Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Projected balance
$1,670,967
Total contributed
$356,000
Years until retirement
35
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter current age.
- 2Enter retire at.
- 3Enter current savings ($).
- 4Enter monthly contribution ($).
- 5Enter annual return (%).
- 6Read your projected balance on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Estimate the balance you'll have at retirement based on current savings, monthly contributions, and expected return.
Worked example
Using the values the calculator loads with:
Inputs
- Current age: 30
- Retire at: 65
- Current savings: 20000 $
- Monthly contribution: 800 $
- Annual return: 7 %
Results
- Projected balance: $1,670,966.72
- Total contributed: $356,000.00
- Years until retirement: 35
What each field means
Inputs
- Current age
- The current age used in the calculation. Starts at 30 so you have a working example on load. Accepted range: 0–100.
- Retire at
- The retire at used in the calculation. Starts at 65 so you have a working example on load. Accepted range: 1–100.
- Current savings ($)
- The current savings used in the calculation, measured in $. Starts at 20000 $ so you have a working example on load.
- Monthly contribution ($)
- The monthly contribution used in the calculation, measured in $. Starts at 800 $ so you have a working example on load.
- Annual return (%)
- The annual return used in the calculation, measured in %. Starts at 7 % so you have a working example on load.
Results
- Projected balance
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total contributed
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Years until retirement
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the retirement calculator work?
Estimate the balance you'll have at retirement based on current savings, monthly contributions, and expected return.
What do I need to enter?
5 values: current age, retire at, current savings, monthly contribution, and annual return. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the projected balance result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Retirement Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/retirement
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/retirement" target="_blank" rel="noopener">Retirement Calculator — RevenueLab</a> (2026).</p>
Source: [Retirement Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/retirement) (2026).