What's a reasonable expected return for investments?

Historically, the stock market has returned about 7% per year on average. Bonds typically return 3–5%. A mixed portfolio might return 5–6%. Use conservative estimates for planning.

Should I adjust for inflation?

Yes, for long-term planning. Inflation erodes purchasing power—$100 today might buy $50 worth of goods in 20 years at 3% inflation. The inflation toggle shows your future balance in today's dollars.

What's the difference between this and the compound interest calculator?

This calculator is investment-focused with presets (stocks, bonds, mixed), scenario comparison (low/medium/high returns), and inflation adjustment. The compound interest calculator is more general-purpose.

How do regular contributions affect growth?

Each contribution earns returns from the day it's made. Contributing monthly instead of annually means more of your money is invested sooner, earning returns over longer periods.

Is this calculator accurate for real investments?

This calculator assumes a fixed rate of return. Real investments fluctuate—some years you'll gain 20%, others you might lose 10%. Use it for projections and planning, not as a guarantee.

Investment Calculator

Formula & examples

How investment growth works

Your money grows through compound returns: you earn returns on your initial investment and on reinvested gains. Adding regular contributions accelerates growth because each contribution earns returns from the day it's made. The stock market has historically returned about 7% per year on average; bonds about 4%. This calculator projects growth assuming a fixed rate—real investments fluctuate.

Formula

FV = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) − 1) / (r/n)]

With regular contributions, each contribution compounds from when it's made. Inflation adjustment shows your future balance in today's purchasing power.

Example

$10,000 initial + $500/month at 7% for 20 years:

Variable	Value
Initial investment	$10,000
Monthly contribution	$500
Annual return	7%
Years	20
Future value	~$311,000
Total contributions	$120,000
Interest earned	~$181,000

Limitations

Assumes fixed rate; real returns vary year to year.
Does not account for taxes, fees, or market downturns.
Use for planning; past performance doesn't guarantee future results.

Investment Growth, Future Value, and Portfolio Projections

Why Use an Investment Calculator

An investment calculator or investment estimator helps you project how your money will grow over time. Enter a lump sum, regular contributions, expected return, and time horizon to see your projected balance. An investment growth calculator or estimate investment growth tool answers: how much will I have in 10, 20, or 30 years? Use it for retirement planning, wealth building, or any long-term goal. A financial retirement planner or financial planning retirement planner often uses similar projections—this calculator gives you the numbers yourself.

Future Value Calculator and Compound Growth

A future value calculator or future worth calculator shows what a sum of money will be worth after earning returns for a set period. The math is driven by compound annual growth—returns that compound on themselves over time. A compound annual growth calculator or compound growth rate calculator applies the same concept: your money grows exponentially as gains earn gains. This investment calculator projects future value with optional monthly contributions, so you can model both lump-sum and regular investing.

Investment Growth Calculator vs ROI Calculator

An investment growth calculator projects your balance over time. An ROI calculator (or roi calculate tool) measures return on a completed or hypothetical investment as a percentage. Both are useful: use an investment calculator to plan long-term growth; use an ROI calculator to evaluate past performance or compare one-off investments. A stock calculator often does similar projections for equity holdings. To calculate retirement savings, an investment calculator with contributions and inflation adjustment is ideal.

Certificates of Deposit and Savings Bonds

To calculate certificate of deposit growth, use this calculator with a fixed rate (CD rates are typically lower than stocks). Enter your principal, the CD rate, and term. A savings bond calculator works similarly—savings bonds have fixed rates and maturity dates. These are lower-risk, lower-return options; an investment calculator helps you compare them to stock or mixed-portfolio projections. For dividend-focused investing, a calculator dividend tool may factor in yield—this calculator uses total return, which includes dividends reinvested.

Limitations and Next Steps

Investment calculators assume a fixed return—real markets fluctuate. Use conservative estimates for planning. Past performance doesn't guarantee future results. This tool doesn't model taxes, fees, or specific asset allocation. Use it for projections and scenario comparison, then adjust your plan as your situation and goals evolve.