FoE 1.9 Calculator for Great Buildings

The ultimate tool for calculating Forge Points (FPs) for the 1.9 thread investment system.

Reward Spot Details (Base Reward)

1.9 Secure Contribution Breakdown

Position	1.9 Investor Cost (FP)	Owner FP to Secure (Cumulative)	Is Spot Secured?

Owner vs. Investor Contribution Chart

This chart visualizes the Forge Points needed from the owner to secure each spot versus the amount the 1.9 investor will contribute.

What is a FoE 1.9 Calculator?

A foe 1.9 calculator is an essential tool for players of the online strategy game Forge of Empires. It is designed to simplify the process of leveling up Great Buildings (GBs) through a cooperative investment system known as the “1.9 Thread”. This system relies on players who have a level 80 Arc Great Building, which provides them with a 90% bonus on rewards from contributing to other players’ GBs. Consequently, they pay 1.9 times the base Forge Point (FP) reward to secure a spot, and their bonus allows them to break even. The calculator’s main purpose is to determine the exact number of FPs a GB owner must contribute themselves to “secure” each reward spot, so that a 1.9 investor can contribute without risk of being “sniped” by another player.

The FoE 1.9 Calculator Formula and Explanation

The core logic of any foe 1.9 calculator revolves around a few key calculations. The primary goal is to figure out the owner’s investment needed to guarantee that a spot can only be taken by someone paying the 1.9 rate.

The two most important formulas are:

1. Investor Cost Calculation:
   Investor Cost = Base Reward FP * 1.9
2. Owner’s Secure Cost Calculation:
   FP to Secure Spot = (Total FP for Level / 2) - (Investor Cost - Base Reward FP)
   A simpler way to think about securing a spot is that the remaining FPs to level the building must be less than twice the investor’s cost.

This tool automates these calculations, providing a clear path for the GB owner. Learn more about investment strategies with our guide to efficient building.

Variables Table

Key Variables in 1.9 Calculations

Variable	Meaning	Unit	Typical Range
Total FP for Level	The total Forge Points required to finish the GB’s current level.	Forge Points (FP)	100 – 10,000+
Base Reward	The standard FP reward for a specific contribution spot (e.g., P1, P2).	Forge Points (FP)	5 – 2,000+
Investor Cost	The amount an investor with a 90% Arc bonus pays (Reward * 1.9).	Forge Points (FP)	9 – 3,800+
Owner Secure Cost	The FPs the owner must add to make a spot safe for a 1.9 investor.	Forge Points (FP)	0 – 5,000+

Practical Examples

Example 1: Securing Top Spots on an Observatory

Let’s say you are leveling an Observatory from level 7 to 8. The total cost is 410 FP. The rewards are P1=60, P2=30, P3=10.

• Inputs: Total FP=410, P1 Reward=60, P2 Reward=30, P3 Reward=10.
• P1 Investor Cost: 60 * 1.9 = 114 FP.
• Results: The foe 1.9 calculator shows the owner must first add 91 FP to secure the P1 spot. After the P1 investor adds their 114 FP, the owner must add more to secure P2, and so on.

Example 2: High-Level Arc

Imagine leveling an Arc from 59 to 60, costing 2,703 FP. The P1 reward is 1,015 FP.

• Inputs: Total FP=2703, P1 Reward=1015.
• P1 Investor Cost: 1015 * 1.9 = 1929 FP.
• Results: The calculator determines that the remaining FP to level must be less than what the P1 investor will add. The owner only needs to ensure the total contribution is 774 FP before the P1 spot is secure. This can come from the owner or lower-level investors. Check our advanced Arc strategies for more details.

How to Use This foe 1.9 calculator

Using this calculator is a straightforward process designed to save you time and prevent costly errors.

1. Enter Total FP: Input the total amount of Forge Points needed for the Great Building’s next level. You can find this in the game on the GB’s level-up screen.
2. Enter Current FP: Add any Forge Points already on the building. The calculator will subtract this from the total needed.
3. Input Base Rewards: For each position (P1 through P5), enter the base FP reward shown in the game. Do not enter the 1.9 value; the calculator does this for you.
4. Click Calculate: Press the “Calculate Secure Costs” button.
5. Interpret Results: The table will show you the “1.9 Investor Cost” for each spot and, most importantly, the cumulative FPs you, the owner, must add to secure each spot. The chart provides a visual breakdown.
6. Copy for Guild: Use the “Copy Results” button to get a pre-formatted message to post in your guild’s 1.9 thread.

For a complete list of building costs, see our Great Building investment guide.

Key Factors That Affect 1.9 Contributions

• Arc Level: The entire system is based on the 90% reward bonus from a level 80 Arc. Investors with lower-level Arcs will lose FPs, while those with higher levels will profit.
• Timing and Sniping: A spot is “sniped” when another player contributes just enough to take a reward spot from an intended investor. Using a foe 1.9 calculator prevents this by ensuring the spot is mathematically “locked”.
• Guild Rules: Different guilds may have slightly different rules for their 1.9 threads, such as the order spots must be taken or how to post them. Always know your guild’s specific procedures.
• Total FP Cost: Higher-level buildings require a larger FP investment from the owner to secure the top spots, making the process more capital-intensive.
• Owner’s Contribution: The owner must have enough FPs on hand to add their share to secure the spots they want to advertise. Failing to do so can stall the leveling process.
• Investor Availability: The speed at which your GB levels depends on having active 1.9 investors ready to take the spots you offer. A clear, correct post generated by a foe 1.9 calculator helps attract them quickly.

Frequently Asked Questions (FAQ)

1. What does it mean to “secure” a spot?
Securing a spot means the GB owner has added enough of their own FPs so that a 1.9 investor’s contribution will lock them into that reward position, preventing anyone else from out-bidding (sniping) them.

2. Why is the rate 1.9?
A level 80 Arc provides a 90% bonus on rewards. A 100 FP reward becomes 190 FP. So, an investor contributing 190 FP (1.9 * 100) gets their full investment back.

3. Can I use this if my Arc is not level 80?
As an investor, you can, but you will lose FPs. For example, with a 70% bonus (1.7 rate), if you pay a 1.9 rate, you are overpaying. As a GB owner, this calculator works regardless of your own Arc level.

4. What does the “Cumulative” owner cost mean?
It’s the running total of FPs the owner needs to add. To secure P2, you need the total amount shown, not just the difference from the P1 cost.

5. Does the calculator account for FPs already on the building?
Yes. The “FP Already on GB” input is subtracted from the total FPs needed to secure spots, reducing the owner’s required contribution.

6. What happens if I enter the wrong reward values?
The calculation will be incorrect. This could lead to you not adding enough FPs, leaving your investors vulnerable to being sniped. Always double-check the in-game reward values.

7. Why does the calculator need all 5 reward spots?
It calculates the owner’s cost to secure all 5 spots. This allows you to plan how many FPs you need to add to open P1, then P1 & P2, and so on. Many players use our FP planning tool in conjunction with this calculator.

8. Is it better to self-level or use the 1.9 thread?
Using a 1.9 thread is almost always cheaper and faster for the GB owner than leveling entirely on your own. This foe 1.9 calculator demonstrates the significant discount you receive.