2 full days, 2 travel days at 75%
- Full-day rate = $69, travel day percent = 75%.
- Travel-day rate = 69 × 0.75 = $51.75.
- Full-day subtotal = 2 × 69 = $138.
- Travel-day subtotal = 2 × 51.75 = $103.50.
- Total per diem = 138 + 103.50 = $241.50.
finance calculator
Per Diem Calculator
Quickly total per diem for trips with full days and travel days (reduced rate), showing daily rates and total allowance.
Results
- Full-day per diem
- $69
- Travel-day per diem
- $52
- Full-day subtotal
- $138
- Travel-day subtotal
- $104
- Total per diem
- $242
How to use this calculator
- Enter the full-day per diem rate allowed by your employer or the GSA/IRS guidelines for your destination.
- Enter how many full days you’ll be away (days where you are entitled to the full per diem).
- Enter how many travel days you have (typically departure and return days).
- Adjust the travel-day percentage if your policy differs from the default 75%.
- We calculate the reduced travel-day rate, subtotals for full and travel days, and the total per diem allowance.
Inputs explained
- Per diem rate (full day)
- The full daily allowance for meals and incidental expenses (M&IE) or total per diem, often set by your employer or government rates for the travel location.
- Full days
- Number of full travel days where you are entitled to 100% of the per diem rate—typically days fully away from home, not including departure/return if policy uses reduced rates.
- Travel days
- Number of arrival/departure days to which a reduced per diem rate applies (for example, 75% of the full-day rate). Many policies count first and last day of travel as reduced-rate days.
- Travel day percent
- Typical policy is 75% on arrival and departure days; adjust to your policy.
How it works
Full days use 100% of the per diem rate.
Travel days use a reduced percent (default 75%).
We multiply each by the day counts and sum for the total.
Formula
Travel-day rate = Full-day rate × (Travel day percent ÷ 100)\nFull-day subtotal = Full days × Full-day rate\nTravel-day subtotal = Travel days × Travel-day rate\nTotal per diem = Full-day subtotal + Travel-day subtotal
When to use it
- Estimating per diem for work travel reimbursements.
- Budgeting trip allowances when applying the 75% travel-day rule.
- Checking employer or client per diem totals against your own calculations before submitting expense reports.
- Planning personal travel budgets when you want to simulate an M&IE allowance structure.
Tips & cautions
- Update the rate if you know the local GSA per diem for your destination.
- Set travel days to 0 if all days are full per diem.
- Keep records of which days are full vs travel days in your expense documentation so they match this calculation.
- Does not fetch location-specific per diem tables; enter your rate manually.
- Single rate applied across the whole trip.
Worked examples
3 full days, 1 travel day at 50%
- Full-day rate = $80, travel day percent = 50%.
- Travel-day rate = 80 × 0.50 = $40.
- Full-day subtotal = 3 × 80 = $240.
- Travel-day subtotal = 1 × 40 = $40.
- Total per diem = 240 + 40 = $280.
Deep dive
Total your per diem using the 75% travel-day rule: enter the per diem rate, full days, and travel days to see subtotals and total allowance.
Use this per diem calculator to apply reduced travel-day rates and get a quick total for trip reimbursements.
FAQs
- Does this calculator use official GSA or IRS rates?
- No. You must enter the applicable per diem rate yourself based on your employer’s policy or official tables for your travel destination.
- Can I use different rates for different days?
- This simple calculator uses one full-day rate and one travel-day percentage for the whole trip. If your rate changes by location or date, run separate calculations and add the totals.
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This per diem calculator provides a simplified estimate based on user-entered rates and a single travel-day percentage. It does not incorporate location-specific government tables, employer policy nuances, or tax rules. Always confirm per diem guidelines and reimbursement amounts with your employer, client, or tax advisor before relying on this estimate.