Resource Trade Ratio Calculator
What Counts as a "Fair" Trade
Resource-trading games — Catan, Settlers-style economic games, and many worker-placement titles — assign relative value to different resources, whether through scarcity, production odds, or house-rule agreement. A fair trade ratio converts one resource's value into an equivalent amount of another, giving both sides a concrete number to negotiate around instead of a gut-feeling guess.
The Formula
Resource B Needed = Amount of A × Fair Trade Ratio
A Worked Example
If Resource A is valued at 3 points per unit and Resource B at 1 point per unit, the fair trade ratio is 3 ÷ 1 = 3 — meaning 1 unit of A is worth 3 units of B. Trading 2 units of A should fairly return 2 × 3 = 6 units of B.
Where This Gets Used
- Negotiating in-game trades — putting a concrete number behind a trade offer instead of relying purely on intuition or negotiation pressure.
- House-ruled value systems — groups that assign explicit point values to resources (common in customized or homebrew variants) can use this to keep trades consistent.
- Evaluating lopsided offers — quickly checking whether a proposed 3-for-1 trade is actually fair given each resource's relative scarcity or production rate.
How to Use This Calculator
- Enter the value of Resource A per unit.
- Enter the value of Resource B per unit.
- Enter the amount of Resource A being offered in the trade.
- Select Calculate to see the fair trade ratio and how much of Resource B that amount should be worth.
Related Calculations
Check tile production odds that often drive resource scarcity with the Catan Resource Probability Calculator, or track running scores with the Board Game Score Tracker Calculator.