Retirement Calculators: How Much Do You Really Need?
Knowing your number turns a vague worry into a clear plan. Use retirement calculators to find out how much you need to retire and what to do next.
Understand What Calculators Can and Cannot Tell You
Our in-depth retirement calculator guide explains the assumptions behind every estimate, including inflation, investment returns, life expectancy, taxes and Social Security. Learn why results differ between tools and how to avoid the most common mistakes.
Compare the Best Retirement Savings Calculators
Our practical calculator comparison tests free tools side by side, from a simple retirement savings calculator to a full retirement income calculator and a 401k calculator. Choose the one that fits your situation.
Six People, Six Retirement Numbers
Different ages and incomes led to very different answers. See how six people planned. Each has a dedicated page explaining their situation, their problems and what their calculations showed.
Browse all retirement calculator articles below.
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Retirement Calculators Explained: What They Do, What They Assume, and How to Read the Results (2026)
By Jozsef Huszar • Updated: October 5, 2026 A retirement calculator can show where your savings might land, but only if you understand the assumptions behind the numbers. A retirement calculator takes a few numbers you provide (your age, savings, contributions, expected return) and produces a projection: how much you might have, how much you…
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Start Saving for Retirement: How Michelle Uses a Calculator to Turn a Small Habit Into Motivation
By Jozsef Huszar • Updated: September 25, 2026 You don’t need a big paycheck to start saving for retirement. You need a number that makes the habit feel real. Michelle just started saving for retirement. The amount she’s putting away each month is small, and retirement itself is decades away — far enough off that…

