Advanced Fair Trade Calculator
Example Data Table
| Offered Era | Requested Era | Offered Qty | Fair Requested Qty | Basic Ratio |
|---|---|---|---|---|
| Iron Age | Iron Age | 100 | 100 | 1:1 |
| Iron Age | Early Middle Ages | 200 | 100 | 2:1 lower to higher |
| High Middle Ages | Early Middle Ages | 100 | 200 | 1:2 higher to lower |
| Colonial Age | Industrial Age | 200 | 100 | 2:1 lower to higher |
Formula Used
The calculator uses an era weighted value model. Each era receives an index. Each higher era doubles the unit value.
Unit Value = 2 ^ Era Index
Gross Offered Value = Offered Quantity × Offered Unit Value
Net Offered Value = Gross Offered Value × (1 - Market Fee / 100)
Requested Value = Requested Quantity × Requested Unit Value
Fair Requested Quantity = Net Offered Value / Requested Unit Value
Gap Percentage = (Net Offered Value - Requested Value) / Requested Value × 100
This is a planning method. Guild rules, friendship trades, and world customs may use different ratios.
How To Use This Calculator
- Select the good you want to offer.
- Enter the quantity you plan to trade.
- Choose the era of the offered good.
- Select the good you want to receive.
- Enter the requested quantity.
- Choose the era of the requested good.
- Add market fee and tolerance values if needed.
- Enter current stock values for inventory planning.
- Press the calculate button.
- Review the result above the form.
- Download the CSV or PDF record if required.
Fair Trade Planning
A Forge of Empires trade looks simple at first. One player offers goods. Another player gives different goods back. The value changes when the goods belong to different eras. A newer era good usually carries more value than an older era good. This calculator turns that idea into a clear exchange check.
Why Era Value Matters
The tool assigns an index to each era. Then it doubles value for each step upward. That creates a practical scale for fair comparison. A same era swap stays one to one. A one era upgrade needs about two older goods for one newer good. A two era jump needs about four older goods for one newer good.
Advanced Trade Controls
The calculator also includes a market fee field. Fees lower the effective value of the offered side. A tolerance setting lets you decide how strict the fairness check should be. Small differences may be acceptable when helping guildmates. Larger differences can show a risky or one sided trade. Stock fields help you see whether the swap improves your city balance.
Useful Player Decisions
Use this page before posting a trade. It can show the fair requested amount, the effective value, and the fairness gap. It also labels the offer as fair, favorable, or unfavorable. That saves time when you compare many goods. It is useful during event preparation, guild expedition support, settlement planning, and recurring neighborhood trades.
Reading The Result
A fair result means both sides are close after era weight and fees. A favorable result means the offered side gives more value than requested. An unfavorable result means you may need to increase your offer, reduce the request, or change the era mix. The result is a guide. Friends and guild rules may use different ratios. Review both quantities before confirming, because round lots can hide small value gaps during fast guild exchanges and urgent quests.
Better Trade Habits
Keep notes for common goods. Check trades again when moving into a new era. Avoid guessing during busy moments. Use the export buttons when you want a saved record. A consistent method keeps negotiations simple. It also makes shared guild trading easier, cleaner, and more transparent for every active player.
Frequently Asked Questions
What does this calculator check?
It compares offered and requested goods using era value, quantity, fee, and tolerance. It shows whether the trade is fair, favorable, or unfavorable.
Is this an official Forge of Empires rule?
No. It is a planning model based on era weighted value. Your guild, friends, or world market may follow different trading habits.
Why does the calculator double each era value?
Doubling gives a simple scale for comparing goods across eras. It helps estimate fair ratios when one side trades older or newer goods.
What is tolerance percentage?
Tolerance is the allowed difference between both sides. A five percent tolerance means small value gaps can still count as fair.
What does market fee do?
The market fee reduces the effective offered value. Use it when a cost, penalty, or custom trade adjustment should be included.
Why is rounded fair quantity useful?
Many players trade in clean lots. Rounding helps create practical quantities instead of awkward decimal values.
Can I use this for guild trades?
Yes. It can support guild discussions and trade planning. Still, follow your guild rules when they differ from this model.
What should I do with an unfavorable result?
You can raise the offered quantity, lower the requested quantity, choose a closer era, or accept the difference for friendship support.