Gsa Per Diem 2024 Mileage Calculation. * airplane nautical miles (nms) should be converted into statute miles (sms) or regular miles when submitting a voucher using the formula (1 nm equals 1.15077945 sms). Simply enter your travel dates and details to find out your per diem allowance.
For calculating the mileage difference between airports, please visit the u.s. For fiscal year 2024 (which began october 1, 2023), the standard rate is $166.