Okun's Law Calculator — GDP Growth & Unemployment
Enter any two of GDP growth rate, unemployment change, and the Okun coefficient to solve for the third — and visualise the Okun relationship on an interactive chart.
Solve for
%
pp
Derived from Okun's law: %ΔGDP = c − β × ΔU
- 1
β × ΔU
2 × 1 = 2 - 2
GDP growth rate
2.5 − 2 = 0.50Okun's law: %ΔGDP = c − β × ΔU.
How does this calculator work?
Okun's law: %ΔGDP = c − β × ΔU, where c ≈ 2–3 % (potential growth) and β ≈ 2 for the US. If unemployment rises 1 pp, GDP growth falls ~2 pp below trend. Enter any two of the three unknowns to solve for the third. The coefficient β varies by country (0.5–3) and year; treat it as an editable empirical estimate.
Formula
How this is calculated
Okun's law is an empirical relationship first described by economist Arthur Okun in 1962. In its difference form it states that the annual percentage change in real GDP (%ΔY) equals the economy's potential (trend) growth rate c minus the Okun coefficient β multiplied by the change in the unemployment rate (ΔU, in percentage points). When unemployment rises by 1 percentage point above trend, GDP typically falls by about β percent relative to trend — Okun estimated β ≈ 2 for the post-war US economy, although modern estimates cluster around 1.5–2.5.
The relationship runs both ways: strong GDP growth above the trend rate tends to draw workers in and reduces unemployment, while below-trend growth allows unemployment to drift up. The trend growth rate c represents the economy's potential — the GDP growth that can be sustained without closing or widening the output gap. For most advanced economies in 2024, consensus potential growth rates range from about 1 % (euro area) to 2.5 % (US). These defaults are editable estimates; update them to match official forecasts (IMF WEO, OECD, Fed, ECB) for your country and year.
The Okun coefficient itself varies by country and period. Labour-market flexibility, the role of part-time work, and productivity trends all affect how sharply unemployment responds to output changes. European economies typically show smaller β values (0.5–1.5) because rigid labour laws reduce hiring/firing, while more flexible anglophone economies show larger coefficients.
Frequently asked questions
β measures how many percentage points of GDP growth are lost for every 1 percentage point rise in the unemployment rate. In the US, β ≈ 2, so if unemployment rises by 1 pp, GDP growth falls about 2 pp below its trend. A higher β means labour market changes translate more sharply into output changes.
Because firms respond to slowdowns by reducing hours, cutting overtime, and hoarding skilled workers before laying anyone off. The labour force participation rate also changes — some workers stop looking when conditions worsen (discouraged workers), which holds the measured unemployment rate below what raw output loss would imply.
No. It is a statistical regularity, not a law of physics. The relationship can break down during unusual shocks — the 2008 financial crisis, the 2020 pandemic — when unemployment jumps far more (or less) than GDP changes alone would predict. It is most reliable for forecasting average behaviour over multi-year horizons.
Also known as
TG we-Calculate Editorial Team. (2026). Okun's Law Calculator — GDP Growth & Unemployment [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/okun-law-calculator
TG we-Calculate Editorial Team. "Okun's Law Calculator — GDP Growth & Unemployment." TG we-Calculate. 2026. https://we-calculate.com/calculator/okun-law-calculator.
TG we-Calculate Editorial Team, "Okun's Law Calculator — GDP Growth & Unemployment," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/okun-law-calculator
@misc{wecalculate_okun_law_calculator, title = {Okun's Law Calculator — GDP Growth & Unemployment}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/okun-law-calculator}}, year = {2026}, note = {TG we-Calculate} }
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