A retirement calculator answers: If I keep saving at today’s pace, what might I have at age 65—and how much monthly income could that support? It is not a substitute for a fiduciary advisor, but it turns vague worry into numbers you can adjust.

This guide covers inputs, the 4% rule, savings benchmarks by age, and Toolsle’s free retirement calculator.

What to enter

The 4% rule (starting point)

Withdraw 4% of the portfolio in year one of retirement, then adjust that dollar amount for inflation each year. On $1,000,000, year-one spending is about $40,000 before taxes. The rule comes from historical U.S. portfolio studies—it is a planning shortcut, not a guarantee.

25× rule: Multiply desired annual spending by 25 for a rough nest-egg target (inverse of 4%).

Savings by age (planner benchmarks)

Medians in federal surveys lag these targets—catch-up contributions after 50 help.

Pair with compound interest detail

For year-by-year growth tables, use the compound interest calculator. For exact years until a date, try the age calculator.

Common mistakes

• Ignoring employer match in monthly contributions
• Using nominal returns without inflation for spending power
• Forgetting healthcare between retirement and Medicare
• Assuming you can retire at 55 without a bridge plan for penalty-free withdrawals

Try the free retirement calculator

Open the retirement calculator, set your ages, savings, contributions, and return assumptions. Review projected balance, inflation-adjusted total, and estimated monthly income from the 4% rule.