Average Propensity to Consume (APC) Calculator
From total consumption and disposable income, compute the average propensity to consume (APC), average propensity to save (APS) and amount saved.
Input Data
Results
At a glance:APC = total consumption / disposable income. APS = 1 - APC. APC between 0 and 1 means saving; =1 break-even; >1 dissaving (borrowing). APC looks at the whole (average); MPC looks at the incremental. Low-income households tend to have higher APC.
Formula
APC = total consumption / disposable income.
APS = 1 - APC.
Amount not consumed = disposable income - total consumption.
$$APC = \dfrac{Consumption}{DisposableIncome}$$$$APS = 1 - APC$$How to Use
- Enter total consumption for the period.
- Enter disposable (after-tax) income for the same period.
- View APC, APS and the amount not consumed.
FAQ
How is APC different from MPC?
APC is the share of total disposable income spent; MPC (marginal propensity to consume) is how much of an extra dollar of income is spent. You might spend 70% of your income overall (APC 0.7) but only 40% of a raise (MPC 0.4).
Why use disposable rather than pre-tax income?
APC measures how freely-available income is split between consumption and saving, so the denominator should be after-tax disposable income. Using pre-tax income understates APC and breaks comparability.
What does APC > 1 mean?
It means consumption exceeds disposable income — dissaving. Usually funded by drawing down savings, credit cards or one-off spending. Occasional spikes are normal; sustained dissaving needs budget review.
What is a healthy APC?
APC has no absolute 'good' value. The basic floor is APC < 1 (positive saving). A common personal-finance target is a 10-20% saving rate (APC about 0.8-0.9 or lower); the 50/30/20 rule suggests 20% to saving/debt. Low-income households naturally have higher APC due to essential costs — judge by income level and life stage, not a single number.
Why is APC usually greater than MPC?
Keynes's consumption function: consumption = autonomous consumption + MPC x income. Autonomous consumption is a 'floor' (basic spending even at zero income) that lifts the average (APC) above the slope (MPC). As income rises, the fixed floor is spread thinner, so APC falls toward MPC. This is why low-income APC is high and high-income APC is low.
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References
Content review: Calculatorism Finance Team. Results are for reference only; please refer to the relevant authorities for the official figures.