MPC Calculator Marginal propensity to consume. Change in consumption ($) Change in income ($) MPC 0.8 Step-by-step with your numbers: 1. Values used: 2. Change in consumption = 800 $ 3. Change in income = 1,000 $ 4. MPC = Change in consumption / Change in income = 800 / 1,000 = 0.8 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! MPC = how much of extra income gets spent. FAQ MPS? MPS = 1 − MPC (the share saved). Related calculators Spending Multiplier Calculator Fiscal multiplier. GDP Calculator Find GDP using the expenditure approach.