Blended Interest Rate Calculator

When you carry multiple loans or savings accounts at once — a mortgage, a car loan, a personal loan — each comes with its own interest rate. A blended interest rate, also called a weighted average interest rate, merges all of those individual rates into one representative number that reflects your true overall cost of borrowing or return on savings. It is calculated as the sum of each balance multiplied by its rate, divided by the total balance. For example, a $10,000 loan at 4% combined with a $5,000 loan at 7% produces a blended rate of 5.00% — one clean figure instead of two rates you have to mentally juggle.

The Blended Interest Rate Calculator handles this computation in real time across as many accounts or loans as you need. As you enter each balance and its corresponding rate, the tool immediately updates the total combined balance, the blended interest rate, and a step-by-step breakdown showing exactly how each account’s contribution feeds into the final result. There is no formula to memorize and no spreadsheet to build.

To use it, enter a balance and interest rate for your first account, then click “Add Account” for each additional loan or savings account you want to include. Results recalculate live after every change. Use the trash icon to remove any entry, and use your browser’s Print → Save as PDF option to export a clean single-page record when you’re done.

This tool is useful for borrowers who want to see whether consolidating multiple loans would actually lower their rate, homeowners combining a mortgage and a HELOC into one figure, investors tracking the average yield across several savings accounts or fixed deposits, and financial planners who need to present clients with a single summarized rate across a complex portfolio. Most people underestimate how much a blended rate can differ from their highest or lowest individual rate — a large low-rate loan can quietly pull the average down, while a small high-rate balance can drag it back up. Knowing your actual blended rate removes that blind spot and helps you make smarter decisions about payoff priority, refinancing, and debt consolidation.