Future Value Calculator: Purchasing Power & Growth Model (2026)
Calculate future value with inflation and tax adjustments. How to calculate FV formula; see real purchasing power over time. Trusted by investors and planners. No sign-upโall calculations run locally.
Understanding Nominal vs. Real Future Value
The Inflation Erosion Effect
- Nominal Future Value:The dollar amount you'll have in the future (e.g., $1,000,000)
- Real Future Value:Purchasing power adjusted for inflation (e.g., $610,000 in today's dollars)
- Inflation Gap:The difference between nominal and real valueโrepresents lost purchasing power
- Formula:
Inflation silently erodes purchasing power over time. A million dollars in 20 years may only have the purchasing power of $610,000 today at 2.5% inflation.
To truly grow wealth, your returns must outpace inflation. A 7% return with 2.5% inflation means 4.4% real growth.
Tax Impact on Future Value
- Capital Gains Tax:Typically 15% for long-term investments, but can be 0%, 15%, or 20% depending on income
- Tax Bite:The amount of gains lost to taxes (e.g., $100,000 gains ร 15% = $15,000 tax)
- After-Tax Value:Your net wealth after accounting for taxes on gains
- Tax-Advantaged Accounts:Roth IRA (tax-free growth), 401k (tax-deferred), HSA (triple tax advantage)
Taxes reduce your net wealth by applying your tax rate to investment gains. Understanding the tax bite helps you plan for tax-advantaged accounts.
Compounding Frequency and Payment Timing
How Compounding Frequency Affects Growth
- Monthly Compounding:Interest calculated 12 times per year. Common for most investment accounts.
- Quarterly Compounding:Interest calculated 4 times per year. Less frequent but still effective.
- Annual Compounding:Interest calculated once per year. Simplest but lowest effective yield.
- Continuous Compounding:Theoretical maximum using e^(rt). Shows upper limit of growth potential.
More frequent compounding means interest earns interest sooner, leading to higher effective yields.
Monthly compounding typically adds 0.2-0.3% to effective yield compared to annual compounding over long periods.
Beginning vs. End of Period Payments
- End of Period:Payments made at the end of each period. Most common for investment accounts.
- Beginning of Period:Payments made at the start of each period. Earns interest for the entire period.
- Impact:Beginning payments typically add 0.5-1% to final balance over long time horizons.
Payment timing affects when your contributions start earning interest.
Compound Velocity and Wealth Building
Understanding Compound Velocity
- High Velocity (70%+):Most wealth came from compounding. Time and consistent investing created the majority of your wealth.
- Medium Velocity (40-70%):Balanced between contributions and gains. Good progress toward wealth building.
- Low Velocity (<40%):Most wealth came from contributions. Need more time or higher returns to maximize compounding.
Compound Velocity shows what percentage of your final wealth came from investment gains versus your contributions.
Compound Velocity increases with time. The longer you invest, the more your wealth comes from gains rather than contributions.
Real Return Rate Strategy
- Positive Real Return:You're beating inflation and creating true wealth. Goal: 2%+ real return.
- Near-Zero Real Return:Barely keeping pace with inflation. Consider higher-return investments.
- Negative Real Return:Losing purchasing power. Your investment strategy needs adjustment.
- Formula:
Focus on real returns (after inflation) to understand true wealth growth.
Future Value Calculator FAQ
? What is the difference between Nominal Future Value and Real Future Value?
Nominal Future Value is the dollar amount you'll have in the future without adjusting for inflation. Real Future Value (also called inflation-adjusted or purchasing power) shows what that amount is worth in today's dollars. For example, $1 million in 20 years with 2.5% inflation has a real value of only about $610,000 in today's purchasing power. The Inflation Gap represents the purchasing power lost to inflation over time.
? How does compounding frequency affect my future value?
More frequent compounding increases your final balance because interest earns interest sooner. Monthly compounding typically yields 0.2-0.3% more than annual compounding over long periods. Continuous compounding represents the theoretical maximum, using the formula A = Pe^(rt). For most practical purposes, monthly compounding provides an excellent balance between simplicity and growth. The difference becomes more significant with larger principal amounts and longer time horizons.
? What is the impact of taxes on my future value?
Taxes reduce your net wealth by applying your tax rate to investment gains. At a 15% capital gains rate, if you earn $100,000 in gains, you'll pay $15,000 in taxes, leaving $85,000. This is why tax-advantaged accounts (Roth IRA, 401k) are so valuableโthey eliminate or defer taxes, allowing your full gains to compound. The calculator shows both pre-tax and after-tax future values so you can see the real impact of taxes on your wealth accumulation.
? How do I know if my investment is beating inflation?
Compare your Real Return Rate to zero. If it's positive, you're beating inflation. If it's negative, you're losing purchasing power even as your account balance grows. The Real Return Rate is calculated as: ((1 + Return Rate) / (1 + Inflation Rate) - 1) ร 100. For example, a 7% return with 2.5% inflation gives a 4.4% real return. Your investment needs to outpace inflation to create true wealth.
? What is "Compound Velocity" and why does it matter?
Compound Velocity is the percentage of your final wealth that comes from "money that worked for you" (interest/gains) versus "money you worked for" (your contributions). A high compound velocity (e.g., 70%+) means most of your wealth came from compounding, not just your deposits. This is the power of time and consistent investingโover decades, compound interest can generate more wealth than your total contributions.
? Should I make payments at the beginning or end of the period?
Beginning of period payments earn interest for the entire period, while end of period payments earn interest starting the next period. Beginning payments typically add 0.5-1% to your final balance over long time horizons. However, most investment accounts automatically process contributions at the end of the period. The difference is most significant with larger monthly contributions and longer time horizons.