Enter your principal amount, annual interest rate, and investment duration to see exactly how your money grows with daily compound interest. The Daily Compound Interest Calculator returns your total balance, total interest earned, and a year-by-year breakdown — so you can watch compounding work in real time.
Final Balance
--
Total Interest Earned
--
Total Contributions
--
Effective Daily Rate
--
Daily compound interest means your interest is calculated and added to your principal every single day. Each day's interest is based on the previous day's total balance — including all previously earned interest — so your money grows faster than with monthly or annual compounding.
The standard formula is A = P × (1 + r/365)^(365×t), where A is the final amount, P is the principal, r is the annual interest rate (as a decimal), and t is the time in years. If you make regular contributions, those are added into the compounding cycle each period.
Daily compounding applies interest 365 times per year instead of 12 (monthly) or once (annually). This means interest starts earning on your interest sooner, resulting in a slightly higher effective yield over time. The difference becomes more significant with larger balances and longer time horizons.
The daily reinvest rate is the percentage of your daily interest earnings that you choose to keep invested for future compounding. For example, a reinvest rate of 80% means you compound 80% of each day's interest and effectively withdraw the other 20%. Setting it to 100% means all earnings are reinvested.
Yes — many high-yield savings accounts, money market accounts, and certificates of deposit compound interest daily. While the APY (Annual Percentage Yield) reflects the effect of daily compounding, checking the compounding frequency in your account terms confirms whether it applies.
Adding regular contributions significantly amplifies the power of daily compounding. Each new deposit immediately begins earning compounded interest, so even modest monthly additions can substantially increase your final balance over a long investment horizon.
It depends on your investment type. High-yield savings accounts currently offer around 4–5%, while long-term stock market index funds have historically averaged 7–10% annually. For day trading or crypto, rates vary wildly and are much harder to predict.
Yes — this calculator works for any investment where daily compounding applies. Traders sometimes use it to project potential growth from daily returns on forex, crypto, or other instruments. Just keep in mind that real-world returns fluctuate and are not guaranteed.