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You can ballpark these numbers just fine. 500/mo UBI for 350 Million recipients is $2.1T per year. US GDP prior the pandemic was ~20T. Expenditures were about 4.4 trillion, revenue was 3.5 trillion (2019 numbers).

500/mo or 1k/mo UBI does require raising taxes and consolidating programs (a polite way of saying cutting). At 500/mo you'd raise the total tax rate (as of GDP), but it'd not be an unreasonable raise (as compared to 2k/mo UBI for all citizens which would need taxes at 40% of US GDP).