Omni Apy Calculator
A 5% rate compounded monthly and a 5% rate compounded quarterly are not the same deal. Annual Percentage Yield (APY) converts any nominal rate and compounding schedule into one comparable number: the effective yearly return. This calculator finds your APY, projects deposit growth over any number of years, compares all seven compounding frequencies side by side with your choice highlighted, and works backwards from a target APY to the nominal rate you need.
| Compounding | Periods/yr | APY at your rate |
|---|
Quick Answer
At a 5.00% nominal rate compounded monthly, the APY is 5.116%. A $10,000 deposit grows to $16,470.09 over 10 years, earning $6,470.09 in interest. Switch the compounding to daily and the APY rises to 5.127%, worth an extra $16.55 over the decade on this deposit. The calculator is pre-filled with this exact case, including the deposit and years. In reverse, a 6% APY compounded monthly needs a 5.841% nominal rate.
How to use the APY calculator
Start in APY from rate mode: enter the nominal annual rate, pick the compounding schedule, and click Calculate. The tool answers with the APY, a breakdown of what went in, and a live comparison of all seven compounding frequencies for your rate, with your choice highlighted. Add a deposit and years to project growth on top of that. Reset restores the worked-example values. Results stay hidden until you click Calculate.
APY from rate
The nominal rate is the stated rate before compounding, often labeled APR on savings products. The compounding schedule is how often interest joins the balance each year: daily (365), weekly (52), biweekly (26), monthly (12), quarterly (4), semiannual (2), or annual (1). The comparison table shows the APY your rate produces at every one of these, so you can see exactly what more frequent compounding is worth: at 5%, monthly gives 5.116% and daily gives 5.127%, a difference of just 0.011 percentage points. The optional projection compounds a deposit at your rate and schedule over the years you enter, reporting interest earned and final balance separately.
Rate from target APY
Flip the question: enter the APY you want to earn and the compounding schedule your account will use, and the tool solves for the nominal rate required. This is the number to compare against nominal-rate offers such as bonds or loans, similar to running a backward compound calculation on a savings goal.
How APY is calculated
APY answers one question: if money sits untouched for a year and all interest is reinvested, what is the true yearly return? The formula: APY = (1 + r/n)^n - 1, where r is the nominal rate as a decimal and n is the compounding periods per year. For 5% compounded monthly: (1 + 0.05/12)^12 - 1 = 5.116%. The reverse formula solves for the nominal rate: r = n x ((1 + APY)^(1/n) - 1). The projection uses final balance = deposit x (1 + r/n)^(n x years). This is the effective interest rate by another name: APY and EAR describe the same compounding-adjusted yield.
Worked example: 5% nominal, $10,000, 10 years
Pre-filled inputs, verified against the tool. The comparison table is live: it recomputes for whatever rate you enter.
| Compounding | Periods/yr | APY at 5% nominal |
|---|---|---|
| Daily | 365 | 5.127% |
| Weekly | 52 | 5.125% |
| Biweekly | 26 | 5.122% |
| Monthly | 12 | 5.116% |
| Quarterly | 4 | 5.095% |
| Semiannual | 2 | 5.062% |
| Annual | 1 | 5.000% |
Final balance = 10,000 x (1 + 0.05/12)^120 = $16,470.09; interest earned = $6,470.09. Moving from annual to monthly compounding adds about $11.62 per year on $10,000, while moving from daily to continuous compounding would add only cents. The frequency is a tie-breaker; the rate does the real work.
What competing calculators miss
Most APY tools solve one direction: rate in, APY out, on a static page. A couple convert backwards too, and several print static comparison tables, but the combination is what is missing. CalculatorPark has a reverse mode and per-frequency dollar interest, yet no multi-year deposit projection and no way to copy the result. Softonic's tool converts both directions with a static table, but the table never recomputes for your rate. CalcVenue and Calcmate are single-direction tools with explainer depth but no reverse solver. Awajis shows the right formula with static 5% and 10% columns. None combines the reverse solver, a live seven-frequency table that highlights your choice, a deposit projection with years and interest earned, and Copy and Share beside the answer. That combination is this page: enter once, get the APY, see every frequency, project the growth, and take the numbers with you.
APY vs APR, and what APY assumes
APR is the nominal rate before compounding: 5% APR. APY includes compounding: 5.116% APY at monthly compounding. When comparing savings accounts, CDs, or money-market funds, compare APY to APY. A 5.00% APR account compounding monthly beats a 5.05% APR account compounding annually (5.116% vs 5.050% APY). This is why a high-yield savings account that advertises a big APY can still trail a modest APR that compounds more often: run both schedules in the comparison table. Two honest caveats travel with every APY figure. First, APY assumes the balance sits untouched for the full year with every interest payment reinvested at the same rate; it excludes fees, minimum-balance penalties, and tiered rates. Second, for variable-rate accounts the bank can change the nominal rate at any time, which changes the APY; fixed-rate CDs lock the rate for the term. For the day-by-day view of frequent compounding, the daily compounding calculator shows how the balance builds period by period.
Frequently asked questions
No. The interest rate (APR) is the nominal rate before compounding; APY includes the compounding effect. APY is always equal to or higher than the APR for the same account.
Daily, among standard schedules, for any given nominal rate. But the differences are small: at 5%, daily gives 5.127% and monthly gives 5.116%, a gap of 0.011 percentage points. The comparison table above shows all seven for your rate.
Use the Rate from target APY mode: nominal rate = n x ((1 + APY)^(1/n) - 1). For 6% APY compounded monthly, that is 5.841%.
No. APY is a standardized yield measure that excludes account fees, so a high-fee account can advertise an attractive APY while delivering less. Subtract expected fees from the projected interest to get the real picture.
Yes, for variable-rate accounts banks can change the nominal rate at any time, which changes the APY. Fixed-rate CDs lock the rate for the term.
You get the APY and the full seven-frequency comparison table, with no growth projection. Enter a deposit and years to add the projection.
Because accounts advertise APY while loans and bonds quote nominal rates. When an account promises 6% APY with monthly compounding, the solver shows it takes a 5.841% nominal rate, which is the number you compare against a nominal-rate offer.
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References
- Experian. APR vs. APY: What's the Difference? Accessed October 23, 2026.
- Consumer Financial Protection Bureau. Truth in Savings, Regulation DD (12 CFR Part 1030). Accessed October 23, 2026.
- U.S. Securities and Exchange Commission. Certificates of Deposit (CDs) Accessed October 23, 2026.
- Federal Deposit Insurance Corporation. Deposit Insurance. Accessed October 23, 2026.
- U.S. Securities and Exchange Commission, Investor.gov. Compound Interest Calculator. Accessed October 23, 2026.
- U.S. Securities and Exchange Commission, Investor.gov. Saving and Investing. Accessed October 23, 2026.
- Internal Revenue Service. Topic No. 403, Interest Received. Accessed October 23, 2026.
- U.S. Department of the Treasury, TreasuryDirect. Series I Savings Bonds. Accessed October 23, 2026.
- Financial Industry Regulatory Authority. Understanding Savings. Accessed October 23, 2026.
- National Credit Union Administration. Consumer Resources. Accessed October 23, 2026.