Doubling-time example library
Rule of 72 Examples
Browse 200 worked examples covering doubling money, investment growth, savings growth, inflation, portfolio growth, retirement planning, index fund assumptions, and high-yield savings assumptions.
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Doubling Money and Investing Examples
Compare how different annual return assumptions change estimated doubling time for simple money-doubling and investment-growth scenarios.
- How Long Could $1,000 Take to Double at 3%? $1,000 context amount · 3% annual rate
- How Long Could $1,000 Take to Double at 4%? $1,000 context amount · 4% annual rate
- How Long Could $1,000 Take to Double at 6%? $1,000 context amount · 6% annual rate
- How Long Could $1,000 Take to Double at 8%? $1,000 context amount · 8% annual rate
- How Long Could $1,000 Take to Double at 12%? $1,000 context amount · 12% annual rate
- How Long Could $5,000 Take to Double at 3%? $5,000 context amount · 3% annual rate
- How Long Could $5,000 Take to Double at 4%? $5,000 context amount · 4% annual rate
- How Long Could $5,000 Take to Double at 6%? $5,000 context amount · 6% annual rate
- How Long Could $5,000 Take to Double at 8%? $5,000 context amount · 8% annual rate
- How Long Could $5,000 Take to Double at 12%? $5,000 context amount · 12% annual rate
- How Long Could $10,000 Take to Double at 3%? $10,000 context amount · 3% annual rate
- How Long Could $10,000 Take to Double at 4%? $10,000 context amount · 4% annual rate
- How Long Could $10,000 Take to Double at 6%? $10,000 context amount · 6% annual rate
- How Long Could $10,000 Take to Double at 8%? $10,000 context amount · 8% annual rate
- How Long Could $10,000 Take to Double at 12%? $10,000 context amount · 12% annual rate
- How Long Could $25,000 Take to Double at 3%? $25,000 context amount · 3% annual rate
- How Long Could $25,000 Take to Double at 4%? $25,000 context amount · 4% annual rate
- How Long Could $25,000 Take to Double at 6%? $25,000 context amount · 6% annual rate
- How Long Could $25,000 Take to Double at 8%? $25,000 context amount · 8% annual rate
- How Long Could $25,000 Take to Double at 12%? $25,000 context amount · 12% annual rate
- How Long Could $50,000 Take to Double at 3%? $50,000 context amount · 3% annual rate
- How Long Could $50,000 Take to Double at 4%? $50,000 context amount · 4% annual rate
- How Long Could $50,000 Take to Double at 6%? $50,000 context amount · 6% annual rate
- How Long Could $50,000 Take to Double at 8%? $50,000 context amount · 8% annual rate
- How Long Could $50,000 Take to Double at 12%? $50,000 context amount · 12% annual rate
- How Many Years Could an Investment of $5,000 Take to Double at 5%? $5,000 context amount · 5% annual rate
- How Many Years Could an Investment of $5,000 Take to Double at 7%? $5,000 context amount · 7% annual rate
- How Many Years Could an Investment of $5,000 Take to Double at 9%? $5,000 context amount · 9% annual rate
- How Many Years Could an Investment of $5,000 Take to Double at 10%? $5,000 context amount · 10% annual rate
- How Many Years Could an Investment of $5,000 Take to Double at 12%? $5,000 context amount · 12% annual rate
- How Many Years Could an Investment of $10,000 Take to Double at 5%? $10,000 context amount · 5% annual rate
- How Many Years Could an Investment of $10,000 Take to Double at 7%? $10,000 context amount · 7% annual rate
- How Many Years Could an Investment of $10,000 Take to Double at 9%? $10,000 context amount · 9% annual rate
- How Many Years Could an Investment of $10,000 Take to Double at 10%? $10,000 context amount · 10% annual rate
- How Many Years Could an Investment of $10,000 Take to Double at 12%? $10,000 context amount · 12% annual rate
- How Many Years Could an Investment of $25,000 Take to Double at 5%? $25,000 context amount · 5% annual rate
- How Many Years Could an Investment of $25,000 Take to Double at 7%? $25,000 context amount · 7% annual rate
- How Many Years Could an Investment of $25,000 Take to Double at 9%? $25,000 context amount · 9% annual rate
- How Many Years Could an Investment of $25,000 Take to Double at 10%? $25,000 context amount · 10% annual rate
- How Many Years Could an Investment of $25,000 Take to Double at 12%? $25,000 context amount · 12% annual rate
- How Many Years Could an Investment of $50,000 Take to Double at 5%? $50,000 context amount · 5% annual rate
- How Many Years Could an Investment of $50,000 Take to Double at 7%? $50,000 context amount · 7% annual rate
- How Many Years Could an Investment of $50,000 Take to Double at 9%? $50,000 context amount · 9% annual rate
- How Many Years Could an Investment of $50,000 Take to Double at 10%? $50,000 context amount · 10% annual rate
- How Many Years Could an Investment of $50,000 Take to Double at 12%? $50,000 context amount · 12% annual rate
- How Many Years Could an Investment of $100,000 Take to Double at 5%? $100,000 context amount · 5% annual rate
- How Many Years Could an Investment of $100,000 Take to Double at 7%? $100,000 context amount · 7% annual rate
- How Many Years Could an Investment of $100,000 Take to Double at 9%? $100,000 context amount · 9% annual rate
- How Many Years Could an Investment of $100,000 Take to Double at 10%? $100,000 context amount · 10% annual rate
- How Many Years Could an Investment of $100,000 Take to Double at 12%? $100,000 context amount · 12% annual rate
Savings and High-Yield Savings Examples
Review how modest savings rates and higher-yield assumptions change the Rule of 72 estimate.
- How Long Could Savings of $1,000 Take to Double at 1%? $1,000 context amount · 1% annual rate
- How Long Could Savings of $1,000 Take to Double at 2%? $1,000 context amount · 2% annual rate
- How Long Could Savings of $1,000 Take to Double at 3%? $1,000 context amount · 3% annual rate
- How Long Could Savings of $1,000 Take to Double at 4%? $1,000 context amount · 4% annual rate
- How Long Could Savings of $1,000 Take to Double at 5%? $1,000 context amount · 5% annual rate
- How Long Could Savings of $5,000 Take to Double at 1%? $5,000 context amount · 1% annual rate
- How Long Could Savings of $5,000 Take to Double at 2%? $5,000 context amount · 2% annual rate
- How Long Could Savings of $5,000 Take to Double at 3%? $5,000 context amount · 3% annual rate
- How Long Could Savings of $5,000 Take to Double at 4%? $5,000 context amount · 4% annual rate
- How Long Could Savings of $5,000 Take to Double at 5%? $5,000 context amount · 5% annual rate
- How Long Could Savings of $10,000 Take to Double at 1%? $10,000 context amount · 1% annual rate
- How Long Could Savings of $10,000 Take to Double at 2%? $10,000 context amount · 2% annual rate
- How Long Could Savings of $10,000 Take to Double at 3%? $10,000 context amount · 3% annual rate
- How Long Could Savings of $10,000 Take to Double at 4%? $10,000 context amount · 4% annual rate
- How Long Could Savings of $10,000 Take to Double at 5%? $10,000 context amount · 5% annual rate
- How Long Could Savings of $20,000 Take to Double at 1%? $20,000 context amount · 1% annual rate
- How Long Could Savings of $20,000 Take to Double at 2%? $20,000 context amount · 2% annual rate
- How Long Could Savings of $20,000 Take to Double at 3%? $20,000 context amount · 3% annual rate
- How Long Could Savings of $20,000 Take to Double at 4%? $20,000 context amount · 4% annual rate
- How Long Could Savings of $20,000 Take to Double at 5%? $20,000 context amount · 5% annual rate
- How Long Could Savings of $50,000 Take to Double at 1%? $50,000 context amount · 1% annual rate
- How Long Could Savings of $50,000 Take to Double at 2%? $50,000 context amount · 2% annual rate
- How Long Could Savings of $50,000 Take to Double at 3%? $50,000 context amount · 3% annual rate
- How Long Could Savings of $50,000 Take to Double at 4%? $50,000 context amount · 4% annual rate
- How Long Could Savings of $50,000 Take to Double at 5%? $50,000 context amount · 5% annual rate
- How Long Could a High-Yield Savings Balance of $1,000 Take to Double at 3.5%? $1,000 context amount · 3.5% annual rate
- How Long Could a High-Yield Savings Balance of $1,000 Take to Double at 4%? $1,000 context amount · 4% annual rate
- How Long Could a High-Yield Savings Balance of $1,000 Take to Double at 4.5%? $1,000 context amount · 4.5% annual rate
- How Long Could a High-Yield Savings Balance of $1,000 Take to Double at 5%? $1,000 context amount · 5% annual rate
- How Long Could a High-Yield Savings Balance of $1,000 Take to Double at 5.25%? $1,000 context amount · 5.25% annual rate
- How Long Could a High-Yield Savings Balance of $5,000 Take to Double at 3.5%? $5,000 context amount · 3.5% annual rate
- How Long Could a High-Yield Savings Balance of $5,000 Take to Double at 4%? $5,000 context amount · 4% annual rate
- How Long Could a High-Yield Savings Balance of $5,000 Take to Double at 4.5%? $5,000 context amount · 4.5% annual rate
- How Long Could a High-Yield Savings Balance of $5,000 Take to Double at 5%? $5,000 context amount · 5% annual rate
- How Long Could a High-Yield Savings Balance of $5,000 Take to Double at 5.25%? $5,000 context amount · 5.25% annual rate
- How Long Could a High-Yield Savings Balance of $10,000 Take to Double at 3.5%? $10,000 context amount · 3.5% annual rate
- How Long Could a High-Yield Savings Balance of $10,000 Take to Double at 4%? $10,000 context amount · 4% annual rate
- How Long Could a High-Yield Savings Balance of $10,000 Take to Double at 4.5%? $10,000 context amount · 4.5% annual rate
- How Long Could a High-Yield Savings Balance of $10,000 Take to Double at 5%? $10,000 context amount · 5% annual rate
- How Long Could a High-Yield Savings Balance of $10,000 Take to Double at 5.25%? $10,000 context amount · 5.25% annual rate
- How Long Could a High-Yield Savings Balance of $25,000 Take to Double at 3.5%? $25,000 context amount · 3.5% annual rate
- How Long Could a High-Yield Savings Balance of $25,000 Take to Double at 4%? $25,000 context amount · 4% annual rate
- How Long Could a High-Yield Savings Balance of $25,000 Take to Double at 4.5%? $25,000 context amount · 4.5% annual rate
- How Long Could a High-Yield Savings Balance of $25,000 Take to Double at 5%? $25,000 context amount · 5% annual rate
- How Long Could a High-Yield Savings Balance of $25,000 Take to Double at 5.25%? $25,000 context amount · 5.25% annual rate
- How Long Could a High-Yield Savings Balance of $50,000 Take to Double at 3.5%? $50,000 context amount · 3.5% annual rate
- How Long Could a High-Yield Savings Balance of $50,000 Take to Double at 4%? $50,000 context amount · 4% annual rate
- How Long Could a High-Yield Savings Balance of $50,000 Take to Double at 4.5%? $50,000 context amount · 4.5% annual rate
- How Long Could a High-Yield Savings Balance of $50,000 Take to Double at 5%? $50,000 context amount · 5% annual rate
- How Long Could a High-Yield Savings Balance of $50,000 Take to Double at 5.25%? $50,000 context amount · 5.25% annual rate
Inflation and Purchasing Power Examples
Use the same shortcut to estimate how long inflation could take to double prices and erode purchasing power.
- How Long Could 2% Inflation Take to Double Costs and Cut the Purchasing Power of $1,000 in Half? $1,000 context amount · 2% annual rate
- How Long Could 2.5% Inflation Take to Double Costs and Cut the Purchasing Power of $1,000 in Half? $1,000 context amount · 2.5% annual rate
- How Long Could 3% Inflation Take to Double Costs and Cut the Purchasing Power of $1,000 in Half? $1,000 context amount · 3% annual rate
- How Long Could 4% Inflation Take to Double Costs and Cut the Purchasing Power of $1,000 in Half? $1,000 context amount · 4% annual rate
- How Long Could 6% Inflation Take to Double Costs and Cut the Purchasing Power of $1,000 in Half? $1,000 context amount · 6% annual rate
- How Long Could 2% Inflation Take to Double Costs and Cut the Purchasing Power of $5,000 in Half? $5,000 context amount · 2% annual rate
- How Long Could 2.5% Inflation Take to Double Costs and Cut the Purchasing Power of $5,000 in Half? $5,000 context amount · 2.5% annual rate
- How Long Could 3% Inflation Take to Double Costs and Cut the Purchasing Power of $5,000 in Half? $5,000 context amount · 3% annual rate
- How Long Could 4% Inflation Take to Double Costs and Cut the Purchasing Power of $5,000 in Half? $5,000 context amount · 4% annual rate
- How Long Could 6% Inflation Take to Double Costs and Cut the Purchasing Power of $5,000 in Half? $5,000 context amount · 6% annual rate
- How Long Could 2% Inflation Take to Double Costs and Cut the Purchasing Power of $10,000 in Half? $10,000 context amount · 2% annual rate
- How Long Could 2.5% Inflation Take to Double Costs and Cut the Purchasing Power of $10,000 in Half? $10,000 context amount · 2.5% annual rate
- How Long Could 3% Inflation Take to Double Costs and Cut the Purchasing Power of $10,000 in Half? $10,000 context amount · 3% annual rate
- How Long Could 4% Inflation Take to Double Costs and Cut the Purchasing Power of $10,000 in Half? $10,000 context amount · 4% annual rate
- How Long Could 6% Inflation Take to Double Costs and Cut the Purchasing Power of $10,000 in Half? $10,000 context amount · 6% annual rate
- How Long Could 2% Inflation Take to Double Costs and Cut the Purchasing Power of $25,000 in Half? $25,000 context amount · 2% annual rate
- How Long Could 2.5% Inflation Take to Double Costs and Cut the Purchasing Power of $25,000 in Half? $25,000 context amount · 2.5% annual rate
- How Long Could 3% Inflation Take to Double Costs and Cut the Purchasing Power of $25,000 in Half? $25,000 context amount · 3% annual rate
- How Long Could 4% Inflation Take to Double Costs and Cut the Purchasing Power of $25,000 in Half? $25,000 context amount · 4% annual rate
- How Long Could 6% Inflation Take to Double Costs and Cut the Purchasing Power of $25,000 in Half? $25,000 context amount · 6% annual rate
- How Long Could 2% Inflation Take to Double Costs and Cut the Purchasing Power of $50,000 in Half? $50,000 context amount · 2% annual rate
- How Long Could 2.5% Inflation Take to Double Costs and Cut the Purchasing Power of $50,000 in Half? $50,000 context amount · 2.5% annual rate
- How Long Could 3% Inflation Take to Double Costs and Cut the Purchasing Power of $50,000 in Half? $50,000 context amount · 3% annual rate
- How Long Could 4% Inflation Take to Double Costs and Cut the Purchasing Power of $50,000 in Half? $50,000 context amount · 4% annual rate
- How Long Could 6% Inflation Take to Double Costs and Cut the Purchasing Power of $50,000 in Half? $50,000 context amount · 6% annual rate
Portfolio and Retirement Planning Examples
Apply doubling-time intuition to portfolio growth estimates and retirement-planning assumptions.
- How Long Could a Portfolio of $50,000 Take to Double at 4%? $50,000 context amount · 4% annual rate
- How Long Could a Portfolio of $50,000 Take to Double at 6%? $50,000 context amount · 6% annual rate
- How Long Could a Portfolio of $50,000 Take to Double at 7%? $50,000 context amount · 7% annual rate
- How Long Could a Portfolio of $50,000 Take to Double at 8%? $50,000 context amount · 8% annual rate
- How Long Could a Portfolio of $50,000 Take to Double at 10%? $50,000 context amount · 10% annual rate
- How Long Could a Portfolio of $100,000 Take to Double at 4%? $100,000 context amount · 4% annual rate
- How Long Could a Portfolio of $100,000 Take to Double at 6%? $100,000 context amount · 6% annual rate
- How Long Could a Portfolio of $100,000 Take to Double at 7%? $100,000 context amount · 7% annual rate
- How Long Could a Portfolio of $100,000 Take to Double at 8%? $100,000 context amount · 8% annual rate
- How Long Could a Portfolio of $100,000 Take to Double at 10%? $100,000 context amount · 10% annual rate
- How Long Could a Portfolio of $250,000 Take to Double at 4%? $250,000 context amount · 4% annual rate
- How Long Could a Portfolio of $250,000 Take to Double at 6%? $250,000 context amount · 6% annual rate
- How Long Could a Portfolio of $250,000 Take to Double at 7%? $250,000 context amount · 7% annual rate
- How Long Could a Portfolio of $250,000 Take to Double at 8%? $250,000 context amount · 8% annual rate
- How Long Could a Portfolio of $250,000 Take to Double at 10%? $250,000 context amount · 10% annual rate
- How Long Could a Portfolio of $500,000 Take to Double at 4%? $500,000 context amount · 4% annual rate
- How Long Could a Portfolio of $500,000 Take to Double at 6%? $500,000 context amount · 6% annual rate
- How Long Could a Portfolio of $500,000 Take to Double at 7%? $500,000 context amount · 7% annual rate
- How Long Could a Portfolio of $500,000 Take to Double at 8%? $500,000 context amount · 8% annual rate
- How Long Could a Portfolio of $500,000 Take to Double at 10%? $500,000 context amount · 10% annual rate
- How Long Could a Portfolio of $1,000,000 Take to Double at 4%? $1,000,000 context amount · 4% annual rate
- How Long Could a Portfolio of $1,000,000 Take to Double at 6%? $1,000,000 context amount · 6% annual rate
- How Long Could a Portfolio of $1,000,000 Take to Double at 7%? $1,000,000 context amount · 7% annual rate
- How Long Could a Portfolio of $1,000,000 Take to Double at 8%? $1,000,000 context amount · 8% annual rate
- How Long Could a Portfolio of $1,000,000 Take to Double at 10%? $1,000,000 context amount · 10% annual rate
- In Retirement Planning, How Long Could $100,000 Take to Double at 5%? $100,000 context amount · 5% annual rate
- In Retirement Planning, How Long Could $100,000 Take to Double at 6%? $100,000 context amount · 6% annual rate
- In Retirement Planning, How Long Could $100,000 Take to Double at 7%? $100,000 context amount · 7% annual rate
- In Retirement Planning, How Long Could $100,000 Take to Double at 8%? $100,000 context amount · 8% annual rate
- In Retirement Planning, How Long Could $100,000 Take to Double at 9%? $100,000 context amount · 9% annual rate
- In Retirement Planning, How Long Could $250,000 Take to Double at 5%? $250,000 context amount · 5% annual rate
- In Retirement Planning, How Long Could $250,000 Take to Double at 6%? $250,000 context amount · 6% annual rate
- In Retirement Planning, How Long Could $250,000 Take to Double at 7%? $250,000 context amount · 7% annual rate
- In Retirement Planning, How Long Could $250,000 Take to Double at 8%? $250,000 context amount · 8% annual rate
- In Retirement Planning, How Long Could $250,000 Take to Double at 9%? $250,000 context amount · 9% annual rate
- In Retirement Planning, How Long Could $500,000 Take to Double at 5%? $500,000 context amount · 5% annual rate
- In Retirement Planning, How Long Could $500,000 Take to Double at 6%? $500,000 context amount · 6% annual rate
- In Retirement Planning, How Long Could $500,000 Take to Double at 7%? $500,000 context amount · 7% annual rate
- In Retirement Planning, How Long Could $500,000 Take to Double at 8%? $500,000 context amount · 8% annual rate
- In Retirement Planning, How Long Could $500,000 Take to Double at 9%? $500,000 context amount · 9% annual rate
- In Retirement Planning, How Long Could $750,000 Take to Double at 5%? $750,000 context amount · 5% annual rate
- In Retirement Planning, How Long Could $750,000 Take to Double at 6%? $750,000 context amount · 6% annual rate
- In Retirement Planning, How Long Could $750,000 Take to Double at 7%? $750,000 context amount · 7% annual rate
- In Retirement Planning, How Long Could $750,000 Take to Double at 8%? $750,000 context amount · 8% annual rate
- In Retirement Planning, How Long Could $750,000 Take to Double at 9%? $750,000 context amount · 9% annual rate
- In Retirement Planning, How Long Could $1,000,000 Take to Double at 5%? $1,000,000 context amount · 5% annual rate
- In Retirement Planning, How Long Could $1,000,000 Take to Double at 6%? $1,000,000 context amount · 6% annual rate
- In Retirement Planning, How Long Could $1,000,000 Take to Double at 7%? $1,000,000 context amount · 7% annual rate
- In Retirement Planning, How Long Could $1,000,000 Take to Double at 8%? $1,000,000 context amount · 8% annual rate
- In Retirement Planning, How Long Could $1,000,000 Take to Double at 9%? $1,000,000 context amount · 9% annual rate
Index Fund Return Assumption Examples
See how common index-fund-style return assumptions translate into approximate years-to-double benchmarks.
- How Long Could an Index Fund Balance of $10,000 Take to Double at 6%? $10,000 context amount · 6% annual rate
- How Long Could an Index Fund Balance of $10,000 Take to Double at 7%? $10,000 context amount · 7% annual rate
- How Long Could an Index Fund Balance of $10,000 Take to Double at 8%? $10,000 context amount · 8% annual rate
- How Long Could an Index Fund Balance of $10,000 Take to Double at 9%? $10,000 context amount · 9% annual rate
- How Long Could an Index Fund Balance of $10,000 Take to Double at 10%? $10,000 context amount · 10% annual rate
- How Long Could an Index Fund Balance of $25,000 Take to Double at 6%? $25,000 context amount · 6% annual rate
- How Long Could an Index Fund Balance of $25,000 Take to Double at 7%? $25,000 context amount · 7% annual rate
- How Long Could an Index Fund Balance of $25,000 Take to Double at 8%? $25,000 context amount · 8% annual rate
- How Long Could an Index Fund Balance of $25,000 Take to Double at 9%? $25,000 context amount · 9% annual rate
- How Long Could an Index Fund Balance of $25,000 Take to Double at 10%? $25,000 context amount · 10% annual rate
- How Long Could an Index Fund Balance of $50,000 Take to Double at 6%? $50,000 context amount · 6% annual rate
- How Long Could an Index Fund Balance of $50,000 Take to Double at 7%? $50,000 context amount · 7% annual rate
- How Long Could an Index Fund Balance of $50,000 Take to Double at 8%? $50,000 context amount · 8% annual rate
- How Long Could an Index Fund Balance of $50,000 Take to Double at 9%? $50,000 context amount · 9% annual rate
- How Long Could an Index Fund Balance of $50,000 Take to Double at 10%? $50,000 context amount · 10% annual rate
- How Long Could an Index Fund Balance of $100,000 Take to Double at 6%? $100,000 context amount · 6% annual rate
- How Long Could an Index Fund Balance of $100,000 Take to Double at 7%? $100,000 context amount · 7% annual rate
- How Long Could an Index Fund Balance of $100,000 Take to Double at 8%? $100,000 context amount · 8% annual rate
- How Long Could an Index Fund Balance of $100,000 Take to Double at 9%? $100,000 context amount · 9% annual rate
- How Long Could an Index Fund Balance of $100,000 Take to Double at 10%? $100,000 context amount · 10% annual rate
- How Long Could an Index Fund Balance of $250,000 Take to Double at 6%? $250,000 context amount · 6% annual rate
- How Long Could an Index Fund Balance of $250,000 Take to Double at 7%? $250,000 context amount · 7% annual rate
- How Long Could an Index Fund Balance of $250,000 Take to Double at 8%? $250,000 context amount · 8% annual rate
- How Long Could an Index Fund Balance of $250,000 Take to Double at 9%? $250,000 context amount · 9% annual rate
- How Long Could an Index Fund Balance of $250,000 Take to Double at 10%? $250,000 context amount · 10% annual rate
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