Complete guide
Roth IRA Calculator: formula, worked example and interpretation
Project Roth IRA contributions and investment growth to a selected retirement age. Enter the known values and the result updates instantly with an auditable breakdown.
What the Roth IRA Calculator answers
Project Roth IRA contributions and investment growth to a selected retirement age.
Use the breakdown to compare the result with the source values before making a decision.
Formula and variables
The calculation uses future value=balance growth+annual contribution annuity. Every variable comes directly from a labeled field.
future value=balance growth+annual contribution annuityWorked example
A 30-year-old projects a current balance and annual contributions through age 65.
Changing any field recalculates the result immediately, so nearby scenarios can be compared without reloading the page.
How to use the result
Treat the result as a planning value and compare it with the detailed rows shown beside it.
Keep units and time periods consistent. Use the share or PDF action to preserve the exact assumptions.
Assumptions and scope
Eligibility, contribution limits, five-year rules, taxes and investment returns require current IRS and account-specific review.
The calculator exposes its assumptions instead of filling missing facts with hidden estimates.
Accuracy checks
Confirm the units, dates, rates and source figures before relying on the output.
Round only the displayed answer; Calculator24 keeps full JavaScript precision for intermediate arithmetic and exported values.
Input and output checklist
| Item | What to enter or review |
|---|---|
| Inputs | Current age, Retirement age, Current Roth balance ($), Annual contribution ($), Annual return (%) |
| Equation | future value=balance growth+annual contribution annuity |
| Example | A 30-year-old projects a current balance and annual contributions through age 65. |
| Limit | Eligibility, contribution limits, five-year rules, taxes and investment returns require current IRS and account-specific review. |
Frequently asked questions
What does this Roth IRA Calculator calculate?
Project Roth IRA contributions and investment growth to a selected retirement age.
Which formula does it use?
future value=balance growth+annual contribution annuity
Does the result update while I type?
Yes. Valid changes recalculate after a short delay and the previous result is not substituted for invalid input.
Which assumptions should I check?
Check units, rates, dates and every source value shown in the form.
Is the result exact?
Eligibility, contribution limits, five-year rules, taxes and investment returns require current IRS and account-specific review.
Can I save or share the calculation?
Yes. Copy, Share, WhatsApp, PDF/Print, CSV, comparison and parameterized-link actions are available.
What to keep in mind
Eligibility, contribution limits, five-year rules, taxes and investment returns require current IRS and account-specific review.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.