How to use a compound interest calculator

1. Enter starting principal.
2. Enter an annual rate you want to model (not a live quote).
3. Enter years (or use year presets).
4. Choose compounding frequency.
5. Optional: add a monthly deposit.
6. Read future value, interest, rate compare table, and year schedule.

Example: $10,000 · 5% · 10 years · monthly

What it is not

• Not investment advice
• Not a market return forecast
• Not fees, taxes, or inflation-adjusted results

How we calculate · Questions

Frequently asked questions

What inputs do I need?

Principal, annual rate %, years, compounding frequency, and optional monthly deposit.

Can I share a prefilled link?

Yes—use principal, rate, years, compounding, and monthly query parameters.

Sources linked above include U.S. government materials (for example CFPB, FDIC, NCUA, BLS, IRS) where noted. Sample math uses only labeled Nestfigure assumptions—not bank quotes, job offers, or personalized advice. Last reviewed: August 9, 2026.