See how your money grows.
Instant, transparent investing calculators. Find out how much of your final balance comes from what you saved — and how much from growth. Share any result with one link.
Your plan
How often interest is credited to your balance — your monthly contribution stays the same.
Show yearly breakdown
| Year | Contributions | Growth | Balance |
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Eight quick tools, one job: clarity
Every calculator is instant, transparent about its math, and shareable with a link.
Compound Interest
See how your balance grows year by year, and how much of it is growth, not your own money.
Open calculator →Dollar-Cost Averaging
Model steady monthly, biweekly or weekly investing and watch your contributions compound.
Open calculator →DCA vs Lump Sum
Same budget, same time, side by side. See exactly how much one strategy can beat the other.
Open calculator →Rule of 72
How long until your money doubles? The fastest mental shortcut in finance.
Open calculator →Savings Goal
Work backwards from a target amount to the monthly contribution you need.
Open calculator →Investment Return
Work backwards from your final balance to your real annualized return.
Open calculator →Retirement
Project your nest egg and how much you can safely withdraw each month.
Open calculator →Loan Payment
See your equal monthly payment, total interest and total cost of any loan.
Open calculator →Transparent math
Every calculator shows its formula and assumptions. No black boxes.
No sign-up
Open the page and calculate. No accounts, no email walls.
No data stored
Everything runs in your browser. Your numbers never leave your device.
Share anything
Any result becomes a link or a PNG. Send it to friends, Reddit or X.
Learn before you calculate
Short, plain-English explanations of the math behind the tools.
The 3 variables that decide your outcome→ What Happens If You Invest $500 a Month for 10 Years?
Run the numbers on steady monthly investing→ DCA vs Lump Sum: Which Is Better?
What the math says, and what it doesn't capture→ Monthly vs Daily Compound Interest
How much compounding frequency really matters→ How Much to Save Each Month to Reach a Goal
Work backwards from any target to your monthly number→ What's My Real Investment Return?
The honest way to judge how your money actually performed→ How Much Do I Need to Retire?
The two numbers that make a retirement plan→ Understanding Your Loan Payment
Why early payments are mostly interest — and how term changes cost→