What was ¥100 worth in 1940?
Japan Inflation & Purchasing Power Calculator
In 1940, ¥100 represented approximately 0.1 weeks of average wages — a modest expense.
Wartime Price Controls, Rationing, and the Birth of Bretton Woods
World War II brought government control of prices and widespread rationing across the Allies. While official inflation was suppressed, the real purchasing power of money was constrained by what was available to buy. The 1944 Bretton Woods Agreement established the US dollar as the world's reserve currency, pegged to gold at $35/oz. By 1945, US war production had created full employment and rising wages. The post-war baby boom and GI Bill created the modern middle class — home ownership rose from 44% to 55% within a decade.
During WWII rationing in the UK, the average family's food budget was fixed at approximately 1 shilling per person per day — leaving almost nothing for other expenditure.
¥100 as a serious sum
¥100 in 1940 was serious money for most households. This is past the weekly-budget range. A sum like this could fund a major purchase — furniture, a sewing machine, or months of rent. For a skilled worker it might represent a fifth of a year's earnings. Money people saved for rather than spent casually.
What was happening in 1940
In 1940, Europe was at war and the United States was not. France fell to Germany in six weeks that summer. Britain stood alone through the Blitz. The US economy was finally recovering as defence spending ramped up — something no New Deal programme had achieved.
What ¥100 could buy in 1940 vs today
Life in Japan in 1940
The average annual wage in Japan in 1940 was approximately ¥36,000. This means ¥100 represented roughly 0.1 weeks of average earnings — a modest expense. A loaf of bread cost approximately ¥28 and monthly rent averaged around ¥1200.
How ¥100 Lost Its Value Over Time
Frequently Asked Questions
What is ¥100 from 1940 worth in 2026?+
¥100 in 1940 is equivalent to approximately ¥1,047 in 2026. This represents a 947% increase due to cumulative inflation in Japan between 1940 and 2026.
How much has the ¥ lost in value since 1940?+
Since 1940, the Japan currency has lost approximately 90% of its purchasing power. In other words, what cost ¥100 in 1940 would cost ¥1,047 today — you need 10.5× more money to buy the same goods.
What was the average salary in Japan in 1940?+
Based on historical wage data, ¥100 in 1940 represented approximately 0.1 weeks of average wages in Japan. This helps illustrate not just the nominal price change, but what money actually meant in human terms — how long people had to work to earn it.
How accurate is this inflation calculation for 1940?+
This calculation uses official Consumer Price Index (CPI) data for Japan. For years before 1913 (USA) or equivalent periods for other countries, the calculation uses reconstructed price indices from academic sources including MeasuringWorth.com and the Bank of England's Millennium Dataset. Pre-industrial calculations carry a wider margin of uncertainty.
Why does purchasing power matter more than just inflation percentage?+
A simple inflation percentage tells you how prices changed, but purchasing power shows you what money could actually buy in human terms. ¥100 in 1940 bought a specific number of loaves of bread, weeks of rent, or months of wages — context that makes the number real and tangible, not just an abstract percentage.
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Want to flip the question? Instead of asking what ¥100 was worth in 1940, ask what your modern salary would have made you in that era. Our Rich-O-Meter takes any annual salary and shows where it would have ranked — working class, middle class, or wealthy elite — at any point in Japan's recorded history.
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Beyond history, there's geography. Our WealthMap compares your current salary to median income in around 90 countries today. A middle-class income in one country is wealthy-elite in another — and the gap between these places is often wider than the gap between eras.
Open the WealthMapThese calculations are estimates based on Japan's CPI data from Statistics Bureau of Japan; Bank of Japan historical series; Ohkawa & Shinohara (1979) Japanese economic growth data. Meiji period data (1868–1912) reconstructed from trade records. WWII hyperinflation (1945–1949) reflected. Post-war miracle growth and 1990s deflation captured. See our Methodology and Data Sources for full details. Not financial advice.