Retirement calculator

Project a retirement balance from current savings and monthly contributions, then adjust it for your inflation assumption.

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Retirement calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Saved now

Monthly contribution

More inputs and assumptions

Years until retirement

Annual effective return (%)

Annual inflation (%)

Answer

…

Monthly rate r = (1 + annual return)^(1/12) − 1. Balance = initial × (1 + r)^n + monthly contribution × ((1 + r)^n − 1)/r; use n contributions when r = 0. Divide by (1 + inflation)^(n/12) for today’s purchasing power.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Contributions arrive at month-end. Years are rounded to the nearest month. Annual return is effective, converted to a monthly rate. Inflation is constant. This projects savings, not a sustainable withdrawal rate. Fixed assumptions only: no taxes, fees, changing returns, guarantees or product eligibility. Amounts share one currency.

Automatic precision shows money to two decimal places and other numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

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Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

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Updated 2026-09-26

Using Retirement calculator

Next: Annuity payout calculator

A worked example

Example inputs: saved now = 10000, monthly contribution = 100, years until retirement = 10, annual effective return (%) = 0, annual inflation (%) = 0. Projected retirement balance = 22000.

Before you use the result

Example results for saved now

These examples use Monthly contribution: 100; Years until retirement: 10; Annual effective return (%): 0; Annual inflation (%): 0. They are reference calculations, not recommended settings.

Saved now	Projected retirement balance
5000	17,000.00
10000	22,000.00
20000	32,000.00

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ToolOctopus. “Retirement calculator.” Updated 2026-09-26. https://tooloctopus.com/retirement-calculator.

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