Compute the marginal propensity to save.
Please do not make financial decisions based on these results.
What is the MPS Calculator?
Compute the marginal propensity to save. To use the MPS Calculator, enter change in saving, change in income; it returns mps, mpc, multiplier, and shows them instantly as you type.
Where the MPS Calculator fits
Compute the marginal propensity to save. The main figure it returns is the MPS, worked out from the values you enter.
It belongs with the other macroeconomics tools. If you are comparing options or checking a result from another angle, try the MPC Calculator, GDP Calculator (Gross Domestic Product) or the GDP Deflator Formula Calculator.
How to use the MPS Calculator
- Enter your numbers. The inputs are Change in saving ($), Change in income ($). Use real figures from your own records where you can. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the MPS, and the cards below show MPC, Multiplier. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the MPS Calculator using the default values shown in the calculator above:
Inputs
| Change in saving ($) | 200 |
|---|---|
| Change in income ($) | 1,000 |
Results
| MPS | 0.2 |
|---|---|
| MPC | 0.8 |
| Multiplier | 5× |
With these inputs the calculator returns MPS: 0.2. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Change in saving ($) from 200 to 240 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| MPS | 0.2 | 0.24 | +20% |
| MPC | 0.8 | 0.76 | -5% |
| Multiplier | 5× | 4.17× | -16.7% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the MPS Calculator reports MPS, mpc and multiplier. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
Why does MPS matter?
It sets the size of the spending multiplier: 1 ÷ MPS.
Where do the economic inputs come from?
Use official sources such as the BEA, BLS, Federal Reserve, IMF or World Bank for GDP, CPI, unemployment and money supply figures.
Are these tools for students or professionals?
Both. They apply textbook formulas, so they suit coursework and quick policy or market checks.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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