Per Diem Calculator
Pick your destination and travel dates and PerDiemWise totals your lodging and meals & incidentals using the real GSA FY2026 rates — applying the 75% first-and-last-day M&IE rule and the correct nightly lodging cap for each date, broken out day by day.
Pick your travel dates to see the itemised per diem.
Saved trips
Save a calculated trip and it'll stay here on this device — handy for recurring routes and expense reports.
About the per diem calculator
Per diem is a fixed daily allowance — separate lodging and meals-and-incidentals (M&IE) figures — paid instead of reimbursing every individual receipt from a business trip. This calculator uses the official GSA FY2026 rate table, covering around 300 higher-cost cities plus the standard CONUS rate ($110 lodging / $68 M&IE) that applies everywhere else.
Two rules trip up almost every manual calculation: M&IE is paid at only 75% on your first and last travel day, and seasonal destinations have a different lodging cap for each month. This tool applies both automatically, so a multi-night trip that straddles a season change is totalled correctly without you having to look up two different monthly rates by hand.
For the full mechanics behind the numbers, see what is per diem? and how to calculate per diem for a business trip.
Frequently asked questions
Does this calculator use the real GSA rates?
Yes — it uses the official GSA FY2026 lodging and M&IE tables for every listed city, plus the standard CONUS rate for everywhere else.
Does it apply the 75% first-and-last-day rule automatically?
Yes — M&IE is calculated at 75% on your first and last travel day and 100% on full days in between, without you needing to adjust it manually.
What if my destination isn't a listed GSA city?
The calculator automatically falls back to the standard CONUS rate ($110 lodging / $68 M&IE for FY2026) for any US destination GSA hasn't separately listed.