Free for bloggers, newsletters, and news sites. Pick a calculator, copy the snippet, paste it into your post — a fully working calculator appears, sized automatically. The only price: keep the small attribution link.
Compound Interest Calculator
See how your money grows with compound returns.
FIRE Calculator
Find your FI number and years until work is optional.
Coast FIRE Calculator
Find the age you can stop saving and still retire.
Retirement & 4% Rule Calculator
Project your nest egg and test the 4% rule.
Debt Payoff Calculator
Avalanche vs snowball payoff plans, side by side.
Mortgage vs. Invest Calculator
Prepay the mortgage or invest the difference?
Mortgage Payment Calculator
Monthly payment plus full amortization schedule.
Rent vs Buy Calculator
The true cost of buying vs renting, with breakeven year.
SIP Calculator
Project monthly SIP investments in Indian markets.
HSA Calculator
See the HSA triple tax advantage in dollars.
Take-Home Pay Calculator (2026)
Estimate 2026 take-home pay after federal taxes.
Roth vs Traditional Calculator
Roth vs Traditional: compare after-tax outcomes.
Monte Carlo Retirement Simulator
Run 1,000 market scenarios on your retirement plan.
EPF Calculator
Project EPF growth for Indian salaried employees.
PPF Calculator
Project Public Provident Fund deposits and interest.
NPS Calculator
Project NPS Tier I corpus and pension income.
Old vs New Tax Regime — India FY 2026-27
Compare India old vs new tax regime for FY 2026-27.
RSU & ESPP Calculator
RSU vesting schedule with taxes, plus ESPP math.
College Savings Calculator
Will your 529 cover future tuition costs?
What should I do with my money?
8-question wizard: exactly where each dollar goes.
How it works
Paste the snippet where you want the calculator. It lazy-loads (no hit to your page speed), auto-resizes as readers use it, and works on mobile. One snippet per calculator — include the <script> listener once per page even if you embed several.
FAQ
Is it really free to embed these calculators?
Yes — completely free, for blogs, newsletters, and news sites. The only ask is that you keep the small “Powered by Compound Toolbox” attribution link at the bottom of the calculator. That link is what keeps them free.
Can I remove the attribution link?
Please don’t. The attribution link is the entire price of using these calculators — it’s how other readers discover them. Removing it violates the spirit (and the point) of the free embed.
Will the embed slow down my site?
No. The snippet lazy-loads the calculator only when a reader scrolls near it, and the iframe auto-resizes so there’s no wasted space or layout shift.
Does it work on mobile?
Yes. Every calculator is fully responsive — the embed reflows to phone screens automatically, and the iframe height adjusts as readers interact with it.