Foe Arc Calculator

Calculate Great Building investment rewards and spot security instantly.

90 FP

Arc Bonus Portion

400 FP

FPs to Secure Spot

800 FP

Remaining FPs for Level

Projected Rewards for Standard Arc Milestones

Arc Level	Bonus %	Calculated Reward	Profit (vs. Base)

What is a FoE Arc Calculator?

A foe arc calculator is an essential tool for players of Forge of Empires who want to maximize their Great Building (GB) investments. The Arc is widely considered the most important building in the game because it provides a percentage bonus to any rewards you receive from contributing to other players’ Great Buildings. Whether you are aiming for a “1.9 thread” or looking for great building sniping opportunities, understanding the math behind your Arc’s bonus is key to growth.

Using a foe arc calculator allows you to quickly determine exactly how many Forge Points (FPs) you will receive back from a specific contribution. This helps in maintaining a healthy FP bank and ensuring that your contributions are both fair to your guildmates and profitable for your own development.

FoE Arc Calculator Formula and Mathematical Explanation

The math behind the foe arc calculator is straightforward but critical for high-level play. The primary goal is to calculate the final reward based on the “base” reward set by the game for a specific ranking position (1st through 5th).

The Core Formula:

Final Reward = floor(Base Reward × (1 + (Arc Bonus % / 100)))

Variable	Meaning	Unit	Typical Range
Base Reward	Original FP reward for the spot	Forge Points (FP)	5 – 5,000+
Arc Bonus	The percentage multiplier from your Arc	Percentage (%)	0% – 100%+
Total Needed	FPs required to level the building	Forge Points (FP)	100 – 15,000+
Invested	FPs already in the building	Forge Points (FP)	0 – Total Needed

Table 1: Variables used in the foe arc calculator.

Practical Examples (Real-World Use Cases)

Example 1: The Level 80 “1.9” Standard

If you have a Level 80 Arc, your bonus is exactly 90%. If you want to take the 1st place spot on a building where the base reward is 500 FP, the foe arc calculator performs the following: 500 × 1.9 = 950 FP. In a 1.9 donation thread, you would contribute exactly 950 FP. You receive 950 FP back when the building levels, meaning you spent zero net FPs to gain blueprints and medals.

Example 2: Sniping for Profit

Suppose you see a building where 1st place has a base reward of 200 FP. Your Arc bonus is 90% (making your reward 380 FP). If the building only needs 300 more FPs to level, and no one else has contributed significantly, you can “snipe” the spot by putting in 151 FPs. Your foe arc calculator shows a profit of 229 FPs (380 – 151).

How to Use This FoE Arc Calculator

1. Enter Base FP Reward: Find the GB you want to invest in and look at the reward for the position you are targeting.
2. Input Your Arc Bonus: Check your own Arc’s level to find your current percentage bonus.
3. Check Total Needed: Enter the total Forge Points required for the current level of that GB.
4. Input Current Progress: Enter how many FPs have already been invested by the owner and other players.
5. Analyze Results: The calculator will show you your total reward, how many FPs you need to “lock” the spot so no one can outbid you, and your net profit.

Key Factors That Affect FoE Arc Calculator Results

• Arc Level: This is the single biggest factor. A level 80 Arc provides a 90% bonus, but higher levels can push this past 100%.
• Base Reward Scaling: As Great Buildings reach higher levels, their base rewards increase significantly, making a foe arc calculator even more vital.
• Contribution Timing: Using a GB investment tool helps you time your donation so you spend the minimum required to secure a spot.
• Owner Self-Donation: If the owner puts in many FPs, the amount you need to lock a spot decreases.
• Competition: Other snipers may be watching the same building. Rapid calculation is necessary.
• Guild Rules: Many guilds use a specific FP investment strategy like 1.9 or 1.85 threads which dictate how you use the calculator.

Frequently Asked Questions (FAQ)

What is a 1.9 thread?

It is a community agreement where players with Level 80 Arcs (90% bonus) donate 1.9x the base reward to each other to help level buildings quickly and for free.

Does the foe arc calculator round up or down?

Forge of Empires always rounds down (mathematical floor) to the nearest whole Forge Point for rewards.

Can my bonus go over 100%?

Yes, at Level 180, an Arc provides a 100% bonus. Any level above that results in a Arc level 80 bonus that actually generates more FPs than you put in at a 1.9 rate.

How do I “lock” a spot?

A spot is locked when the FPs you have contributed plus the FPs remaining to be filled are such that no other player can mathematically overtake your position.

Why does the calculator show “FPs to Secure”?

This tells you exactly how much you need to invest right now so that even if another player fills the rest of the building, they cannot take your rank.

What is “sniping”?

Sniping is using a Forge of Empires reward calculator to find spots where you can invest fewer FPs than you get back as a reward.

Is the Arc the only building with this bonus?

Yes, the Arc is unique. No other building provides a Forge Points efficiency boost for contributing to others.

Should I level my Arc to 80 first?

Most experts recommend leveling the Arc to 80 as your first major goal because it unlocks the ability to participate in 1.9 threads effectively.

Related Tools and Internal Resources

• GB Investment Tool – A deeper look at long-term Great Building planning.
• Forge of Empires Reward Calculator – Compare rewards across different Great Buildings.
• Great Building Sniping Guide – Learn the art of profitable FP hunting.
• Arc Level 80 Bonus Breakdown – See the math behind the level 80 milestone.
• FP Investment Strategy – Best practices for growing your FP bank.
• Forge Points Efficiency – Tips for maximizing your daily FP production.