Free financial calculators that keep your numbers to themselves

Every tool below runs entirely in your browser. No accounts, no ads, no affiliate links, no trackers — there isn't even a server that could see what you type. Plan your money like nobody's watching, because nobody is.

🔓 100% client-side 🚫 No ads or affiliates 📥 Downloadable for offline use 🆓 Free, forever
📈Retirement Calculator

Will your savings last? Project your 401(k)/IRA growth, Social Security, and spending through retirement — with year-by-year detail.

myretirecalc.com
🏛️Federal Retirement (FERS)

For federal employees: FERS annuity, TSP growth, the supplement, sick-leave credit, and your earliest realistic retirement date.

fedretirecalc.com
🏠Mortgage Payoff

What do extra payments really buy you? Amortization, payoff date, and interest saved — biweekly, extra monthly, or lump sums.

mypayoffcalc.com
🎓529 College Savings

Are you on track for college costs? Savings projection, your state's 529 tax break (all 50 states + DC), and 529 vs Trump Account vs brokerage.

my529calc.com
♿ABLE Disability Savings

Tax-free savings for a person with a disability — growth projection, the SSI $100,000 timeline, ABLE-to-Work room, and state tax breaks.

myablecalc.com
✨ More calculators are on the way.
Same rules: free, private, no strings.

Why "private" matters for a financial calculator

Most big-name calculator sites are lead-generation businesses — the calculator is the bait, and your income, savings, and retirement plans are the product. That's why they ask for your email, set trackers, and pass your details to advisors and advertisers.

These tools work differently, and you can verify every claim:

🔍 Nothing to interceptEach calculator is a single page of visible code with no back-end. Your inputs are computed on your own device and saved only in your own browser.
📥 Proof by downloadEvery tool has a "Download this tool" button that saves it as one HTML file. Open it with your Wi-Fi off — it works fully, forever, and makes zero network calls.
🤝 No incentive to steer youNo ads, no affiliate commissions, no products. Nothing here earns money from your decisions, so nothing here nudges them.

The only measurement on these sites is an anonymous, cookieless page-view counter (because I'm curious if anyone uses these) — it can't see anything you type.

🤖 Don't take my word for it — have an AI help you check

Copy this into ChatGPT, Claude, Gemini — whichever you trust — and follow along. It takes about two minutes:

I'm on privatecalcs.com, which hosts free financial calculators (myretirecalc.com, fedretirecalc.com, mypayoffcalc.com, my529calc.com, myablecalc.com). The site claims each calculator runs 100% in my browser and that nothing I type is ever transmitted. Walk me through verifying that myself: (1) how to open my browser's DevTools Network tab and watch for outgoing requests while I type numbers into one of the calculators, (2) what the site's single Cloudflare Web Analytics beacon request contains and why it can't include my inputs, and (3) how to use the "Download this tool" button on a calculator and run the saved file with Wi-Fi off to prove it works with zero network access. Then tell me: what would the Network tab typically show instead on a big-name lead-generation calculator site?