: 0
- Investor’s Arc Bonus: 90% (the “1.9 method”)
- P1 Reward: 60, P2: 30, P3: 15, P4: 5, P5: 2
- Investor Costs:
- P1 Cost: 60 * 1.9 = 114 FPs
- P2 Cost: 30 * 1.9 = 57 FPs
- P3 Cost: 15 * 1.9 = 29 FPs (rounded up)
- P4 Cost: 5 * 1.9 = 10 FPs (rounded up)
- P5 Cost: 2 * 1.9 = 4 FPs (rounded up)
- Result:
- Total from Investors: 114 + 57 + 29 + 10 + 4 = 214 FPs
- Owner’s Final Cost: 460 – 214 = 246 FPs
Example 2: Leveling a High-Level Arc
Now for a bigger project: leveling your own Arc from 79 to 80.
- Inputs:
- Total FPs for Level: 7,909
- Current FPs on GB: 0
- Investor’s Arc Bonus: 90% (1.9)
- P1 Reward: 900, P2: 450, P3: 225, P4: 113, P5: 38
- Investor Costs:
- P1 Cost: 900 * 1.9 = 1710 FPs
- P2 Cost: 450 * 1.9 = 855 FPs
- P3 Cost: 225 * 1.9 = 428 FPs (rounded up)
- P4 Cost: 113 * 1.9 = 215 FPs (rounded up)
- P5 Cost: 38 * 1.9 = 73 FPs (rounded up)
- Result:
- Total from Investors: 1710 + 855 + 428 + 215 + 73 = 3281 FPs
- Owner’s Final Cost: 7909 – 3281 = 4628 FPs
How to Use This Forge of Empires GB Calculator
Using this calculator is simple. Follow these steps to find your cost:
- Enter Total FPs for Level: Find the total Forge Points required for the level you are working on and enter it. You can find this info on the FoE Wiki.
- Enter Current FPs: Input any Forge Points that have already been placed on the building. Usually, this will be 0.
- Set Investor’s Arc Bonus: Enter the bonus percentage your investors have. For standard “1.9 threads,” this is 90%. If your group uses a 1.85 rate, enter 85.
- Input Reward FPs: Fill in the base FP rewards for each of the five contributor spots for that specific GB level.
- Click “Calculate Cost”: The tool will instantly compute the results.
- Interpret the Results: The primary result shows your final cost. The table below breaks down what each investor pays and how much of the “cost” for each reward spot is covered by their contribution. The chart provides a visual share of who pays what.
Key Factors That Affect GB Leveling Costs
Several factors can change the outcome of a Forge of Empires GB calculator. Understanding them is key to mastering the game’s economy.
- Investor’s Arc Bonus: This is the most critical factor. A higher bonus (e.g., 91% vs 90%) means the investor pays more for the same reward, directly reducing the owner’s cost.
- GB Level: As a Great Building’s level increases, the total FP cost skyrockets. However, the rewards for the top spots also increase, making investor contributions more powerful.
- The Specific Great Building: Different GBs have different costs and rewards per level. Buildings like The Arc and Castel del Monte have very high rewards, making them prime candidates for this method.
- Availability of Investors: You must have a reliable group of players who can afford to take the reward spots. Without them, the owner is stuck paying the full amount.
- Sniping: This is the act of an outside player contributing just enough to steal a reward spot from an intended investor. Properly securing spots is crucial. Our calculator helps by showing how many FPs are needed to lock a spot.
- Self-Contribution: If an owner has a high-level Arc, they might choose to “self-snipe” a lower spot (like P4 or P5) to further reduce their net cost, as they get the reward back plus their own Arc bonus.
Frequently Asked Questions (FAQ)
What is the “1.9 method” in Forge of Empires?
The “1.9 method” is a common term for when an investor with a 90% Arc bonus contributes to a Great Building. They pay 1.9 times the reward value in Forge Points (100% of the reward + 90% bonus = 190% or 1.9x). This is the most common and efficient way to level GBs.
Why is my calculated Owner’s Cost negative?
A negative cost is a good thing! It means you are in profit. This happens on certain GB levels where the total contributions from investors are greater than the total FPs needed to level the building. You will receive more Forge Points back from your investors than you need to put in.
What does it mean to “secure” a GB spot?
Securing a spot means the owner adds enough Forge Points so that it’s impossible for an outside player to profitably “snipe” (steal) the spot from the intended investor. This calculator focuses on the final cost, which is the result after all spots are secured and taken.
Can I use this forge of empires gb calculator for any building?
Yes. This calculator is universal. As long as you input the correct Total FPs, Current FPs, and Reward values for any Great Building at any level, the calculation will be accurate.
What happens if I can’t find an investor for a spot?
If a spot (e.g., P5) remains empty, the owner is responsible for covering that contribution. In our tool’s calculation, you would simply set the reward for that spot to 0 to see what your new, higher cost would be.
How do I find the correct FP costs and rewards for a GB level?
The most reliable source is the fan-managed Forge of Empires Wiki. They have detailed charts for every Great Building listing the costs, rewards, and other data for every single level.
Does the Arc bonus apply to medals or blueprints?
No. The Arc’s bonus only applies to the Forge Point rewards from contributing to Great Buildings. It does not increase the number of medals or blueprints received.
Is a higher investor Arc bonus always better?
For the GB owner, yes, absolutely. A higher bonus on the investor’s side means they contribute more FPs for the same reward, which directly reduces the owner’s share of the cost.
Related Tools and Internal Resources
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- Cultural Settlement Planner – Efficiently complete Egyptian or Viking settlements.
- Advanced Player Tips & Tricks – Read our collection of expert strategies.
- Guide to Advancing Eras – A strategic look at moving through the ages.