Blended Rate Calculator
Calculate weighted average interest rate for multiple loans, mortgages, or investments. Essential for debt consolidation, refinancing decisions, and portfolio analysis.
| Loan A (Balance/Rate) | Loan B (Balance/Rate) | Loan C (Balance/Rate) | Blended Rate |
|---|---|---|---|
| $10,000 @ 5% | $20,000 @ 7% | — | 6.33% |
| $15,000 @ 4.5% | $25,000 @ 6.5% | $10,000 @ 8% | 6.08% |
| $5,000 @ 12% | $15,000 @ 8% | $30,000 @ 5% | 6.70% |
| $200,000 @ 4.5% | $50,000 @ 7% | — | 5.00% |
Blended Rate Calculator: The Complete Expert Guide to Weighted Average Interest Rates
As a financial analyst with over 15 years of experience in debt restructuring, mortgage refinancing, and investment portfolio management, I’ve seen countless borrowers and investors make suboptimal decisions because they didn’t understand their true blended interest rate. The blended rate calculator is an essential tool that reveals the weighted average cost of debt or return on investments — information that directly impacts refinancing decisions, debt consolidation strategies, and portfolio optimization.
What Is a Blended Rate?
A blended rate (also called weighted average interest rate) is the single interest rate that represents the combined cost of multiple loans or the combined return of multiple investments. It accounts for both the interest rate and the balance/weight of each component. The formula is:
Blended Rate = Σ(Loan Balance × Interest Rate) ÷ Σ(Total Balance)
For example, if you have Loan A: $10,000 at 5% and Loan B: $20,000 at 7%, the calculation is: ($10,000×0.05 + $20,000×0.07) ÷ $30,000 = ($500 + $1,400) ÷ $30,000 = $1,900 ÷ $30,000 = 0.06333 or 6.33% blended rate.
Why Your Blended Rate Matters
Understanding your blended rate impacts three critical financial decisions:
1. Debt Consolidation Decisions: If your current blended rate is 8.5% and a consolidation loan offers 6%, you’ll save thousands in interest. If the offer is 8.9%, consolidation actually increases your cost.
2. Mortgage Refinancing: When you have a first mortgage at 4.5% and a second mortgage at 7.5%, your blended rate might be 5.2%. A refinance offer at 5.5% would increase — not decrease — your effective rate.
3. Investment Portfolio Evaluation: A portfolio with $50,000 earning 10%, $30,000 earning 5%, and $20,000 losing 2% has a blended return of 5.8% — critical for benchmark comparison.
How to Use This Blended Rate Calculator
Step 1 — Standard Mode: Enter each loan’s outstanding balance and interest rate. Click “Add Another Loan” for up to 10 loans. The calculator instantly computes your weighted average blended rate.
Step 2 — Consolidation Mode: Enter your current blended rate (from Step 1), the proposed new consolidation rate, total balance, and loan term. The calculator shows total interest savings or additional cost over the loan term.
Step 3 — Portfolio Mode: Enter each investment’s value and expected annual return. The calculator shows your portfolio’s blended return rate.
Real-World Examples
Example 1 — Credit Card Debt Consolidation: A client had three credit cards: $5,000 at 22%, $8,000 at 19%, and $12,000 at 15%. The simple average was 18.7%, but the blended rate was ($5,000×0.22 + $8,000×0.19 + $12,000×0.15) ÷ $25,000 = ($1,100 + $1,520 + $1,800) ÷ $25,000 = $4,420 ÷ $25,000 = 17.68%. A personal loan at 12% would save $1,420 annually in interest.
Example 2 — Mortgage Blending: A homeowner had a $250,000 first mortgage at 4.25% and a $50,000 HELOC at 8.5%. Blended rate = ($250K×0.0425 + $50K×0.085) ÷ $300K = ($10,625 + $4,250) ÷ $300K = 4.96%. A refinance offer at 5.25% would actually increase costs by 0.29% — a $870 annual increase.
Frequently Asked Questions (FAQs)
A blended rate (weighted average interest rate) is calculated by: (Loan1 Balance × Rate1 + Loan2 Balance × Rate2 + …) ÷ Total Balance. Example: $10K at 5% + $20K at 7% = (500+1400)/30000 = 6.33%.
Consolidate when the new loan’s interest rate is at least 1-2% below your current blended rate. Use our Consolidation Mode to calculate exact savings. Generally, if new rate is 1.5% lower, you’ll save ~$150 annually per $10,000 borrowed.
Yes — significantly. Paying off a $5,000 credit card at 22% when your other loans total $45,000 at 6% changes blended rate from 7.6% to 6.0%. The calculator shows this exact impact. Always target highest-rate debt first for maximum blended rate reduction.
A good refinance rate is typically 0.5-1% below your current blended rate. Include closing costs in your analysis. Example: Blended rate 5.5%, refinance offer 4.75% with $5,000 closing costs on $300K balance = break-even in ~3 years. Our calculator helps compare these scenarios.
Longer terms lower monthly payments but increase total interest paid. Always compare total interest, not just monthly payment. Use the consolidation mode with different terms to see the true cost difference.
*Blended rate calculations use weighted average methodology standard in financial analysis. Always consult with a qualified financial advisor for major debt or investment decisions.