Comcast (CMCSA) Investment Calculator
What-If you invested in Comcast? Compare its historical return with savings over any period
Calculator inputs
Set a savings rate once to compare against your investment
| Investment | Allocation | Starting Value | Final Value |
|---|---|---|---|
| 100% |
Savings Account
- Interest Return
- Interest Earned
- Investment Duration
- Annual Interest Rate
Stock
- Market Return
- Market Earned
- Investment Duration
- Annualized Market Return
Savings vs Stock: Comparison
The Gap
Stock Growth Over Time
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The Basics: Savings Accounts vs. Individual Stocks
Buying a share of stock means buying a small ownership stake in a single company -- unlike a diversified ETF, its performance is tied entirely to that one company. A savings account is a bank deposit that pays interest and is typically government-insured, making it one of the lowest-risk places to hold cash, though with far more limited growth potential than an individual stock.
Savings vs. Stock Investing: The Core Trade-Off
A savings account trades higher potential returns for stability and same-day access to your money. An individual stock trades that stability for the potential of much larger long-term gains, along with meaningfully higher volatility and company-specific risk than a savings account or even a diversified ETF carries. The right choice depends on your time horizon, how soon you may need the money, and how comfortable you are with a single company driving your results.
Which One Fits You?
A savings account tends to make more sense for money you may need on short notice -- an emergency fund, a near-term expense, or any goal where a sharp drop in a single stock right before you need the cash would be a real problem. A savings account generally offers greater stability, while an individual stock can experience much larger gains and losses. The appropriate choice depends on factors such as time horizon, liquidity needs, financial goals, and tolerance for company-specific risk.
Concentration Risk: Why One Stock Is Different From an ETF
An ETF spreads your investment across many companies, so a single company's bad quarter has a limited effect on the fund overall. A single stock has no such cushion: its price reflects that one company's earnings, leadership, competition, and industry trends directly. This is the central trade-off of individual stock investing: the same concentration that can produce outsized gains can also produce outsized losses.
Historical Performance Context
Over long stretches of history, some individual stocks have significantly outperformed savings accounts and even broad-market indexes on an average annual basis, while others have underperformed or lost significant value. Past performance over any historical window, including the one you selected above, does not predict future results, and shorter windows in particular can show savings outperforming a stock or vice versa purely due to timing.
Important Investment Risks
Unlike a savings account, money invested in an individual stock is not insured and can lose substantial value, including the possibility of losing most or all of your principal if the company performs poorly. The calculations on this page use historical adjusted closing prices, which already reflect reinvested dividends, and exclude trading fees, taxes, and any recurring contributions, so real-world brokerage results will differ. This tool is for educational purposes only and is not personalized financial, investment, or tax advice.
It depends on your financial circumstances, time horizon, liquidity needs, and risk tolerance. Savings generally offers greater stability, while individual stocks can experience substantially larger gains and losses. This calculator lets you compare how each performed over the historical period you choose.
No. Individual stocks carry meaningfully more risk than a savings account or a diversified ETF, and there is no guarantee any specific stock will outperform over any given period. A single company's stock can also decline sharply or lose most of its value, which a savings account cannot do.
Yes. The investing side of the calculation uses actual historical adjusted closing prices for whichever stock you select above, for the exact start and end dates you choose. 'Closing price' refers to the officially reported price of a security at the close of regular trading on its primary exchange (4:00 PM Eastern Time for U.S. markets), and does not reflect after-hours or extended-trading activity.
U.S. stock markets are closed on Saturdays and Sundays, so no closing price exists for those days. The calculator requires a business day (Monday through Friday) so the stock comparison can use a real, recorded closing price.
This calculator uses historical adjusted closing prices, so dividends and dividend reinvestment are already reflected in the price for stocks that pay them. It does not include trading fees or taxes.
Generally, yes. An ETF spreads your money across many companies, which smooths out the effect of any single company's bad news. A single stock has no such diversification, so its price can move much more sharply in either direction based on that one company's performance.
Savings growth is calculated using annual compound interest with the formula Final Value = Principal × (1 + Rate)^Years, where Years is the exact time span between your selected start and end dates. The investing CAGR, or compound annual growth rate, is calculated the same way but solved in reverse: CAGR equals the Final Value divided by the Principal, raised to the power of one divided by Years, minus 1. This puts both sides on the same annualized basis for an easy comparison.
Toggling this sets the comparison side to 0% growth, representing literal idle cash instead of a savings account earning interest -- useful if you want to see the raw effect of investing versus doing nothing with the money.
Pages for a single ticker, such as /stocks/aapl/, default to showing performance since January 1, 2020, so you can see a meaningful multi-year track record right away. For stocks that started trading more recently -- recent IPOs or newly spun-off companies -- the page instead starts from that company's actual first trading day, since 2020 data would not exist for them. You can always change the start and end dates yourself to see any other period.
This stock calculator is provided for educational purposes only and does not constitute financial, investment, or tax advice. Returns shown are based on the historical closing-price performance of the selected stock and do not reflect dividends, trading fees, or taxes. Historical performance does not guarantee future results.