APC Calculator

Enter consumption spending and disposable income for the same period to get the average propensity to consume (APC = C ÷ Y), the matching average propensity to save (APS = 1 − APC), and the amount saved.

Quick Facts

Formula
APC = consumption ÷ disposable income
APS = 1 − APC, so the two always sum to exactly 1. An APC above 1 means dissaving — spending more than income for the period.

Your Results

Calculated
APC
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Average propensity to consume
APS
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Average propensity to save (1 − APC)
Amount saved
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Income − consumption
Spending rate
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APC as a percent of income

Ready

Enter consumption and disposable income for the same period, then press Calculate.

What this calculator does

The average propensity to consume (APC) is the share of disposable income that a household or economy spends on consumption rather than saving. This tool divides your consumption spending by your disposable income for the same period and reports the ratio, its saving counterpart, and the dollars set aside.

The formula

APC is a simple ratio from Keynesian economics:

  • APC = C ÷ Y, where C is consumption spending and Y is disposable income (income after taxes).
  • APS = 1 − APC is the average propensity to save. Because every dollar of disposable income is either spent or saved, APC and APS always add up to exactly 1.
  • Amount saved = Y − C, the dollar value behind the APS ratio.

For example, a household with $42,000 of consumption on $60,000 of disposable income has an APC of 42,000 ÷ 60,000 = 0.70, an APS of 0.30, and $18,000 saved.

Interpreting the result

An APC of 0.70 means 70 cents of every disposable dollar is spent. A value near 1 signals that almost all income is consumed and little is saved; a value above 1 means consumption exceeds income for the period (dissaving), funded by borrowing or drawing down past savings, and the APS turns negative. Lower-income households typically show a higher APC because a larger share of income covers necessities, while APC tends to fall as income rises.

Getting accurate results

  • Use disposable (after-tax) income, not gross income, since that is what is actually available to spend or save.
  • Keep both figures on the same period — both monthly or both annual — or the ratio is meaningless.
  • APC is a positive number that is usually between 0 and 1, but legitimately exceeds 1 during periods of dissaving.

Frequently Asked Questions

What does an APC greater than 1 mean?
An APC above 1 means consumption exceeds disposable income for the period — the household is dissaving, funding the gap by borrowing or drawing down existing savings. This is common for students, retirees living off accumulated wealth, or anyone whose income temporarily drops. The matching APS (1 − APC) is negative in that case.
What is the difference between APC and MPC?
APC is an average: total consumption divided by total disposable income (C ÷ Y). MPC, the marginal propensity to consume, is the fraction of one additional dollar of income that gets spent (change in C ÷ change in Y). In the Keynesian consumption function C = a + bY, the MPC is the constant b, while APC = a/Y + b, which falls as income rises.
Should I use gross or after-tax income to calculate APC?
Use disposable income — income after taxes and mandatory deductions — because that is the amount actually available to split between consumption and saving. Both figures must also cover the same period, such as one month or one year, or the ratio is meaningless.

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