Strata Works LLC · Federal Retirement Calculator

For federal employees under FERS

See your whole federal retirement, worked out on your phone.

Your FERS pension, the retiree supplement, TSP, Social Security, taxes and Medicare — projected year by year from the rules OPM, the TSP, the IRS and the SSA publish, with every rule cited to its source.

Coming soon toApp StoreGet it onGoogle Play

Free for iPhone, iPad and Android. No account. Nothing you enter leaves your device.

The app's dashboard showing projected monthly income in retirement against a spending goal
Built on the published rules

Every formula is cited to the agency that publishes it — 30 official sources, all listed on one page.

Private by design

No account, no sign-up, no servers, no analytics, no ads. The app contains no code that sends your information anywhere.

Shows the arithmetic

It explains how each figure is reached, shows a loss as plainly as a gain, and never tells you what to do.

What it works out

Your FERS pensionAt any retirement age, with the MRA+10 reduction, the 1.1% multiplier at 62 with 20 years, sick leave credit, a military service deposit, and the survivor election.
The retiree supplementWhether you qualify, what it pays until 62, and how much the earnings test takes back if you keep working.
Special provisionsLaw enforcement, firefighters and air traffic controllers, with their own eligibility ages and multiplier.
TSPContributions, the agency match, the Traditional and Roth split, and how long savings last at your spending.
Social SecurityYour benefit at the age you choose to claim, and a spouse’s, alongside everything else.
TaxesFederal tax by the IRS brackets for your filing status, a state rate, how much of Social Security is taxable, and required withdrawals at 73 or 75.
Health and insuranceFEHB and FEGLI premiums into retirement, Medicare Part B from 65 with the income surcharge, and a Health Savings Account.
Chance of successYour plan run through 1,000 simulated market histories, so a bad stretch early in retirement is part of the picture.
What-IfDrag a slider for retirement age, contributions or spending and watch the whole projection recalculate.
Compare plansSave different versions of your plan and see them side by side: retirement date, spending, chance of success.
Cash flow, year by yearA statement of every year — what you hold, what comes in, what goes out — and a PDF report to share.
Check it against your estimateA screen that walks line by line through comparing the app with the official estimate from your agency.

A look inside

Screenshots use a made-up plan.

How it works

  1. Answer a few questionsBirth date, service dates, salary and TSP balance. Estimates are fine to start; the app shows which figures are still estimated.
  2. See your retirementMonthly income after insurance and tax, how long savings last, and your chance of success.
  3. Try other pathsChange the retirement date, contributions or spending, and compare plans side by side.

Free, with one optional purchase

Free

One-time unlock

Questions

Is this an official government app?
No. It is an independent educational tool and is not affiliated with OPM, the TSP, the SSA, the IRS or any agency. It uses the rules those agencies publish, and cites each one.
Does it tell me when to retire or what to invest in?
No. It models the choices you enter and shows what each one does to the numbers. It is not financial, investment, tax or legal advice. Check important figures with your agency’s official retirement estimate before deciding anything.
Is it for CSRS?
No. It models FERS, including the special provisions for law enforcement, firefighters and air traffic controllers.
What do I need to get started?
Nothing in particular — it works on estimates. A recent leave and earnings statement, your TSP balance and your Social Security estimate make the results sharper.
Where is my information stored?
Only on your device. You can export a backup file yourself to move to a new phone. Read the privacy policy.
Is there a web version?
No. The app runs on iPhone, iPad and Android only, so your plan stays on a device you hold.

Get the app

Coming soon toApp StoreGet it onGoogle Play

Questions or a figure that looks wrong? Support · strata.works2026@gmail.com

Support · Privacy policy · Sources