## What is a Weighted Average Interest Rate?

The **Weighted Average Interest Rate** refers to an average that is adjusted to show the impact of each loan on total debt.

## Formula to Calculate the Weighted Average Interest Rate

- A
_{1}, A_{2}, and A_{n}are the**Loan Balances**. - i
_{1}, i_{2}, and i_{n}are the**Interest Rates**.

The **Loan Portfolio of Clients** dataset contains *“Clients”*, *“Balance”*, and *“Interest Rate”. *

### Method 1 – Using an Arithmetic Formula

Use an **arithmetic formula**.

** Steps**:

- Go to the
**D14**>> enter the formula below >> press**ENTER**.

`=(C5*D5+C6*D6+C7*D7+C8*D8+C9*D9+C10*D10+C11*D11+C12*D12)/(C5+C6+C7+C8+C9+C10+C11+C12)`

The product of the *“Balance”* and *“Interest Rates”* columns was calculated and divided by the total *“Balance”*.

This is the output.

**Read More: **How to Calculate Effective Interest Rate in Excel with Formula

### Method 2 – Utilizing the SUM Function

Apply the **SUM function**.

** Steps**:

- Go to
**D14**>> enter the expression below >> press**ENTER**.

`=SUM(C5:C12*D5:D12)/SUM(C5:C12)`

**C5:C12** and **D5:D12** arrays represent the *“Balance”* and *“Interest Rate” *columns.

**Read More: **How to Use Nominal Interest Rate Formula in Excel

### Method 3 – Applying the SUMPRODUCT and the SUM Functions

Combine the **SUM** and the **SUMPRODUCT** functions.

** Steps**:

- Enter the formula in
**D14**>> press**ENTER**.

`=SUMPRODUCT(C5:C12,D5:D12)/SUM(C5:C12)`

**Formula Breakdown**

**SUM(C5:C12) →**adds all numbers in a range of cells. Here, the values in**C5:C12**.**Output → $2,991,107**

**SUMPRODUCT(C5:C12,D5:D12) →**returns the sum of the products of the*“Balance”*and*“Interest Rate”*arrays. Here,**C5:C12**and**D5:D12**areand*array1*arguments in which the values of columns*array2***C**and**D**are multiplied.**Output → 252789.785**

**SUMPRODUCT(C5:C12,D5:D12)/SUM(C5:C12)****→**becomes**$2,991,107 / 252789.785 → 8.45**

* ***Note: **Open the **Format Cells **dialog box by pressing **CTRL +**** 1 ***and change the cell formatting to percentage.*

**Read More: **Nominal vs Effective Interest Rate in Excel

## How to Calculate the Weighted Average with Percentages in Excel

The dataset showcases students’ *“Name”*, *“Mid Term 1”*, *“Mid Term 2”* and *“Final” *marks. Exam values in **B13:E13** are in percentage.

** Steps**:

- Enter the formula into
**F5**>> press**ENTER**>> drag the**Fill Handle**to copy the formula to the cells below.

`=SUMPRODUCT(C5:E5,$D$13:$F$13)/SUM($D$13:$F$13)`

**C5:E5** points to the marks scored by *“Zoe”*, whereas **D13:F13** indicates the *“Weightage in Percentage”*. The **SUMPRODUCT** function yields the summation of the products of the marks scored in*“Mid Term 1”*, *“Mid Term 2”* and *“Final”* exams and their *“Weightage in Percentage”* values.

*Note:**Use **Absolute Cell Reference** by pressing the F4.*

**Read More: **How to Calculate Periodic Interest Rate in Excel

## Practice Section

**Practice** here.

**Download Practice Workbook**

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