Calculate Your Blended Interest Rate
Enter each balance and its annual interest rate. This tool computes the weighted average (blended) rate across all entries.
Tip: If a row has both fields blank, it is ignored. If one field is filled, the row must be completed to calculate.
What Is a Blended Rate?
A blended rate is the weighted average interest rate across multiple balances. It gives you one clear number that summarizes your overall cost of borrowing (or return, in investing scenarios).
Instead of taking a simple average of rates, a blended rate gives more weight to larger balances. That matters because a $20,000 loan at 5% affects you more than a $500 balance at 20%.
Blended Rate Formula
The formula is:
Blended Rate = (Sum of (Balance × Rate)) ÷ (Sum of Balances)
When rates are entered as percentages, the result is also a percentage.
Quick Example
- Loan A: $10,000 at 5%
- Loan B: $5,000 at 10%
Weighted total = (10,000 × 5) + (5,000 × 10) = 50,000 + 50,000 = 100,000
Total balance = 15,000
Blended rate = 100,000 ÷ 15,000 = 6.67%
When to Use a Blended Rate Calculator
1) Debt Payoff Planning
If you carry multiple debts (credit cards, personal loans, auto loan), the blended rate helps you estimate your current effective borrowing cost.
2) Refinance Decisions
Compare your current blended rate against a new consolidation or refinance offer. If the offer is materially lower after fees, it may reduce total interest expense.
3) Business Financing
Companies often have different debt facilities with different rates. A blended rate is useful for budgeting and evaluating financing strategy.
4) Portfolio Yield Snapshot
The same math can be used for weighted return estimates across income-generating assets.
How to Get More Value from This Number
- Track it monthly: Watch your blended rate over time as you pay off balances.
- Prioritize high-rate debt: Reducing expensive balances can pull down the overall rate faster.
- Run scenarios: Test what happens if you refinance one loan or pay off one card.
- Pair with payoff horizon: A lower blended rate is great, but time to debt-free matters too.
Common Mistakes to Avoid
- Using a simple average of rates instead of a weighted average.
- Mixing annual and monthly rates in one calculation.
- Ignoring fees when evaluating consolidation offers.
- Treating blended rate as the only metric—cash flow and term length matter too.
Bottom Line
A blended rate calculator turns a messy set of balances into one actionable number. Use it to benchmark your debt, compare refinancing options, and stay intentional about the true cost of your financial obligations.