GDP Gap Calculator — Output Gap & Recessionary/Inflationary Gap
Compute the GDP gap (output gap) — the difference between what an economy actually produces and what it could sustainably produce at full employment. A negative gap signals a recession; a positive gap signals overheating.
Recessionary gap — actual output is below potential; unemployment above natural rate
- 1
Actual − Potential GDP
23,500 − 25,000 = -1,500 - 2
Divide by Potential GDP
-1,500 ÷ 25,000 = -0.06 - 3
Output gap %
-0.06 × 100 = -6Negative means recessionary gap; positive means inflationary gap.
How does this calculator work?
Output Gap % = (Actual GDP − Potential GDP) / Potential GDP × 100. Negative = recessionary gap (idle resources, deflationary pressure); positive = inflationary gap (overheating, upward price pressure). Potential GDP is estimated — not observed — so output gaps carry substantial uncertainty and are revised heavily over time.
Formula
How this is calculated
Potential GDP is the level of output an economy can produce when operating at full capacity — meaning labour and capital are used at their sustainable, non-inflationary rates. It is not the theoretical maximum but the level consistent with stable inflation at the natural rate of unemployment. Potential GDP is unobservable and must be estimated — central banks, the IMF, the OECD, and national agencies use statistical filters (HP filter, Kalman filter) and structural models to derive it.
The output gap is (Actual GDP − Potential GDP) / Potential GDP × 100. A negative output gap (actual below potential) is a recessionary gap: idle workers and unused capital depress wages and prices — central banks typically respond with expansionary monetary policy (rate cuts, quantitative easing) and governments with fiscal stimulus. A positive output gap (actual above potential) is an inflationary gap: demand exceeds sustainable supply, pushing up wages and prices — policy-makers typically tighten policy to cool demand.
Because potential GDP is an estimate with wide uncertainty bands, output gaps are revised substantially over time. This calculator uses your entered values directly; for official output gap estimates, consult IMF World Economic Outlook or OECD Economic Outlook databases.
Frequently asked questions
A recessionary (deflationary) gap exists when actual GDP is below potential — unemployment exceeds the natural rate and productive resources are idle, putting downward pressure on prices and wages. An inflationary gap is when actual GDP exceeds potential — the economy runs "hot," pushing up inflation. Policy responses are opposite: stimulus for a recessionary gap, tightening for an inflationary gap.
Potential GDP cannot be directly measured. Common approaches include: (1) the Hodrick-Prescott (HP) filter, which statistically smooths actual GDP; (2) production function methods using estimated trends in labour, capital, and total factor productivity; (3) structural models incorporating the natural rate of unemployment (NAIRU). All methods involve judgment and are revised as new data arrive.
Not always and not immediately. The relationship between the output gap and inflation (the Phillips curve) has flattened in many economies since the 1990s — firms absorb demand through margins, global supply chains reduce domestic price pressure, and well-anchored inflation expectations dampen the pass-through. But a persistent positive gap does raise inflationary pressure over time.
Also known as
TG we-Calculate Editorial Team. (2026). GDP Gap Calculator — Output Gap & Recessionary/Inflationary Gap [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/gdp-gap-calculator
TG we-Calculate Editorial Team. "GDP Gap Calculator — Output Gap & Recessionary/Inflationary Gap." TG we-Calculate. 2026. https://we-calculate.com/calculator/gdp-gap-calculator.
TG we-Calculate Editorial Team, "GDP Gap Calculator — Output Gap & Recessionary/Inflationary Gap," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/gdp-gap-calculator
@misc{wecalculate_gdp_gap_calculator, title = {GDP Gap Calculator — Output Gap & Recessionary/Inflationary Gap}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/gdp-gap-calculator}}, year = {2026}, note = {TG we-Calculate} }
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