Search official GSA CONUS data before you estimate the trip.
Use ZIP when you know the exact destination, city and state for named localities, state for a broad standard-rate estimate, county for county-based localities, or installation for common military destinations mapped to nearby ZIP codes.
ZIP code
Best for exact CONUS lodging and M&IE lookup.
City and state
Useful when orders list the city but not a ZIP.
County
Matches against GSA county/locality text from the state data.
Installation
Fast lookup for common bases using a nearby ZIP mapping.
GSA covers CONUS per diem data. OCONUS estimates should be checked against DoD, State Department, orders, and finance guidance for the specific foreign or non-foreign locality.
PCS
PCS travel estimator.
Estimate authorized PCS travel days, MALT mileage, lodging nights, and meals. This is a planning tool, not an entitlement decision.
Enter PCS miles and rates to estimate travel days and planning totals.
TDY
TDY cost calculator.
Estimate the major reimbursable parts of a TDY trip: lodging, M&IE, POV mileage, rental car, and other expenses.
Enter TDY costs to estimate the full planning total.
Mileage
POV mileage calculator.
Use current DTMO-published 2026 planning rates for official TDY, PCS/MALT, and other POV travel estimates.
Enter miles and choose the official travel rate type.
Travel rules
Plain-English travel guide.
How per diem works
Per diem is a daily allowance for lodging, meals, and incidental expenses while on official government travel.
M&IE
M&IE covers meals and incidental expenses. Provided meals can reduce the full-day amount, but first and last travel days use travel-day rules.
Lodging caps
Lodging is normally limited to actual lodging cost up to the locality cap, unless actual expense authority applies.
First and last day
The calculator defaults to 75% M&IE for departure and return travel days.
PCS travel
PCS POV travel days and MALT estimates depend on official distance, traveler category, and orders.
Common mistakes
Do not treat a planning estimate as an entitlement. Check lodging receipts, orders, provided meals, DTS routing, and finance policy.
FAQ
Per diem questions people ask before travel.
What is per diem?
Per diem is an allowance for lodging, meals, and incidental expenses during official government travel.
Who qualifies for per diem?
Eligibility depends on official travel status, orders, agency policy, JTR, DTS, DFAS, and finance office review. This site estimates, it does not approve entitlement.
Does MyPerDiem use official GSA data?
CONUS lookup requests official GSA API data. OCONUS rates are manual because locality, currency, orders, and authorizations vary.
Can I search by installation?
Yes for common military installations in the quick list. If a base is missing, search by ZIP or nearby city and state.
How does the first and last day rule work?
The calculator uses 75% M&IE for departure and return days by default.
Are lodging taxes included?
Lodging taxes and fees are entered separately because reimbursement rules and exemptions can vary by trip and locality.
Can I save a report?
Yes. The report downloads locally after the save wait. MyPerDiem does not store the report.
Is this official?
No. MyPerDiem.us is private and not operated by GSA, DoD, DFAS, DTS, or a finance office.
Simple inputs, traceable math, official references.
CONUS rates are requested from the GSA Per Diem API by ZIP, fiscal year, and month. OCONUS trips are manual because foreign nation rates depend on DoD tables, currency, locality, and orders-specific authorization.
1. Count the trip.
Departure and return dates create total days, lodging nights, first/last travel days, and full TDY days.
2. Apply rates.
Lodging is capped by the daily lodging rate. M&IE is split into travel days and full days.
3. Deduct meals.
Provided meals reduce full-day M&IE using the breakfast, lunch, and dinner amounts entered or loaded from GSA.
4. Produce a report.
The report shows lodging, M&IE, deductions, taxes or fees, other expenses, over-cap lodging, and suggested advance.
This calculator is not a government entitlement system. OCONUS, actual expense authorization, government quarters, unit policy, split disbursement, local vouchers, and travel office decisions can change the final amount.
Privacy Policy
Calculator data stays in your browser unless a rate lookup is requested.
MyPerDiem.us is a military TDY planning calculator. The trip details typed into the calculator are processed in your browser to create an estimate and downloadable report. If you use the CONUS GSA lookup button, the destination ZIP, fiscal year, and month are sent to this server so it can request the matching GSA rate.
Advertising
MyPerDiem.us uses Google AdSense. Google and its partners may use cookies, device identifiers, and similar technologies to serve ads, limit fraud, measure ad performance, and personalize advertising where allowed.
Your ad choices
You can manage Google personalized ads at Google Ads Settings. You can also opt out of some third-party personalized advertising through industry opt-out tools such as About Ads.
Rate lookups
GSA rate lookups are used only to retrieve public per diem data. The calculator does not ask for names, Social Security numbers, payment cards, orders, or travel voucher documents.
Downloads
Saved reports are generated locally by your browser. MyPerDiem.us does not store the report file after it is downloaded.
The site may receive ordinary server logs such as request time, URL, browser type, referring page, and IP-derived network information. These logs are used for security, abuse prevention, debugging, and uptime checks.
MyPerDiem.us is not intended for children and is not an official government website. For security reports, use the instructions at security-contact.txt.
Use this as a planning estimate, not as an entitlement decision.
MyPerDiem.us is a private planning tool for military TDY per diem estimates. It is not operated by GSA, DoD, DFAS, DTS, a finance office, or any other government agency.
Verify the final amount
Orders, JTR rules, DTS routing, unit policy, finance office review, government quarters, actual expense authorization, provided meals, and split disbursement can change the final reimbursement.
CONUS and OCONUS
CONUS rates may be loaded from GSA public data. OCONUS rates are manual because foreign nation locality rules, currency, and authorizations vary.
No financial advice
The calculator output is informational. Do not use it as legal, tax, accounting, financial, or entitlement advice.
Use responsibly
Do not use the service for illegal activity, destructive testing, scraping, or attempts to disrupt the site or its upstream data sources.
Always verify travel payments with your orders, DTS, JTR, DFAS guidance, and finance office before making spending decisions.
