Loan Consolidation Weighted Average Rate Calculator

Federal Direct Consolidation Loans use a fixed rate equal to the weighted average of your existing loans' interest rates, rounded up to the nearest 1/8 of a percentage point. Add your loans below to estimate your resulting consolidation rate.

Weighting, then rounding up

Each loan's rate counts in proportion to its balance, and the result is pushed up to the next eighth of a percentage point:

weighted average   = sum(balance x rate) / sum(balances)
consolidation rate = ceil(weighted average / 0.125) x 0.125

With the two sample loans - $10,000 at 4.5% and $8,000 at 5.8% - the weighted sum is 45,000 + 46,400 = 91,400 over an $18,000 balance, so the average is 5.0778% and the quoted rate becomes 5.125%. The rounding is always upward, never to nearest, so it costs a little every time - here 0.047 of a point, about $8.50 a year.

Why weighting changes the answer

Averaging 4.5% and 5.8% as two numbers gives 5.15%. The weighted figure is lower because more of the money sits on the cheaper loan. The gap widens as balances get lopsided: $2,000 at 7% beside $16,000 at 4.5% averages 5.75% plainly but 4.7778% by weight, rounding to 4.875%. A small loan at an alarming rate barely moves the blend.

The rate is the only thing this calculator answers. Whether consolidating is a good idea turns on things it does not model, such as what happens to credit built toward a forgiveness or repayment programme. Those rules change; check the current terms before applying.

Frequently asked questions

What interest rate do you get when you consolidate student loans?

The balance-weighted average of the loans you fold in, rounded up to the next 1/8 of a percent. On the sample loans that is 5.0778% becoming 5.125%. It sits between your existing rates by construction.

Does consolidating lower my interest rate?

No. An average cannot beat your cheapest loan, and rounding up makes it marginally worse than the true average. A lower rate comes only from refinancing with a private lender, a different product with different protections.

Why is the result not the average of my rates?

Because a $10,000 loan pulls the average five times harder than a $2,000 one. Take the plain mean of your rates and you will overstate the result whenever your larger loans are the cheaper ones.