MicroFinance Transparency offers a basic tool to help microfinance institutions understand the factors that influence the "effective interest rate" or the APR (Annual Percentage Rate). It also provides formulas used to calculate comparative costs of different loan products using a standardized approach. Microfinance institutions can use this tool to for calculating their own effective interest rates, thereby demonstrating transparent for the pricing of their loan products to anyone who asks.
Calculating Transparent Prices Tool from MicroFinance Transparency 