Phillips Curve Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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The fastest way to make a finance estimate useful is to know exactly what went into it. Phillips Curve Calculator puts the relevant inputs beside the result so you can test the calculation instead of treating the number as a black box. On this page, it uses expected inflation and an unemployment gap to estimate inflation under a simple Phillips-curve relationship.

What this calculator does

Phillips Curve Calculator uses expected inflation and an unemployment gap to estimate inflation under a simple Phillips-curve relationship. Its visible inputs are Expected inflation rate, Natural unemployment rate, Actual unemployment rate, Phillips curve slope. The article follows those fields and the calculation that is actually available on this page; it does not silently add live market feeds, tax tables, legal eligibility tests, or other variables that are not present in the tool.

How to use it

Enter Expected inflation rate, Natural unemployment rate, Actual unemployment rate, Phillips curve slope. Use the units and percentage scale shown beside each field, and keep values on the same time basis when the formula compares income, rates, prices, balances, or work hours.

How the calculation works

Estimated inflation = expected inflation − slope × (actual unemployment − natural unemployment).

Example

Using the page’s demonstration values (Expected inflation rate = 3; Natural unemployment rate = 4; Actual unemployment rate = 6; Phillips curve slope = 0.5) and leaving the remaining defaults unchanged, the calculator returns 2% for phillips-curve inflation estimate. Replace the sample inputs with values from the same period and definition before interpreting your own result.

How to interpret the result

Read the result as a model of the economic relationship represented by the inputs, not as a forecast of what an economy, market, currency, or policy authority will do next. Economic data are definition-sensitive: nominal versus real values, time periods, population bases, and price indexes must be aligned before comparing results.

Limitations and notes

The slope and natural-rate inputs are assumptions. Inflation can be affected by expectations, supply shocks, productivity, exchange rates, policy, and other factors not represented here. Simplified macroeconomic formulas hold other influences constant. Revisions to source data, measurement definitions, expectations, policy responses, market frictions, and nonlinear behavior can make real-world outcomes differ from the clean relationship shown here.