Blended Rate Calculator

A blended rate is the weighted average interest rate of two or more loans. It combines multiple loan balances and rates into one simplified rate that reflects the total cost of borrowing.

Blended Rate Calculator

Calculate the true weighted average interest rate across multiple loans or debts to evaluate debt consolidation options accurately.

Enter Your Debts
Loan Name (Optional) Balance ($) Interest Rate (%)
Weighted Average (Blended) Rate
0.00%
Based on total debt of $0
Interest Weight Distribution
Consolidation Analysis
Detailed Loan Breakdown
LoanBalanceWeight (%)RateAnnual Interest

What is a Blended Rate?

A blended rate is the weighted average interest rate calculated across multiple loans or debt instruments. Unlike a simple average—which treats all loans equally regardless of size—a blended rate factors in the principal balance of each loan. Loans with higher balances exert more influence (weight) on the final blended rate than smaller loans.

In personal finance, calculating a blended rate is the most mathematically accurate way to understand the true cost of your combined debt. It is commonly used to determine whether debt consolidation will actually save money.

Blended Rate Formula

To calculate a blended rate, you multiply each loan's interest rate by its outstanding balance, sum those totals together, and divide by the total aggregate debt.

Blended Rate = (Loan 1 Balance × Rate 1 + Loan 2 Balance × Rate 2 + ...) / Total Balance Example: Loan A: $10,000 at 15% (Weight: $1,500) Loan B: $40,000 at 5% (Weight: $2,000) Total Balance: $50,000 Blended Rate = ($1,500 + $2,000) / $50,000 = 0.07 or 7.00%

Why You Shouldn't Use a Simple Average

If you simply averaged the rates in the example above (15% + 5% / 2), you would get 10%. However, because the 5% loan is four times larger than the 15% loan, the true cost of your debt is heavily pulled toward the lower rate. The actual blended rate is 7%. Using a simple average creates a false sense of your debt cost and can lead to poor financial decisions, such as taking out a consolidation loan at 9% thinking you are saving money, when in reality, you are losing money.

Primary Use Cases for a Blended Rate

1. Debt Consolidation Analysis

Before merging credit cards, personal loans, and medical bills into a single consolidation loan, calculate your current blended rate. If a lender offers you a consolidation loan at a rate lower than your blended rate, consolidation will save you money on interest. If the offered rate is higher, you should not consolidate.

2. Combining First and Second Mortgages

Homeowners often have a primary mortgage at one rate and a Home Equity Line of Credit (HELOC) or second mortgage at a different, usually higher, rate. The blended rate tells them their effective borrowing cost across the total property debt.

3. Corporate Finance and WACC

In business, companies calculate a blended rate across all their debt instruments (bonds, bank loans, credit lines) to determine their cost of debt. This is a core component of calculating the Weighted Average Cost of Capital (WACC).

Step-by-Step Guide to Using This Calculator

  1. List all debts: Enter the exact outstanding balance and the exact annual percentage rate (APR) for each debt.
  2. Add rows as needed: Use the "Add Another Loan" button to input as many debts as necessary.
  3. Calculate: The engine instantly computes the weighted average.
  4. Analyze: Use the built-in consolidation tool to input a hypothetical new interest rate and see exactly how much you would save or lose in annual interest.

Frequently Asked Questions

Is a blended rate the same as an average interest rate?
No. A simple average treats all loans equally. A blended rate (weighted average) accounts for the size of each loan. A $50,000 loan at 5% and a $1,000 loan at 20% do not average to 12.5%; they blend to roughly 5.29% because the massive size of the first loan dominates the calculation.
Does a lower blended rate mean I have good debt?
Not necessarily. A low blended rate simply means the majority of your debt is tied up in low-interest loans (like mortgages or subsidized student loans). However, if you have even a small amount of high-interest credit card debt, it is usually financially advantageous to aggressively pay that down first, regardless of the overall blended rate.
How does debt consolidation affect my blended rate?
Consolidation replaces all your individual loans with one new loan at a single rate. That new rate becomes your new blended rate (since it's 100% of your debt). If the new rate is lower than your calculated blended rate, you will save money on interest and potentially pay off the debt faster.
Do I include 0% APR loans in a blended rate calculation?
Yes. Including a 0% loan (like a promotional credit card balance) will mathematically lower your overall blended rate. However, be aware that when the 0% period expires, the rate will jump. You should calculate two scenarios: one with the 0% rate, and one with the projected post-promotional rate, to plan accurately.
What is a good blended rate for debt?
Generally, a blended rate below 7-8% is considered very good for consumer debt, as it indicates most of the debt is tied to secured assets (like real estate or vehicles) rather than unsecured credit cards. If your blended rate is above 10%, it usually signals a heavy presence of high-interest credit card debt that should be addressed.

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