Learning Center
How to use the calculators
Short guides on the formulas, the inputs, and getting the most out of each calculator.
- Guide
How Tantalum (Coltan) pricing works
Understand the inputs that drive the final price per kilo.
- Guide
Understanding the RRA percentage
What the RRA fee is, when it applies, and how the calculator handles it.
- Guide
Currency mixing pitfalls
Tantalum is priced in USD, but you collect RWF. Here's how the totals reconcile.
- Guide
Saving, reports, and history
Get the most out of saved calculations, exports, and sharing.