Compound interest means growth builds on earlier growth when interest is added to the balance and itself earns interest later.
Core idea
With discrete compounding: A = P(1 + r/n)^(n·t). Continuous compounding uses A = P·e^(r·t).
Sample
$10,000.00 · 5% · 10 years · monthly → about $16,470.09. Open sample
Related
Frequently asked questions
What is compound interest in plain words?
You earn interest on the original amount and on interest already added, so the balance can grow faster than simple interest at the same rate.
How much is $10,000 at 5% for 10 years (sample)?
About $16,470.09 with monthly compounding under Nestfigure’s model.
Related tool
Estimate growth with free math
Principal, rate, years, compounding, optional deposits.
Open compound interest calculatorSources 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.