Future Value Calculator
Calculate the future value of investments with compound interest.
About this tool
The Future Value Calculator helps you determine how much your investment or savings will grow over time by applying compound interest. Whether you're planning for retirement, a major purchase, or building wealth, understanding how money compounds is essential to making informed financial decisions. This tool instantly shows you the end result based on your starting amount, interest rate, and time horizon.
To use the calculator, simply enter your initial investment or savings amount, the annual interest rate (as a percentage), the number of years you plan to invest, and how frequently interest compounds—whether annually, semi-annually, quarterly, monthly, or daily. The tool will calculate your future value automatically, displaying both the final amount and the total interest earned. Common use cases include projecting retirement savings growth, estimating how much a savings account will accumulate, or comparing different investment scenarios.
Compound interest works exponentially, meaning your returns generate their own returns over time. The more frequently interest compounds, the higher your final amount will be. Keep in mind that this calculator assumes a fixed interest rate and regular deposits; real-world investments may fluctuate, and inflation may reduce purchasing power. Use this as a planning tool, not a guarantee—consult a financial advisor for personalized investment advice.
Frequently Asked Questions
Code Implementation
def future_value(pv, rate, periods):
"""Future value of a lump sum (FV = PV * (1+r)^n)."""
return round(pv * ((1 + rate) ** periods), 2)
def future_value_with_contributions(pv, pmt, rate, periods):
"""FV with regular contributions (annuity)."""
fv_lump = pv * ((1 + rate) ** periods)
if rate == 0:
fv_annuity = pmt * periods
else:
fv_annuity = pmt * (((1 + rate) ** periods - 1) / rate)
return round(fv_lump + fv_annuity, 2)
def real_future_value(nominal_fv, inflation_rate, years):
"""Inflation-adjusted (real) future value."""
return round(nominal_fv / ((1 + inflation_rate) ** years), 2)
# Example: $10,000 at 7%/yr for 20 years, adding $200/month
monthly_rate = 0.07 / 12
periods = 20 * 12
fv = future_value_with_contributions(10000, 200, monthly_rate, periods)
print(f"Nominal FV: ${fv:,.2f}")
print(f"Real FV (3% inflation): ${real_future_value(fv, 0.03, 20):,.2f}")Comments & Feedback
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