How to use the Annuity Calculator
Estimate end balance from starting principal, annual addition, monthly addition with the Annuity Calculator. It includes End balance, Total return/interest earned workflows, so choose the one that matches the values you actually know. Use it as a planning baseline, then compare the estimate with current rates, fees, taxes, and provider terms.
Step by step
- For the Annuity, enter starting principal, annual addition, monthly addition, add at each period's, annual growth rate. Keep each value in the unit displayed beside its field.
- Review the selected Annuity workflow and inputs, then read end balance in the result panel.
- Change one Annuity assumption at a time to compare scenarios. Use Reset to restore this tool's worked example values.
How the calculation works
Compounds principal and beginning- or end-of-period additions monthly.
Worked example
In the Annuity worked example, starting principal $100,000, annual addition $5,000, monthly addition $500, add at each period's End produces end balance of $332,162.41. Starting principal: $100,000.00. Review the displayed units before comparing the result.
Understanding the result
The Annuity reports end balance. Use it as a planning baseline, then compare the estimate with current rates, fees, taxes, and provider terms. Planning estimate only. Rates, fees, taxes, eligibility rules, timing, and provider terms can change the result.
How to check the answer
Check the Annuity result by entering the same starting principal, annual addition, monthly addition in an independent statement, lender, provider, or official tool. Change one input and confirm that end balance moves in the direction implied by Compounds principal and beginning- or end-of-period additions monthly.
Common questions
What does the Annuity calculate?
Estimate end balance from starting principal, annual addition, monthly addition with the Annuity Calculator.
Which Annuity inputs have the biggest effect?
end balance responds directly to starting principal, annual addition, monthly addition, add at each period's, annual growth rate. Change one input while holding the others constant to see its effect.
Is the Annuity result exact?
Planning estimate only. Rates, fees, taxes, eligibility rules, timing, and provider terms can change the result. Recheck starting principal, annual addition, monthly addition and use end balance only for a decision where that level of precision is appropriate.