Identify the total utility at each quantity consumed
Calculate the change in total utility between two consecutive quantities
Calculate the change in quantity between those two quantities
Divide the change in total utility by the change in quantity
Use the formula: Marginal Utility = Change in Total Utility / Change in Quantity
For each additional unit consumed, repeat the calculation
If quantity increases by 1 unit, marginal utility equals the difference in total utility between the two units
Check whether marginal utility is positive, negative, or zero
Compare marginal utility across units to see how satisfaction changes with each additional unit