Per Diem Calculator
You paste GSA (or company) lodging and M&IE. Click any i for detail.
Trip days
Full days
i
Full days
Days that pay 100% of lodging + M&IE. |
|
|---|---|
Travel days
i
Travel days
First/last days, often 75% M&IE. |
|
Lodging / day ($)
i
Lodging
Cap from GSA or your policy. |
|
M&IE / day ($)
i
M&IE
Meals and incidentals. |
|
Travel-day %
i
Travel percent
GSA first/last M&IE is often 75. This sketch applies it to lodging+M&IE unless you zero lodging. |
How to use this calculator
- Look up lodging and M&IE for the city.
- Count full days vs travel days.
- Set travel-day percent (often 75).
- Separate actual lodging receipts if your policy requires them.
Results explained
Full days pay lodging + M&IE. Travel days pay that sum × travel %. Many federal trips pay 75% of M&IE only on travel days — zero the lodging line for those days if that is your rule.
Quick reference: per diem
GSA sets CONUS city rates; high-low CONUS is a fallback.
| Item | Detail |
|---|---|
| First/last day (common) | 75% of M&IE |
| Lodging | Often capped, receipted separately |
| M&IE | Meals + incidentals |
| Mileage | Different calculator |
International per diem (DoS/DoD) is a different table.
How the estimate is built
total = full×(L+M) + travel×(L+M)×pct.
Example scenario
3 full + 2 travel at $110+$68 with 75% travel ≈ $801.
FAQ
Why don’t you fetch GSA?
Same reason as mileage — you paste the rate that applies to your trip date and locality.
Provided meals?
Reduce M&IE per your policy; this page does not meal-deduct.
Mileage on the same trip?
Mileage reimbursement calculator.