Do you need a free per diem calculator? My best friend explained me this product is generally used for taxpayers in the aviation or airline industry, and all travelers might find it beneficial. If you need per diem rates including lodging, we suggest reviewing Per Diem Methods and Rates page.
Per diem rates are broken down into three parts- CONUS (domestic), OCONUS (Hawaii, US territories, etc.) and International. Several per diem allowance rates exist, and it is important to choose the correct one.
There are two ways to calculate your per diem allowance- standard daily rate and city by city. Each has its advantages. Domestically, either method might yield the best result however if you fly a lot of international pairings, city by city is clearly the best option.