Arc 1.9 Calculator

This calculator helps Forge of Empires players determine the required Forge Point (FP) contributions for leveling Great Buildings using the popular ‘1.9’ investment method. Enter your GB’s details to calculate the owner’s share and secure investor spots.

What is an Arc 1.9 Calculator?

An arc 1.9 calculator is an essential tool for players of the popular strategy game Forge of Empires (FoE). It is specifically designed to facilitate the “1.9 Thread” or “1.9 Method,” a collaborative strategy for leveling up Great Buildings (GBs) efficiently. The ‘1.9’ refers to the 190% return on investment (1.9 times the base reward) that players with a Level 80 Arc Great Building offer to investors who contribute Forge Points (FPs) to their GBs. This method creates a powerful, mutually beneficial system for rapid GB advancement.

This type of calculator should be used by any FoE player who owns a Great Building and wants to level it up quickly and cost-effectively. It is invaluable for the GB owner, who needs to know exactly how many of their own FPs to add to “secure” the reward spots for investors. It is also useful for investors to verify the costs. Common misconceptions are that this system is only for high-level players or that it’s too complex. In reality, a good arc 1.9 calculator makes the process simple for everyone, ensuring no FPs are wasted and preventing other players from “sniping” reward spots.

Arc 1.9 Calculator Formula and Mathematical Explanation

The core principle of the arc 1.9 calculator is to determine the owner’s minimum contribution needed to make all investor spots “secure.” A spot is secure when another player cannot contribute FPs and overtake the intended investor for a lower cost. The calculation involves several steps:

1. Calculate Investor Cost: For each reward position (P1 to P5), the cost for an investor is calculated. `Investor Cost = Base Reward * 1.9`.
2. Calculate Total Investor Contribution: All individual investor costs are summed up to find the total FPs that will be provided by others. `Total Investor FPs = Σ(Investor Costs)`.
3. Calculate FPs Needed to Level: This is the total FPs for the level minus any FPs already on the building. `FPs Needed = Total Level Cost – Current FPs`.
4. Calculate Owner’s Contribution: The final and most important calculation is the owner’s share. This is the difference between the FPs still needed and the total amount the investors will cover. `Owner’s Contribution = FPs Needed – Total Investor FPs`.

If the Owner’s Contribution is a negative number, it means the 1.9 payments from investors more than cover the remaining cost, so the owner’s share is 0. A reliable arc 1.9 calculator performs these steps instantly. For more in-depth strategies, check out our FoE leveling guide.

Variable	Meaning	Unit	Typical Range
Total FPs for Level	Total Forge Points required to finish the GB level.	FP	100 – 10,000+
Current FPs	Forge Points already placed on the GB.	FP	0 – Total FPs
Px Reward	The base FP reward for finishing in position ‘x’ (1-5).	FP	5 – 2,000+
Owner’s Contribution	The amount the GB owner must add to secure the spots.	FP	0 – Total FPs

Practical Examples (Real-World Use Cases)

Example 1: Leveling a Mid-Level Castle del Monte

A player wants to level their Castle del Monte (CdM) from 25 to 26. The total cost is 1,202 FP. The rewards are: P1=415, P2=210, P3=70, P4=25, P5=10. The player has already added 100 FP.

• Inputs: Total FPs=1202, Current FPs=100, P1=415, P2=210, P3=70, P4=25, P5=10.
• Investor Costs (1.9x): P1=789, P2=399, P3=133, P4=48, P5=19. Total = 1388 FP.
• Calculation: FPs still needed = 1202 – 100 = 1102 FP.
• Output: Owner’s Contribution = 1102 – 1388 = -286. The result is negative, so the owner contributes 0 FP. The investors’ payments more than cover the cost. The owner simply lists the spots and lets investors fill them. This scenario shows the power of an arc 1.9 calculator in saving the owner’s resources.

Example 2: Securing a High-Level Arc

A player is leveling their own Arc from 79 to 80. The cost is 3,215 FP. The rewards are P1=1495, P2=750, P3=250, P4=80, P5=25. There are no FPs on it yet.

• Inputs: Total FPs=3215, Current FPs=0, P1=1495, P2=750, P3=250, P4=80, P5=25.
• Investor Costs (1.9x): P1=2841, P2=1425, P3=475, P4=152, P5=48. Total = 4941 FP.
• Calculation: FPs still needed = 3215 – 0 = 3215 FP.
• Output: Owner’s Contribution = 3215 – 4941 = -1726. Again, the owner’s share is 0 FP. However, the owner must still add enough FPs to “lock” the spots. The arc 1.9 calculator also shows the FPs needed to secure each spot, a crucial piece of information. For instance, to secure P1, the owner must ensure `3215 – 2841 = 374` FPs are on the building before the P1 investor adds their share. This is a key aspect of learning how to secure a spot great building.

How to Use This Arc 1.9 Calculator

Using this arc 1.9 calculator is a straightforward process designed to give you accurate results quickly.

1. Enter Total FPs: In the “Total FPs for Next Level” field, enter the full Forge Point cost for the Great Building’s next level. You can find this information in the game.
2. Enter Current FPs: Input the amount of Forge Points already contributed to the building under “Current FPs on Building”. If none, enter 0.
3. Enter Rewards: Fill in the base FP rewards for each of the five positions (P1 through P5). Be sure to use the base reward, not a pre-calculated 1.9 value.
4. Read the Results: The calculator automatically updates. The primary result shows the “Owner’s Contribution”—the exact amount of FPs you need to add to secure all five spots for your investors.
5. Analyze the Breakdown: Review the intermediate values and the detailed table. The table shows the 1.9 cost for each investor and, crucially, the “FPs to Secure Spot,” which tells you the threshold at which a spot becomes locked from snipers.
6. Make Decisions: Use this data to add your FPs, then post the required amounts for P1-P5 in your guild’s 1.9 thread. Our forge point calculator can help with broader planning.

Key Factors That Affect Arc 1.9 Calculator Results

The output of an arc 1.9 calculator is sensitive to several key variables. Understanding them is crucial for effective Great Building management.

• Total Level Cost: The primary driver. Higher level costs will naturally require a larger total contribution, which can sometimes mean a larger owner’s share if the rewards don’t scale proportionally.
• Reward Values (P1-P5): The size of the base rewards is critical. GBs with high rewards, like the Arc or Observatory, are much cheaper to level via the 1.9 method because the investor contributions are massive.
• Current FP Contribution: The more FPs already on a building (from you or others), the lower the remaining need, directly reducing the final calculation for the owner’s share.
• Investor’s Arc Level: The entire system is predicated on investors having a Level 80 Arc to get a 90% bonus (total 1.9 return). If your group uses a different rate (e.g., 1.85 or 1.92), the calculator’s rate must be adjusted for an accurate result. Our calculator is hard-coded for 1.9.
• Snipers: The presence of players outside the 1.9 group who might try to take a reward spot for a lower price. This is why understanding the “FPs to Secure Spot” value from the arc 1.9 calculator is so vital. Properly securing spots makes sniping impossible. To better understand this, see our article on FoE return on investment.
• Timing and Coordination: The calculations are only valid if the spots are posted and taken in an organized manner. A miscommunication can lead to overpayment or a spot being sniped before it’s properly secured. Using a dedicated Forge of Empires great building investment tool is key.

Frequently Asked Questions (FAQ)

1. What does it mean to “secure” or “lock” a spot?

Securing a spot means adding enough Forge Points to a Great Building so that the remaining FPs required to level it are less than what an investor will pay (Reward x 1.9). This prevents a “sniper” from adding a smaller amount to steal the position. Our arc 1.9 calculator shows you exactly how many owner FPs are needed to do this for all spots.

2. What if the calculator shows a negative number for the owner’s contribution?

This is a great outcome! It means the total payments from investors at the 1.9 rate exceed the remaining cost to level the building. Your contribution is effectively 0 FPs. You still need to manage the process, but you won’t spend your own FPs on that level.

3. Why do people use 1.9 and not another number?

The 1.9 standard comes from the bonus provided by a Level 80 Arc Great Building, which gives a 90% bonus on GB rewards. This means the investor gets back 100% of their investment plus a 90% bonus, for a total of 190% or 1.9 times the original reward. It has become the community standard for efficient leveling.

4. Can I use this calculator for a 1.85 or 1.92 thread?

This specific arc 1.9 calculator is hard-coded for the 1.9 rate. For other rates, you would need a calculator with a customizable rate input. The underlying mathematical principle, however, remains the same.

5. Does the calculator account for Blueprints and Medals?

No, this tool is strictly a forge point calculator. It focuses solely on the FP math for leveling. The blueprints and medals are additional rewards that make participating as an investor worthwhile, but they are not part of the FP cost calculation.

6. What happens if someone snipes a spot?

If a spot is not properly secured and a sniper takes it, the original investor loses their spot, and the owner may be short the FPs they were expecting. This disrupts the entire process, which is why using an arc 1.9 calculator to secure spots correctly is so critical.

7. Is it better to self-level or use the 1.9 method?

For almost every Great Building, using the 1.9 method is vastly cheaper and faster than self-leveling. The amount of FPs an owner saves is enormous, especially on high-level GBs. The only cost is the time to coordinate with investors.

8. What if I enter the wrong reward values?

The calculator’s output is only as accurate as your input. Entering incorrect reward values will lead to an incorrect owner’s contribution, potentially causing you to over- or under-invest and fail to secure the spots. Always double-check the reward values in-game.