How to Calculate Percentage Growth Rate for Investments and Net Worth

The Difference Between Growth Rate and a Balance Change

Your brokerage account grew from $180,000 to $247,000. That is a $67,000 increase. Most people stop the analysis there.

That number tells you nothing useful on its own.

Did that growth happen over 18 months or over 9 years? Was it driven by contributions or by compounding returns? How does it compare to the S&P 500 over the same period? Without a precise growth rate tied to a time horizon, you cannot answer any of those questions.

Percentage growth rate is the ratio of change relative to a starting value, expressed as a percentage. Annualized growth rate, specifically CAGR, converts that ratio into a per-year figure that holds across any holding period.

Both numbers are necessary. Neither replaces the other.

The Core Formula: Simple Percentage Growth

Simple percentage growth answers one question: how much did a value change relative to where it started?

Formula: (End Value - Begin Value) / Begin Value x 100

This is the correct tool for single-period comparisons. Monthly performance, quarterly net worth snapshots, and year-over-year comparisons all belong here.

Worked Example 1: Annual Net Worth Growth

You ended 2023 with a net worth of $412,000. You ended 2024 with $489,500.

(489,500 - 412,000) / 412,000 x 100 = 18.81%

That is your single-year growth rate. It accounts for every input: investment returns, savings contributions, debt paydown, and asset appreciation. For a 12-month window, this figure is precise and directly comparable to any other 12-month figure.

The mistake occurs when investors apply this same formula to a five-year holding period and then compare the result to an annualized benchmark like the S&P 500's average annual return of approximately 10.5%.

A 94% total return over 5 years looks impressive against a 10.5% annual benchmark. But the annualized equivalent of that 94% total return is only 14.2% per year, a real but more modest outperformance. When that same 94% return occurred over 9 years, the annualized rate drops to 7.7%, which is below the long-run index average.

The raw percentage hides the timeline. CAGR surfaces it.

CAGR: The Only Honest Measure for Multi-Year Returns

Compound Annual Growth Rate calculates the single constant annual return that would transform your beginning value into your ending value over a defined number of years.

Formula: (End Value / Begin Value) ^ (1 / Years) - 1

The result is a percentage. Multiply by 100 to express it clearly.

This formula assumes reinvestment of all gains at a constant rate. Real portfolios do not behave this way. But CAGR creates a standardized metric that allows direct comparison between a real estate investment, a stock portfolio, a private equity position, and an index fund, regardless of how wildly each one oscillated during the holding period.

Worked Example 2: Investment Portfolio CAGR Over 7 Years

You invested $125,000 in January 2018. By January 2025, that portfolio had grown to $241,300 with no additional contributions.

(241,300 / 125,000) ^ (1 / 7) - 1 = 9.79% per year

The S&P 500's CAGR over the same January 2018 to January 2025 period came in at approximately 12.1%, including dividends reinvested. Your portfolio delivered 9.79% annualized against a benchmark of 12.1%. That is a 231-basis-point annual underperformance.

Over 7 years on a $125,000 starting base, 231 basis points of annual underperformance compounds to a gap of approximately $27,400 in ending value. That is the real cost of an inefficient allocation strategy, expressed in dollars rather than abstract percentages.

Without CAGR, you see a 93% total return and feel satisfied. With CAGR, you see a benchmark gap that cost you over $27,000.

How to Apply Growth Rate Analysis to Net Worth Tracking

Net worth growth rate is more complex than investment return. The inputs include earned income, savings rate, debt changes, and asset appreciation across multiple categories. But the calculation structure is identical.

Step 1: Establish Clean Starting and Ending Values

Pull a full net worth snapshot at the beginning and end of your measurement period. Include all assets at current market value and all liabilities at outstanding balance. Do not use cost basis for assets. Use fair market value.

Step 2: Choose the Right Formula

Single year: use simple percentage growth.

Multiple years: use CAGR.

Step 3: Decompose the Growth

CAGR tells you the rate. It does not tell you the source. A net worth CAGR of 14% driven entirely by savings contributions is categorically different from 14% driven by investment compounding. The first is fragile. It stops the moment income stops. The second continues regardless of your paycheck.

Separate your net worth change into three buckets:

1. Net new savings: total contributions to investment accounts, minus debt principal payments made, plus any windfall additions.
2. Market appreciation: investment account growth from returns alone, not from new contributions.
3. Real asset appreciation: primary residence and other property at market value, minus cost basis adjustments.

Run the CAGR formula on each bucket independently. The portfolio bucket CAGR is your true investment performance number.

Common Calculation Errors That Distort the Picture

Averaging Annual Returns Instead of Compounding Them

An investment returns 30% in Year 1 and loses 23% in Year 2. The arithmetic average is 3.5% per year. The actual CAGR is -0.5% per year.

If you started with $100,000, arithmetic averaging suggests you ended with approximately $107,000. The actual ending value is $100,100, before fees.

Arithmetic averages of annual returns always overstate actual compounded performance when volatility exists. The larger the swings, the larger the distortion.

Using the Wrong Time Unit

CAGR requires the time input in years. An 18-month holding period is 1.5 years, not 18. A 30-month holding period is 2.5 years. Plugging month counts into the exponent produces growth rates that are mathematically incorrect and cannot be compared to any standard benchmark.

Ignoring Contributions and Withdrawals

If you added $24,000 to a $200,000 portfolio during the year and the ending value is $238,000, your investment return was not 19%. You contributed $24,000 and gained $14,000 from market performance. The return on the invested capital is closer to 6.5% to 7%, depending on when during the year those contributions arrived.

For portfolios with ongoing contributions or withdrawals, the correct measure is Money-Weighted Return (also called Internal Rate of Return). CAGR remains valid only when measuring a lump-sum investment with no cash flows in or out during the holding period.

What a Realistic Growth Rate Target Looks Like

For context, here are the long-run annualized returns for major asset classes, based on data through 2024:

• U.S. large-cap equities (S&P 500): approximately 10.5% nominal, 7.5% real (after inflation)
• U.S. bonds (Bloomberg Aggregate): approximately 4.6% nominal
• Real estate (NCREIF index): approximately 8.1% nominal
• Cash equivalents (T-bills): approximately 3.3% nominal

A diversified 60/40 portfolio has historically delivered approximately 8.5% to 9.0% nominal CAGR over 20-year rolling periods. That is the baseline any wealth-building strategy should clear before claiming success.

Net worth CAGR targets depend heavily on your wealth level, savings rate, and time horizon. A household in accumulation phase with a high savings rate might legitimately see 15% to 20% net worth CAGR for a decade. That number is driven by savings, not investment genius. As the base grows, the savings contribution shrinks as a percentage of total net worth, and investment return becomes the dominant driver.

Run These Numbers on Your Own Portfolio

The formulas above are not difficult. But running them manually for multiple accounts, across different time periods, while stripping out contributions, is time-consuming and error-prone.

The CalcMoney investment calculator handles the computation automatically. Input your beginning value, ending value, time period, and any ongoing contributions. The tool outputs simple growth rate, CAGR, and the contribution-adjusted return separately, so you see exactly what your money actually did versus what you added to it.

If your portfolio has delivered 11% CAGR over the past decade while holding 30% in cash equivalents, you need to know that. The market returned roughly 12.7% annualized over the same period. That gap, compounded on a seven-figure base, is not abstract. It is a number with a dollar sign in front of it.

Use the calculator. Know the number.

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Results are estimates for informational purposes only. Consult a licensed financial professional before making financial decisions.