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Social Security benefits calculator

Estimate your US Social Security retirement benefit. From your birth year the tool finds your full retirement age (FRA), applies the bend-point formula of the year you turn 62 — they are fixed for life at that point — to your average indexed earnings to get the primary insurance amount, then adjusts for filing early (a permanent reduction) or late (delayed-retirement credits of 8% a year to age 70). It projects the monthly benefit and the lifetime total with your expected cost-of-living adjustments.

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Need Full retirement age, Primary insurance amount (monthly, at FRA), Filing-age adjustment, Estimated monthly benefit, First-year annual benefit, Estimated lifetime total (with COLA)? The Social Security benefits calculator derives it from Birth year, Average indexed earnings over 35 years, Planned filing age (62–70), Expected annual COLA, Life expectancy (age) in one step. For instance, with Birth year = 1,960, Average indexed earnings over 35 years = $60,000.00, Planned filing age (62–70) = 67, Expected annual COLA = 2.5% and Life expectancy (age) = 85 it returns Full retirement age = 67 y 0 mo, Primary insurance amount (monthly, at FRA) = $2,193.92 and Filing-age adjustment = 0%.

How to use it

  1. Enter your values: Birth year, Average indexed earnings over 35 years, Planned filing age (62–70), Expected annual COLA, Life expectancy (age).
  2. Read the result instantly: Full retirement age, Primary insurance amount (monthly, at FRA), Filing-age adjustment, Estimated monthly benefit, First-year annual benefit, Estimated lifetime total (with COLA).

Frequently asked questions

How does the Social Security benefits calculator work?

It takes Birth year, Average indexed earnings over 35 years, Planned filing age (62–70), Expected annual COLA and Life expectancy (age) and derives Full retirement age, Primary insurance amount (monthly, at FRA), Filing-age adjustment, Estimated monthly benefit, First-year annual benefit and Estimated lifetime total (with COLA) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

5 values: Birth year, Average indexed earnings over 35 years ($), Planned filing age (62–70), Expected annual COLA (%) and Life expectancy (age). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Birth year = 1,960, Average indexed earnings over 35 years = $60,000.00, Planned filing age (62–70) = 67, Expected annual COLA = 2.5% and Life expectancy (age) = 85, the calculator returns Full retirement age = 67 y 0 mo, Primary insurance amount (monthly, at FRA) = $2,193.92 and Filing-age adjustment = 0%. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Birth year = 3,920, Average indexed earnings over 35 years = $120,000.00, Planned filing age (62–70) = 134, Expected annual COLA = 2.75% and Life expectancy (age) = 170 instead, Primary insurance amount (monthly, at FRA) goes from $2,193.92 to $3,563.21 — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which units should I enter the values in?

Enter Expected annual COLA %.

What does it give for smaller values?

Scaled down to Birth year = 980, Average indexed earnings over 35 years = $30,000.00, Planned filing age (62–70) = 34, Expected annual COLA = 2.25% and Life expectancy (age) = 43, Primary insurance amount (monthly, at FRA) comes out at $1,337.08. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Checking whether the pot is on track, testing how long it lasts at a chosen withdrawal rate, and seeing what a few more years of contributions change.

What is the most common mistake?

Assuming an average return arrives evenly. A poor decade at the start of drawdown does far more damage than the same decade at the end, even when the average is identical.

How accurate is it, and what are the limits?

Enter your average indexed earnings over 35 years, not your current salary — the two are very different, and years you did not work count as zeros in that average. Bend points are those of the year you turn 62 and are fixed for life at that point; years beyond the last SSA has published are priced at the latest announced figures. For official numbers use your ssa.gov statement.

What is the difference between the Social Security benefits calculator and the 401(k) employer match calculator?

This one returns Full retirement age and Primary insurance amount (monthly, at FRA); the 401(k) employer match calculator returns Your contribution and Employer match. That is the whole difference — open the one whose figure you need.

Further reading

All guides →
ExplainerThe Three Brackets That Set Your Social Security CheckThe benefit is 90 percent of the first slice of your indexed career average, 32 percent of the next and 15 percent of the rest — 1,286 and 7,749 dollars are the 2026 bend points. Then age adjusts it: claiming at 62 with a full retirement age of 67 cuts it 30 percent, waiting to 70 adds 24.ComparisonLife Assurance or a Pension Plan: the Lock-Up Decides, Not the Tax BreakScore both wrappers on the same rows and the pension plan wins the arithmetic at almost every horizon and almost every combination of tax rates — including when the rate does not fall at all. Which is exactly why the deduction is the wrong thing to decide on.ExplainerThe 4 Percent Rule: What It Actually ClaimsSpending $40,000 a year needs $1,000,000 at 4 percent and $1,333,333 at 3 percent. Where the number came from, what it measured, and the four objections that matter.ExplainerHow a 401(k) Employer Match Works (Free Money)An employer 401(k) match is free money: your company adds to your retirement savings when you contribute. See common match formulas, vesting, and why to grab the full match.ExplainerWhat Is Your FIRE Number? The 25× Rule ExplainedYour FIRE number is the nest egg that funds financial independence. Learn the 25× rule, the 4% safe-withdrawal rate, and Coast, Lean and Fat FIRE variants.ExplainerThe 4 Percent Rule Is a Result From One Country and One CenturyThe rule is the output of a named backtest on US data. Its inversion, 1 ÷ w, gives the multiple: 25× at 4 percent, 33.3× at 3 percent. And two paths with the same 4.7676 percent geometric mean end one at zero and one at $2,031,661.