Calculate nominal risk free rate
The formula for risk premium, sometimes referred to as default risk premium, is the return on an investment minus the return that would be earned on a risk free investment. The risk premium is the amount that an investor would like to earn for the risk involved with a particular investment. Nominal Risk Free Rate = (1 + Real Risk Free Rate) / (1 + Inflation Rate) In a similar way, we have a nominal risk free rate and we want to calculate real risk free rate then we will just have to reshuffle the formula. If an interest rate is 10% = 0.1; and inflation is 3% = 0.03. In one case you come up with 333% in one case you come up with 106%. You subtract 1 to remove what would be the principle so you're back to focusing on only the rates, so the risk free interest rate is 6.7%.