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How to Use This Calculator
This blended rate calculator makes it simple to find your true weighted average interest rate across all your debts:
- Enter each loan balance — the current outstanding balance you owe on each debt.
- Enter the interest rate — the annual interest rate (APR) for each loan.
- Add more loans — click "Add Another Loan" to add up to 10 debts.
- Calculate — get your blended rate, total balance, and annual interest cost instantly.
💡 Common use case: Use this calculator before refinancing or consolidating debt. If a lender offers you a consolidation loan at a lower rate than your blended rate, refinancing will save you money. If the offered rate is higher, it's not worth consolidating.
What Is a Blended Interest Rate?
A blended interest rate — also called a weighted average interest rate — is a single rate that represents the true average cost of multiple loans or debts combined. Unlike a simple average, it accounts for the size of each loan so that larger balances have more influence on the final rate.
For example, if you have a $50,000 student loan at 5% and a $2,000 credit card at 20%, your blended rate will be much closer to 5% than to 20% — because the student loan makes up the vast majority of your total debt.
The Blended Rate Formula
Blended Rate = Σ(Balance × Rate) ÷ Total Balance
Example with 3 loans:
• $15,000 at 6.5% = $975
• $8,000 at 18.99% = $1,519.20
• $5,000 at 4.25% = $212.50
Total: $28,000 balance, $2,706.70 weighted interest
Blended Rate = $2,706.70 ÷ $28,000 = 9.67%
• $15,000 at 6.5% = $975
• $8,000 at 18.99% = $1,519.20
• $5,000 at 4.25% = $212.50
Total: $28,000 balance, $2,706.70 weighted interest
Blended Rate = $2,706.70 ÷ $28,000 = 9.67%
When Is the Blended Rate Useful?
- Debt consolidation decisions — compare your blended rate against consolidation loan offers
- Student loan refinancing — calculate if refinancing multiple federal loans makes financial sense
- Mortgage analysis — combine first and second mortgage rates to find true housing cost
- Business loan management — understand the true cost of multiple business credit lines
- Financial planning — set a target rate for any new debt you take on
Frequently Asked Questions
Is blended rate the same as APR?
Not exactly. APR (Annual Percentage Rate) includes fees and other costs in addition to the interest rate for a single loan. A blended rate is a weighted average of multiple interest rates across several loans. However, if all your individual loan rates are stated as APR, then your blended rate gives you a combined APR-equivalent across all your debts.
Should I consolidate my debt if my blended rate is high?
If you can find a consolidation loan at a rate lower than your blended rate, consolidating can save money and simplify payments. However, also consider: loan term length (a lower rate over a longer term can cost more total interest), any prepayment penalties on existing loans, origination fees on the new loan, and whether fixed or variable rates are better for your situation.
How is blended rate used in mortgage situations?
Homeowners with both a primary mortgage and a home equity loan or HELOC can calculate their blended mortgage rate. This helps determine if refinancing into a single new mortgage at a different rate makes financial sense. It also helps compare the true cost of different home financing structures.
Does the blended rate account for compounding?
The basic blended rate formula gives you a simple weighted average of stated annual rates. It does not account for compounding frequency differences between loans. For a more precise calculation when loans have different compounding schedules, you would need to convert each rate to its effective annual rate (EAR) before blending.
What is the difference between blended rate and average rate?
A simple average treats all loans equally regardless of size. A blended rate (weighted average) gives more weight to larger balances. For example, if you have a $100,000 loan at 5% and a $1,000 loan at 25%, the simple average is 15% — but the blended rate is about 5.2%, which much more accurately reflects your true interest burden.
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