Practical tools for measured work
Compound interest and CD calculator
Project savings using nominal rates or APY, monthly deposits and an explicit compounding convention.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
Savings projection
| Month | Contributed | Interest | Balance |
|---|---|---|---|
| 0 | 1000.00 | 0.00 | 1000.00 |
| 12 | 1000.00 | 50.00 | 1050.00 |
| 24 | 1000.00 | 102.50 | 1102.50 |
How it works
Without deposits, balance = principal × (1 + nominal annual rate/periods)^(periods × years). APY already represents annual compound growth. Monthly deposits are added after each month’s growth, using the equivalent monthly rate. At 5% compounded annually, 1000 becomes 1102.50 after two years.
For a CD, enter the quoted rate convention and set monthly deposits to zero unless the product permits additions. The example 5% is illustrative, not a current bank quote. Check the provider’s dated offer and early-withdrawal terms.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Initial savings
- 1000
- Rate convention
- Nominal annual interest rate
- Entered annual rate
- 5 %
- Compounding frequency
- Annually
- Savings term
- 24 months
- Deposit at each month end
- 0
Primary result: Projected ending balance: 1102.50.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Fixed rate, no fees, tax, withdrawals or inflation. Terms are whole months up to 1200. For partial compounding periods and monthly deposits, this model uses equivalent monthly growth; actual bank day-count and crediting rules may differ. Daily means 365 periods per year. Negative returns above −100% can be modelled, but are not ordinary CD rates.
Frequently asked questions
What should I verify before using this result?
Check the input values, units, dates and assumptions. Compare the method and its stated limits with the source relevant to your task.
Why might the finished result differ?
Results depend on the entered data and the model’s assumptions. Rounding, changing conditions or omitted factors can affect the comparison. Read the limitations before using the result.
Dated CD rate scenarios
Terms from this provider snapshot
| Months | APY | Minimum deposit (USD) | Projected amount (USD) |
|---|---|---|---|
| 6 | 3.95% | 500 | 1019.56 |
| 9 | 4.30% | 500 | 1032.08 |
| 12 | 4.40% | 500 | 1044.00 |
| 18 | 4.40% | 500 | 1066.72 |
| 24 | 4.40% | 500 | 1089.94 |
| 36 | 4.40% | 500 | 1137.89 |
| 48 | 4.40% | 500 | 1187.96 |
| 60 | 4.40% | 500 | 1240.23 |
| 72 | 4.40% | 500 | 1294.80 |
How it works
Marcus by Goldman Sachs
Provider effective date:
Source checked on:
These are dated standard High-Yield CD quotes from one US provider. They are not a live feed, a market-wide comparison or a recommendation. Verify the provider’s current rates and eligibility before making a decision. Promotional, no-penalty and rate-bump products are excluded.
The projection uses APY as an effective annual yield: deposit × (1 + APY / 100)^(months / 12), with no extra deposits. A USD 1000 deposit at 4.40% APY for 12 months projects to USD 1044.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Scenario deposit
- 1000 USD
- Published term
- 12 Months
Primary result: Snapshot APY: 4.40 %.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Enter at least the selected offer’s minimum deposit. Rates may change before opening and funding. Early withdrawal penalties apply. Projections exclude tax, fees and withdrawals; actual day-count and crediting rules may differ. Different terms lock money away for different periods, so maturity amounts alone are not a ranking.
Frequently asked questions
What should I verify before using this result?
Check the input values, units, dates and assumptions. Compare the method and its stated limits with the source relevant to your task.
Why might the finished result differ?
Results depend on the entered data and the model’s assumptions. Rounding, changing conditions or omitted factors can affect the comparison. Read the limitations before using the result.
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