Retirement Planning Calculators
Time is the most powerful factor in retirement planning. Starting 10 years earlier can double your ending balance even at the same contribution rate. These tools help you project growth, compare account types, and set realistic goals.
Guide maintained by Ahmet Ozdemir. Numbarn reviews calculator formulas against reference cases and edits explanatory copy for clarity and limitations. We do not claim third-party professional certification on every page. Last expanded July 2026.
How to use this guide
- Capture the full employer match in your 401(k) before optimizing elsewhere.
- Project account growth with conservative and baseline returns.
- Compare Roth vs traditional using today’s tax rate vs an estimated retirement rate.
- Translate balances into a withdrawal or years-of-runway view.
- Layer a Social Security estimate last so investments are not asked to do every job.
- 1
Retirement Projection
Ballpark your savings at retirement with inflation-adjusted values and withdrawal estimates.
- 2
401(k) Growth
Factor in employer match, contribution limits, and projected returns.
- 3
Roth IRA
Project tax-free growth, check income limits, and see qualified withdrawal status.
- 4
Compound Interest
See the raw power of compounding over any time horizon.
- 5
Investment Growth
General-purpose investment projection with regular contributions.
- 6
Savings Goal
How much do you need to save each month to hit a target?
- 7
Social Security Estimate
Rough estimate of Social Security benefits at different claiming ages.
Example scenarios
Age 32, first match available
Contribute enough for the match, then model raising deferrals by 1% each raise. Compare Roth vs traditional if your plan offers both.
Age 50 catch-up
Use catch-up contribution room, run a late-start retirement projection, and test retiring 2–3 years later as an alternative to aggressive returns.
Common mistakes to avoid
- Starting contributions too late and underestimating compounding time.
- Ignoring inflation-adjusted purchasing power in final balance estimates.
- Assuming one fixed return and never stress-testing lower-return scenarios.
Decision checklist
- Does the plan still work at a lower return assumption?
- Are fees high enough to outweigh a slightly higher assumed return?
- Have I checked contribution limits for the current plan year?
Frequently asked questions
Should I prioritize 401(k) or Roth IRA first?+
Capture employer match first, then compare Roth IRA flexibility and tax treatment against additional 401(k) contributions.
How should I use these retirement calculators together?+
Use compound interest for intuition, then 401(k)/Roth for account-specific planning, and retirement projection for withdrawal context.
What to do next
- Save at least two scenarios while testing assumptions.
- Compare scenarios in /saved/compare before deciding.
- Use source links and category disclaimers for final verification steps.