SSDI Calculator: How Much SSDI Will I Get?
How much SSDI will you get? It depends on what you earned over your working life, not on your condition. This free SSDI calculator asks about your earnings and work history and gives a ballpark monthly range. Your official amount comes from Social Security.
Free · No account needed · Private · About 2 minutes
How it works
- 1
Share your work history
Tell us your age and roughly what you have earned over the years.
- 2
We run the 2027 formula
We use SSA's 2027 benefit formula to make a ballpark estimate.
- 3
See your estimate
Get a monthly range and tips to check your real number.
What you get
- A ballpark monthly SSDI estimate
- How SSA's benefit formula works, in plain words
- How the five-month waiting period may affect timing
- How to find your official estimate from SSA
What this tool does
- • Uses SSA's 2027 benefit formula
- • Gives a rough range to help you plan
- • Explains why estimates can differ
What this tool does not do
- • Does not give your official SSA amount
- • Does not decide if you qualify
- • Does not include state or private benefits
How Your SSDI Amount Is Calculated
Your SSDI payment is based on your average earnings over your working life, not on your condition. Social Security (SSA) runs those earnings through a formula. In 2027, it pays 90% of the first $1,340 of your average monthly earnings, 32% of the next amount up to $8,077, and 15% above that.
That formula means lower earners get back a bigger share of their pay, while higher earners get a bigger check overall.
This calculator does not see your real earnings record, so it uses a shortcut. It starts with a typical monthly range for your yearly earnings, adjusts it for how many years you worked in total and in recent years, and keeps the result within SSA's limits.
Not sure you have worked enough to qualify? Check your work credits with our Work Credits & Date Last Insured Check.
SSDI payments usually start after a five-month waiting period. Medicare usually starts 24 months after your payments begin. For your official number, check your my Social Security account.
SSDI Back Pay Calculator
SSDI back pay is the money Social Security owes you for months you were disabled before your payments started. Two dates decide how much you get: your established onset date, which is the day SSA agrees your disability began, and your application date.
First, SSA applies a five-month waiting period. You are not paid for the first five full months after your onset date. Back pay starts with the sixth month.
Next, SSA counts the months from the end of that waiting period up to the month your payments begin. If your onset date is well before you applied, SSA can also pay retroactive benefits for up to 12 months before your application date. It cannot go back further than that, even if your disability started years earlier.
To get a rough idea, multiply your monthly SSDI amount by the number of months owed. This calculator estimates that monthly amount; it does not count months for you. SSA sets your real back pay, usually as one lump-sum payment. Your award letter shows the official figure.
Common questions
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Last updated October 2026. For general information only, not legal or medical advice.
Sources: SSA: Primary Insurance Amount formula · SSA: my Social Security
How the SSDI Calculator calculates your monthly SSDI range
Social Security bases your real check on your lifetime earnings record, which this page cannot see. So the calculator works from three of your answers and builds a range, not a single number.
Step one is your usual yearly pay. Each pay band has its own starting range. Under $25,000 starts at $830 to $1,240 a month. $25,000 to $40,000 starts at $1,140 to $1,760. $40,000 to $60,000 starts at $1,550 to $2,380. Over $60,000 starts at $2,070 to $3,320.
Step two is how long you have worked in total. Both ends of the range get multiplied: 0.7 for under 5 years, 0.85 for 5 to 9 years, 1.0 for 10 to 19 years, and 1.1 for 20 years or more. A longer career usually means more years of earnings for SSA to average.
Step three looks at the last ten years. If you worked only 0 to 1 of them, $200 comes off each end. Working 2 to 4 of them takes off $100. Working 5 to 7 changes nothing, and 8 to 10 adds $50. Recent work matters because SSDI needs work credits earned close to when your disability began.
Last, two guard rails apply. The low end never drops below $400, and the high end stops at $3,940.
Here is a worked example. Dana earned about $50,000 a year, has worked 22 years, and worked 9 of the last 10. Her band starts at $1,550 to $2,380. Times 1.1, that becomes $1,705 to $2,618. Adding $50 gives a range of $1,755 to $2,668 a month.
What you'll need before you start
Your usual yearly pay before taxes. Box 1 of your W-2 works, or log in to my Social Security at ssa.gov and open your earnings record, which lists every year SSA has on file.
How many years you have worked in total, and how many of the last ten. That same earnings record shows any years with zero earnings.
Whether you are working now. If you are, keep a recent pay stub handy, since high monthly pay can affect whether you qualify at all.
Roughly when your condition started to keep you from working, and whether a doctor or clinic is treating you. These do not change the dollar range, but they shape the notes and confidence level you see with your result.
The benefit formula behind every SSDI payment is published by the Social Security Administration on its Primary Insurance Amount formula page.
