Determine the total revenue at one quantity level
Determine the total revenue at the next quantity level
Subtract the first total revenue from the second total revenue
Subtract the first quantity from the second quantity
Divide the change in total revenue by the change in quantity
Use the formula: Marginal Revenue = Change in Total Revenue / Change in Quantity
For a single additional unit, use: Marginal Revenue = Total Revenue at Q+1 – Total Revenue at Q