Provide your parameters to calculate inflation trends.
| Decade | Average Inflation Rate | Impact Profile |
|---|---|---|
| 2020s (to date) | 4.1% | High (Post-pandemic supply constraints) |
| 2010s | 1.8% | Low (Stable expansion phase) |
| 2000s | 2.6% | Moderate |
| 1990s | 3.0% | Moderate |
| 1980s | 5.6% | High (Post-inflation stabilization) |
| 1970s | 7.1% | Severe (Oil shocks & Stagflation) |
| 1960s | 2.3% | Low |
Reference tables, benchmarks, and research-backed context for interpreting your results.
At different inflation rates, the same nominal balance loses purchasing power at dramatically different speeds. This table shows what $100,000 in nominal terms is worth in today's dollars across common inflation scenarios:
| Inflation Rate | In 10 Years | In 20 Years | In 30 Years | In 40 Years |
|---|---|---|---|---|
| 2.0% (Fed target) | $82,035 | $67,297 | $55,207 | $45,289 |
| 2.5% (30-yr US avg) | $78,120 | $61,027 | $47,674 | $37,243 |
| 3.0% (moderate) | $74,409 | $55,368 | $41,199 | $30,656 |
| 4.0% (elevated) | $67,556 | $45,639 | $30,832 | $20,829 |
| 7.0% (2022 peak) | $50,835 | $25,842 | $13,137 | $6,678 |
| 10.0% (historical crisis) | $38,554 | $14,864 | $5,731 | $2,209 |
At the Fed's 2% target, $100,000 loses nearly half its purchasing power over 30 years. At 7% — the 2022 peak — it loses 86.9%.
Knowing what previous decades looked like helps you stress-test your projections beyond the optimistic baseline:
| Decade | Avg Annual Inflation | Key Driver | Notable Events |
|---|---|---|---|
| 1960s | 2.3% | Steady growth era | Vietnam War spending begins to accelerate late prices |
| 1970s | 7.1% | Oil shocks + stagflation | 1973 OPEC embargo, 1979 energy crisis |
| 1980s | 5.6% | Volcker disinflation | Fed raised rates to 20%+ to break inflation |
| 1990s | 3.0% | Tech boom, globalisation | Disinflation through productivity gains |
| 2000s | 2.6% | Housing bubble, GFC | 2008 crisis briefly pushed inflation negative |
| 2010s | 1.8% | QE era, subdued demand | Near-zero rates, below-target inflation |
| 2020s (to 2024) | 4.1% | Supply chain + stimulus | 2022 peaked at 9.1% CPI, highest since 1981 |
A single decade of elevated inflation can permanently reset your purchasing power baseline. Real returns matter far more than nominal returns.
The number that actually determines wealth growth is the gap between investment return and inflation (the "real return"). This matrix maps nominal returns against inflation:
| Nominal Return → | 3% | 5% | 7% | 10% | 12% |
|---|---|---|---|---|---|
| Inflation 2% | +1.0% real | +2.9% real | +4.9% real | +7.8% real | +9.8% real |
| Inflation 3% | 0.0% real | +1.9% real | +3.9% real | +6.8% real | +8.7% real |
| Inflation 4% | -1.0% real | +0.9% real | +2.9% real | +5.8% real | +7.7% real |
| Inflation 7% | -3.9% real | -1.9% real | 0.0% real | +2.8% real | +4.7% real |
*Real return calculated using Fisher equation: (1 + nominal) / (1 + inflation) − 1
Most people calculate their retirement number in today's dollars, then forget to account for the inflation that will occur before retirement. This creates a systematic underestimation of target portfolio size:
| Years to Retirement | Inflation Rate | Multiplier Needed | $1M Target Becomes |
|---|---|---|---|
| 10 years | 2.5% | 1.28× | $1,280,000 |
| 10 years | 4.0% | 1.48× | $1,480,000 |
| 20 years | 2.5% | 1.64× | $1,640,000 |
| 20 years | 4.0% | 2.19× | $2,190,000 |
| 30 years | 2.5% | 2.09× | $2,090,000 |
| 30 years | 4.0% | 3.24× | $3,240,000 |