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Per Diem Calculator

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The Per Diem Calculator is designed to help users calculate the daily interest (per diem) rate and amount for a loan based on an annual interest rate and principal amount. It offers two modes: Basic Calculation for direct per diem estimates and Advanced Calculation for calculating custom daily interest rates over a specified number of days.

Per Diem Calculator

Enter the annual interest rate in percentage to calculate the per diem rate and amount.

Provide the principal loan amount in dollars for which the per diem is calculated.

This field will display the per diem rate in percentage. Leave it blank to calculate.

This field will display the per diem interest amount in dollars. Leave it blank to calculate.

Input Field Guide

Each input field is crafted to make it easy to understand and use. The table below provides a breakdown of each field’s purpose with an example.

Basic Calculator

Input Field Description Example Value
Annual Interest Rate (%) Enter the annual interest rate in percentage, used to calculate the per diem rate and amount. 5.5
Principal Amount ($) The total loan amount in dollars, for which the per diem interest is calculated. 10000
Per Diem Rate (%) Displays the calculated per diem rate in percentage (1/365 of annual interest rate). 0.0151
Per Diem Amount ($) Shows the calculated daily interest payment in dollars, based on the principal amount. 1.51

Advanced Calculator

Input Field Description Example Value
Annual Interest Rate (%) Enter the yearly interest rate in percentage to determine the custom per diem interest for a given duration. 5.5
Principal Amount ($) Enter the loan’s principal amount in dollars to calculate custom per diem interest over the specified days. 10000
Number of Days Specify the number of days to see the interest calculated for a customized period. 30
Custom Per Diem Rate (%) This field shows the custom per diem rate in percentage based on the input days and interest rate. 0.1833
Custom Per Diem Amount ($) Shows the custom daily interest amount in dollars over the specified number of days. It is readonly. 1.83

How To Calculate

Below are two examples demonstrating how to use the calculator in both Basic and Advanced modes. Each calculation is explained step-by-step.

Basic Calculator Example

Step Calculation Result
Annual Interest Rate (%) 5.5 5.5
Principal Amount ($) 10000 10000
Per Diem Rate (%) 5.5365=0.0151\frac{5.5}{365} = 0.0151 0.0151
Per Diem Amount ($) 10000×0.0151100=1.5110000 \times \frac{0.0151}{100} = 1.51 1.51

Advanced Calculator Example

Step Calculation Result
Annual Interest Rate (%) 5.5 5.5
Principal Amount ($) 10000 10000
Number of Days 30 30
Custom Per Diem Rate (%) 5.530=0.1833\frac{5.5}{30} = 0.1833 0.1833
Custom Per Diem Amount ($) 10000×0.1833100=1.8310000 \times \frac{0.1833}{100} = 1.83 1.83

To calculate, input the known values and select Calculate. Use Reset to clear all fields for a new calculation.

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