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Calculator Suite

Simple Save vs Invest Calculator

The simplest way to see why investing usually beats saving over the long run. Two sliders, one chart, no jargon.

Last reviewed: · Reviewed by the Money Scale editorial team · How we source our data

New to this? No jargon, no scary toggles. Click any underlined word to learn what it means.

Start Here · No experience needed
What if I just started?
Two ways to grow your money: (a savings account today pays about ) and . This little tool shows the difference.

Even $100 is a great start. Don't worry — this isn't locked in.

Even small amounts grow, thanks to .

Time is your biggest superpower. The longer you let it sit, the bigger the snowball. (We're not adjusting for here — both numbers are in today-style dollars.)

In 20 years, here's what you'd have:

If you save it

$19,450

At ~4% per year · +$6,950 growth

If you invest it

$41,632

At ~10% per year · +$29,132 growth

Investing wins by $22,182

You'd only put in $12,500 of your own money. The rest comes from growth.

Year 0Year 1Year 2Year 3Year 4Year 5Year 6Year 7Year 8Year 9Year 10Year 11Year 12Year 14Year 16Year 18Year 20$0$15,000$30,000$45,000$60,000
  • Saved
  • Invested

The gap between the two lines = the cost of leaving your money in cash.

Additional Resources

From a few of our favorite YouTubers

Want to go deeper without paying anyone? These free creators do a great job explaining the basics. Pick whichever voice clicks for you.

Graham Stephan

Real-estate investor turned YouTuber who breaks down save-vs-invest with real numbers and zero fluff.

▶ How To Invest For Beginners (start with these 3 funds)

Jeff Rose — Wealth Hacker

Ex-Army officer and CFP whose 401(k) and IRA explainers feel like talking to a level-headed older sibling.

▶ 401(k) Explained in Less Than 5 Minutes

Two Cents (PBS)

PBS-produced personal-finance show — short, animated, and wonderfully easy to follow.

▶ Why You Should Invest Right Now (and How)

Humphrey Yang

Ex-financial-advisor turned creator with quick, well-illustrated explainers — great if you like the basics in 60 seconds.

▶ How To Invest For Beginners (Step By Step)

Not sponsored. We just like what they make and you can learn from them for free.

Wait, why such a big difference?

Saving in an HYSA earns about 4% a year. Safe and steady, but slow. Investing in something like the S&P 500 has averaged about 10% a year over many decades. That gap might sound small — but it year after year, so over decades it becomes huge.

The catch: investing goes up and down. Some years it loses money. The people who win are the ones who stay calm, keep adding a little each month, and don't pull out when things look scary.

Want to see the full picture with fees, inflation adjustment, and other investments? Click “Show me the math” at the top of this page.

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Email me my Save vs Invest (Starter) scenario

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The simplest version of the savings-vs-investing question: two sliders (amount + years), one chart. Strip away the fees and inflation toggles and you can still see the gap clearly — investing pulls dramatically ahead of saving over decades. This calculator exists to make the concept stick before you graduate to the advanced version.

Free, private, and no signup

Money Scale is built the opposite way from the big finance sites: the numbers you enter never leave your device, and there's nothing to sign up for.

  • Your numbers stay privateEvery calculation runs in your browser. We never receive or store your salary, balances, or inputs.
  • Always freeNo paywall, no upsell to a calculator that actually works.
  • No login, no emailUse every tool instantly — we never gate results behind a signup.
  • Sourced defaultsStarting rates and assumptions cite real data, not made-up numbers.

How this calculator works

  1. Drag the amount slider to set how much you have.
  2. Drag the years slider to set how long until you'd want the money.
  3. Read the gap. The chart shows savings (a flat-ish line) vs investing (a curve that accelerates).
  4. Ready for more detail? Switch to the advanced 'Savings vs Investing' calculator above for fees, inflation, and contributions.

savings = P × (1 + 4%)^t vs investing = P × (1 + 7%)^t

Two compound-interest curves at the typical real-world rates: ~4% for top high-yield savings, ~7% for diversified stocks (real, after inflation). The gap between them widens dramatically as t grows.

P
Amount you start with
t
Time in years

Frequently asked questions

Savings accounts barely keep up with inflation. Stock index funds have historically returned roughly 7% per year before inflation, compounding into a much larger gap over decades.

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Ready for more?

The detailed calculators include fees, inflation adjustment, multi-debt avalanche-vs-snowball, rent-vs-buy, emergency fund sizing, and more — every assumption sourced.