Trust & methodology

About Nestfigure

Transparent math. Personal finance education. Estimates—not advice or bank quotes.

YMYL: Nestfigure publishes educational calculators and explainers about personal finance topics. We are not a bank, credit union, broker-dealer, investment adviser, or tax preparer. Nothing on this site is personalized financial, tax, or investment advice.

What we build

Nestfigure focuses on personal finance calculators and related guides (starting with certificates of deposit). We stay in one niche so explanations and tools can stay consistent. Future tools may include paycheck, raise, overtime, and debt payoff calculators—still educational estimators.

Who authors this content

Content is published by Nestfigure (organization). We do not invent named “expert” authors or fabricated credentials. Report factual errors to info@nestfigure.com.

CD calculator methodology

The CD calculator estimates maturity value using standard compound-interest formulas for education. U.S. deposit products must follow Truth in Savings disclosures (Regulation DD / 12 CFR Part 1030) when offered by covered institutions; our tool does not replace those disclosures.

Discrete compounding

A = P × (1 + r/n)^(n×t)

  • P — principal
  • r — annual nominal rate (decimal)
  • n — periods per year (365 daily, 12 monthly, 4 quarterly, 2 semi-annual, 1 annual)
  • t — years (term months ÷ 12)

Continuous compounding

A = P × e^(r×t)

Continuous compounding is the mathematical limit of more frequent discrete compounding. It is included for completeness; many retail CDs use discrete schedules.

APY input conversion

When you enter APY, we convert it to a nominal rate consistent with the selected compounding choice so that, under this model, a one-year horizon matches the entered APY:

  • Discrete: r = n × ((1 + APY)^(1/n) − 1)
  • Continuous: r = ln(1 + APY)

Example: at 4.50% APY for one year with no fees, $10,000 grows by $450 to $10,450 under a pure 4.50% effective annual yield. That is arithmetic under stated assumptions—not a claim about any bank’s current rates.

Optional monthly deposits

If you add a monthly deposit, we simulate month-by-month growth then add the deposit. Many traditional CDs do not allow add-on deposits; treat this mode as a planning illustration only.

What we intentionally omit

  • Early withdrawal penalties
  • Promotional or step-up rates
  • Account fees and minimums
  • Tax withholding or tax advice
  • Issuer-specific day-count rules

Guides

Primary external references we rely on

Contact

Email: info@nestfigure.com for questions, corrections, or feedback about Nestfigure calculators and guides.

Last reviewed: July 17, 2026.