Retirement Savings Calculator — fast, private, no signup
Plan U.S. retirement with Social Security timing, SECURE 2.0 RMD rules, Monte Carlo success testing, and instant PDF/CSV exports — all client-side.
Inputs
Results
↔ Scroll horizontally to view all columns
| Year | Age | Start Bal | Return | Contrib | SS | Withdraw | RMD | End Bal |
|---|
🧮 Retirement Savings Calculator — how it works
Plan whether your U.S. retirement savings can sustain your lifestyle from retirement to your target end age, using assumptions aligned with U.S. tax rules, Social Security, and IRS RMD regulations.
🇺🇸 Who this calculator is for
- U.S. residents planning retirement using 401(k), IRA, Roth IRA, or taxable accounts
- Workers estimating Social Security benefits and optimal claiming age
- Retirees needing to model IRS Required Minimum Distributions (RMDs)
- Anyone stress-testing retirement plans using Monte Carlo simulations
📈 Main assumptions
- Returns: Set expected (nominal) returns pre/post retirement. The Monte Carlo test uses your volatility (σ) to show a probability of success, not just one number.
- Inflation: Enter spending in today’s dollars; the calculator inflates it each year in retirement to preserve purchasing power.
- Taxes: A single effective rate keeps the model fast and transparent. Want to be conservative? Nudge it up and re-run.
- Contributions: Annual contributions continue until your retirement age, then stop.
- Social Security: Enter your monthly benefit at FRA; we auto-adjust for claiming early or delaying to 70.
- RMDs: Required Minimum Distributions start at 73 (or 75 starting in 2033). Each year you withdraw the greater of your grossed-up spending or the RMD minimum.
- IRS tables: RMD calculations use the IRS Uniform Lifetime Table as published by the U.S. Internal Revenue Service.
🔍 Reading your results
- ✅ Success probability: Share of Monte Carlo runs where funds last to your end age.
- 💼 Balance at retirement: Projected nest egg at the retirement age (expected-return case).
- 🗓️ Table & chart: Year-by-year cash flows, RMDs, Social Security, and ending balance.
💡 Quick ways to improve
- Delay claiming: Try moving Social Security from 62 → 70 and compare results.
- Boost savings: Increase annual contributions; add 50+ catch-up amounts.
- Trim spending: Reduce discretionary items by 5–10% or only in early years.
- Be realistic: Lower expected returns or raise σ a bit to stress-test.
We don’t require signup. Inputs and exports stay on your device. For rare server tools (like OCR), files auto-delete within minutes.
❓ Frequently asked questions
📅 When do RMDs start?
At 73 under current rules, and 75 starting in 2033. The first RMD can be delayed until April 1 of the following year (which can cause two RMDs that year).
🕰️ Does claiming early/late change results?
Yes. Enter the benefit at FRA; the app reduces it for early claims and increases it for delays up to age 70, then flows it into each projection year.
📊 Does it handle inflation?
Yes. Spending is in today’s dollars and is inflated annually during retirement so your lifestyle keeps pace with prices.
💸 Are taxes exact?
No—taxes vary widely. We use a single effective rate for speed and clarity. For a margin of safety, add a few points and re-run.
🧾 Roth vs pre-tax?
This calculator supports U.S. retirement planning assumptions. You can combine Roth and pre-tax balances using a blended effective tax rate, or run separate scenarios for traditional IRA/401(k) and Roth accounts.
📤 Can I export & share?
Yes. Download a PDF summary and a CSV of cash flows—no account or email needed.
Why no signup?
We believe planning tools should be fast and private. This calculator runs entirely in your browser; inputs and exports never leave your device.
For rare tools that need a server (like OCR), files auto-delete within minutes and we rate-limit to prevent abuse.
🕒 Last Updated: December 22, 2025 • Version 1.1
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