Identify the total benefit function, (TB(Q)), where (Q) is the quantity consumed or produced
Compute the change in total benefit for a small change in quantity
Use the formula (MB = Delta TB / Delta Q)
If the function is continuous, take the derivative: (MB = dTB/dQ)
Evaluate the marginal benefit at the specific quantity of interest
If given a table, subtract consecutive total benefit values and divide by the quantity change
If given discrete units, marginal benefit is the additional benefit from one more unit
Compare marginal benefit across quantities to see how it changes as quantity increases