To give you an idea of what you might receive, for 2017, the average SSDI benefit amount is $1,171 per month, but those whose income was fairly high in recent years can receive up to $2,687. If you're interested in how Social Security calculates your AIME and PIA, here's how.
http://www.nolo.com/legal-encyclopedia/how-much-social-security-disability-ssdi-benefits-can-you-get.html
 Social Security provides more than just retirement benefits. ο Retired workers and their dependents account for 71% of total benefits paid. ο Disabled workers and their dependents account for 16% of total benefits paid.  About 90 percent of workers age 21-64 in covered employment in 2016 and their. families have protection in the event of a long-term disability.  Just over 1 in 4 of today’s 20 year-olds will become disabled before reaching age 67.
https://www.ssa.gov/news/press/factsheets/basicfact-alt.pdf
Or you can call or visit your local Social Security office to ask for help. Social Security applies a formula to your average lifetime earnings to calculate the amount of your monthly check. The average SSD payment is currently $1,165. The highest dollar amount you can receive from SSD monthly in 2015 is $2,663.
http://www.alllaw.com/articles/nolo/disability/collecting-payments.html
If you earn less than the SGA (for 2016, it's $1,130 per month), your monthly benefits won't be impacted. If you earn more than that amount, Social Security will give you a trial work period of nine months to see if your return to work will be permanent.
http://www.alllaw.com/articles/nolo/disability/collecting-payments.html
The size of that benefit check will also depend on wage inflation. This year’s top monthly benefit at 66, or full retirement age (which is the benchmark the agency uses), is $2,663 ($31,956 a year). By contrast, the average Social Security payout is a more modest $1,287 ($15,444 a year). If you wait until age 70 to claim, delayed retirement credits will boost your payment to $3,515 in today’s dollars ($42,182 a year).
http://time.com/money/3920675/social-security-maximum/
The PIA for someone who became eligible for SSDI in 2017 is the sum (total) of the following: 90% of the first $885 of average indexed monthly earnings. 32% of the average indexed monthly earnings over $885 through $5,336, and.
http://www.nolo.com/legal-encyclopedia/how-much-social-security-disability-ssdi-benefits-can-you-get.html
ο Social Security benefits represent about 34% of the income of the elderly. ο Among elderly Social Security beneficiaries, 48% of married couples and 71% of. unmarried persons receive 50% or more of their income from Social Security.
https://www.ssa.gov/news/press/factsheets/basicfact-alt.pdf
The PIA for someone who became eligible for SSDI in 2017 is the sum (total) of the following: 1  90% of the first $885 of average indexed monthly earnings. 2  32% of the average indexed monthly earnings over $885 through $5,336, and. 3  15% of the average indexed monthly earnings over $5,336.
http://www.nolo.com/legal-encyclopedia/how-much-social-security-disability-ssdi-benefits-can-you-get.html
Use this Social Security benefit calculator to estimate your amount of Social Security benefits. Remember, this is only an estimate. Actual benefits may vary depending on actual work history and income. Information and interactive calculators are made available to you as self-help tools for your independent use and are not intended to provide investment advice. We cannot and do not guarantee their applicability or accuracy in regard to your individual circumstances.
http://www.bankrate.com/calculators/retirement/social-security-income-calculator-tool.aspx
Table 1. Number of people receiving Social Security, Supplemental Security Income (SSI), or both, February 2017 (in thousands) Type of beneficiary. Total.
https://www.ssa.gov/policy/docs/quickfacts/stat_snapshot/
how much does a person get in usd as social security on average
On an average, a person gets $1,165 in social security. On average, a person gets US$1,165 as social security.  