CD Calculator

CD Calculator is a free, browser-based certificate of deposit interest calculator that instantly computes maturity value, total interest earned, and effective annual yield from your initial deposit, APY, term length, and compounding frequency.

What is CD Calculator?

CD Calculator is a standalone web tool that runs entirely in your browser with no signup or data storage. You input your initial deposit (principal), APY or APR rate, term in months (including partial months), compounding frequency (daily, monthly, quarterly, semiannual, annual), and interest payout method (reinvest/compound or withdraw/simple). It outputs the maturity value, total interest, effective annual yield, and an optional full amortization schedule. The calculator also supports after-tax estimates and includes a separate early withdrawal penalty calculator and a CD ladder calculator.

Key Features

• Multiple compounding frequencies — Supports daily, monthly, quarterly, semiannual, and annual compounding to match bank statements exactly.
• APY or APR input — Choose APY (includes compounding) or APR, with automatic conversion.
• Instant results — Maturity value, total interest, and effective annual yield update as you type.
• Detailed schedule — View a period-by-period accrual schedule to see interest earned over time.
• After-tax estimate — Enter your tax rate to see a simple post-tax snapshot.
• No signup or data collection — All calculations happen client-side; no personal information is stored or transmitted.
• Mobile-friendly design — Clean interface optimized for small screens and touch.
• Bank-compatible — Works with terms and frequencies used by Chase, Wells Fargo, Navy Federal, Bank of America, Citibank, and others.

Who is it for?

• Savers comparing CD offers — Quickly test different APY rates and terms from multiple banks side by side.
• Investors planning fixed-term deposits — Estimate returns before committing funds for 3, 6, 12, 18, or 24+ months.
• Individuals considering early withdrawal — Use the built-in early withdrawal penalty calculator to decide whether cashing out early is worthwhile.
• Bank shoppers — Verify the maturity value quoted by a bank by entering the exact APY and compounding frequency.

What can you do with it?

• Compare compounding frequencies — See how daily compounding yields slightly more than monthly for the same APY and term.
• Estimate after-tax returns — Input your marginal tax rate to see net interest after taxes.
• Plan a CD ladder — Use the CD ladder calculator to structure multiple CDs with staggered maturities for liquidity and higher average yield.
• Evaluate early withdrawal penalties — The penalty calculator estimates lost interest and the break-even APY for switching to a new CD.

How does it work?

1. Enter your principal, APY, term (months), and compounding frequency.
2. Choose interest payout: reinvest (compound) or withdraw (simple interest).
3. Click Calculate or watch results update instantly.
4. Review maturity value, total interest, and effective annual yield.
5. Optionally view the full accrual schedule or apply an after-tax estimate.

The calculator uses the formula ( M = P \times (1 + r)^n ), where ( r = (1 + \text{APY})^{1/\text{periods per year}} - 1 ) and ( n = \text{term in years} \times \text{periods per year} ). Fractional months are handled with fractional periods.

Pricing

CD Calculator is completely free to use with no ads, no signup, and no hidden costs.

FAQ

Is CD Calculator free?

Yes, it is 100% free with no signup required and no ads.

Does it store my data?

No. All calculations run in your browser and are not sent to any server. Your inputs are never stored.

Can I use it for partial-year terms?

Yes. Enter any number of months (e.g., 7 or 15) and the calculator prorates interest using fractional periods.

Does it support daily compounding?

Yes. Daily, monthly, quarterly, semiannual, and annual compounding are all supported.

Is this financial advice?

No. Results are estimates for informational purposes only. Consult a qualified financial advisor for personal advice.

Website: https://mycdcalc.com/