What GSA M&IE per diem is
When federal travelers (and many contractors or agencies that follow federal travel rules) go on official travel, the U.S. General Services Administration (GSA) publishes per diem rates. Per diem usually has two big pieces: lodging and M&IE: meals and incidental expenses. M&IE is a daily allowance for meals and small incidentals; it is not a receipt-by-receipt grocery log in the typical CONUS per diem model.
The GSA M&IE Per Diem Calculator on HustleNumbers estimates M&IE only. It does not include lodging. Lodging ceilings vary by locality and must be looked up separately on GSA’s per diem site for the destination and travel dates.
M&IE tiers and your destination
GSA assigns M&IE amounts by locality. Many CONUS destinations use a standard tier; higher-cost areas use higher published M&IE tiers. In the calculator, you pick the M&IE tier that matches your destination (for example the standard CONUS tier or a higher listed tier). If you are unsure, look up the city or ZIP on GSA’s per diem rates page and enter the M&IE figure shown there. Do not invent a tier. Use the published locality rate for your travel dates.
Rates and locality tables are updated on GSA’s schedule. Always confirm the current M&IE amount and any agency-specific policy before you submit a voucher. This tool is a planning aid that applies the common first/last-day rule to the tier you select.
First and last day at 75%
Under standard federal M&IE rules for CONUS travel, the first and last calendar days of the trip are reimbursed at 75% of the full daily M&IE rate. Full days in between receive 100% of the daily rate. That is why a five-calendar-day trip is not simply “five × full rate.”
Count calendar travel days, not hotel nights. A common pattern: if you are away for N nights, you often have N+1 travel days (depart day through return day). Enter that total day count in the tool so first/last 75% and middle full days are applied correctly.
How to use this calculator
- M&IE tier: select the published daily M&IE amount for your destination from the dropdown (after you confirm it on gsa.gov).
- Total travel days: enter the number of calendar days from departure through return.
- Read the results: total M&IE reimbursement, full-day rate, first/last day amount (75%), how many full days vs travel days at 75%, and a simple meal/incidental breakdown for the full daily rate.
All calculations run locally in your browser. Nothing about your trip is uploaded to a server.
What to do about lodging
Lodging per diem is location-specific and often changes by season. This calculator intentionally excludes it so you do not mix a meals estimate with an outdated hotel ceiling. After you estimate M&IE here, look up lodging for the same destination and dates on GSA’s per diem tool, then add any airfare, rental car, or other authorized expenses per your agency’s travel policy.
A simple trip example
Suppose you travel Tuesday through Saturday (five calendar days) to a destination whose published M&IE tier you have confirmed on gsa.gov. You select that tier and enter 5 travel days. The calculator treats two days at 75% (first and last) and three days at the full daily rate, then sums them into a total M&IE estimate. If your itinerary is only a day trip (leave and return the same calendar day), agency rules for same-day travel can differ. Confirm with your travel office rather than assuming a multi-day pattern.
Practical tips for vouchers
- Match the locality and effective dates on GSA’s site to your actual travel dates.
- Know whether your organization uses straight GSA per diem, a contract, or a reduced meal rate when meals are provided (conference breakfasts, etc.).
- Keep the trip purpose and authorizations clear; M&IE math is only one part of an approved voucher.
- Incidental expenses in M&IE are not a blank check for every tip or fee, follow the Federal Travel Regulation and your agency’s guidance.
Next steps checklist
- Look up your destination’s current M&IE (and lodging) on gsa.gov for the travel dates.
- Count calendar travel days carefully (depart + return).
- Run the M&IE calculator with the published tier and day count.
- Add lodging and transportation estimates separately for a full trip budget.
- Before filing, re-check GSA figures and any agency overlays (provided meals, leave, etc.).
Related tools on HustleNumbers
- Invoice Generator: if you bill a client for travel as a contractor, itemize clearly (this calculator is not an invoice).
- Quote / Proposal Generator: estimate project fees before travel; keep per diem estimates separate from professional fees.
- Rate Card Generator: publish your service rates when travel billing is separate from per diem.
Published reference only. M&IE tiers and rules follow GSA and federal travel guidance and can change. Confirm current locality rates and policies on gsa.gov and with your agency travel office. This tool estimates M&IE only (not lodging) and is educational, not official reimbursement approval or legal advice.