For Social Security Disability Insurance, your monthly checks are based on your work and salary history but subject to limits set by the government. In mid-2018 the average payment from the program was $1,198 per month. The maximum allowed amount was $2,788 per month.
For Supplemental Security Income, the government applies a standard amount to everyone, which changes each year. It was set at $771 per month for an individual in 2019 and $1,157 for a couple.