Mileage Reimbursement Calculator
Estimate reimbursement for business miles using a custom per-mile rate.
FREE BUSINESS TRAVEL TOOL
Per Diem Calculator
Estimate lodging and meals-and-incidentals allowances for a business trip using your own daily rates and first/last travel-day percentage.
Lodging allowance
Meals & incidentals
Travel-day adjustment
CALCULATOR
Calculate per diem
Enter the rates that apply to your employer, agency, destination, and travel dates. Official per diem rates can vary by location and year, so Numviro does not hard-code a single government rate.
How to calculate per diem
Per diem commonly separates lodging from meals and incidental expenses. Start with the daily rates that apply to your trip, then multiply lodging by the number of eligible nights and meals-and-incidentals by the applicable travel days.
Total per diem =
(Lodging rate × Lodging nights) +
Meals & incidentals allowance +
Other approved allowances
First and last travel days
Some travel policies reduce the meals-and-incidentals allowance on the first and last day of travel. Numviro lets you set that percentage yourself instead of assuming one universal rule.
Travel-day M&IE =
Full-day M&IE rate × Travel-day percentage
Why this calculator uses custom rates
Per diem amounts can vary by destination, month, employer, government agency, and travel policy. Using custom inputs keeps the calculator useful for both employer travel policies and official-rate planning.
Rate lookup note:
U.S. federal travel rates are location-specific and are published by agencies such as
the General Services Administration for many domestic destinations.
Always verify the official rate that applies to the location and travel dates before using this estimate for reimbursement.
Per diem calculator FAQ
What is per diem?
Per diem is a daily allowance used to cover eligible travel costs such as lodging, meals, and incidental expenses during business or official travel.
How do I calculate lodging per diem?
Multiply the eligible lodging rate by the number of qualifying nights.
How do I calculate meals and incidentals?
Apply the full daily M&IE rate to full travel days and any reduced percentage required by the applicable policy to the first and last travel days.
Are per diem rates the same everywhere?
No. Rates can vary by destination, date, employer, agency, and travel policy.
Does this calculator automatically use the current GSA rate?
No. Enter the official or employer rate that applies to your trip. This avoids silently using a stale or incorrect rate.
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