GDP Gap Calculator - Actual vs Potential Output

The GDP gap, also called the output gap, compares an economy’s actual production with an estimate of sustainable potential production. The GDP gap calculator subtracts potential GDP from actual GDP and divides that difference by potential GDP for a percentage result. Under this sign convention, a negative result is a recessionary gap: actual activity is below estimated capacity. A positive result is an inflationary gap: activity is above estimated sustainable capacity. A zero result means the two inputs are equal, not that every industry or region is operating at an ideal level. Actual and potential GDP must use the same frequency, unit, currency, price basis, geographic coverage, and seasonal-adjustment convention. Real GDP is generally preferred because the concept concerns output volume rather than changes in prices. Potential GDP is not directly observed. Economists estimate it from labor supply, capital stock, productivity, trend growth, and models of capacity utilization. Different institutions can publish different potential-output estimates, and historical gaps may change substantially after revisions. The optional population produces an amount per person, which can make gaps from differently sized economies easier to discuss. The unemployment and inflation inputs preserve useful scenario context, but they are not inserted into the output-gap formula. Relationships among output, unemployment, and inflation are neither fixed nor instantaneous. Okun’s law and Phillips-curve models are separate empirical tools with coefficients that vary over time and across economies. Avoid inferring a precise unemployment or inflation outcome from this result alone. Use the gap alongside growth, employment, inflation, capacity utilization, and financial conditions. A recessionary gap may be associated with unused resources, while a persistent positive gap can add price pressure, but supply shocks can break those simple patterns. Scenario analysis is valuable because potential GDP is uncertain: calculate the result with several credible estimates instead of treating one point value as fact. This educational calculator checks arithmetic and clarifies the selected sign convention. It does not identify a business-cycle turning point, prescribe fiscal or monetary policy, or replace official forecasts and model documentation.