Some older federal student loans have a variable interest rate. If you have a variable rate student loan, your interest rate can go up or down over time. Direct Consolidation Loans have a fixed interest rate, meaning your interest rate will not change over the life of the loan.
The fixed interest rate for a Direct Consolidation Loan is the weighted average of the interest rates of the loans being consolidated, rounded up to the nearest one-eighth of a percent. While consolidating your loans may slightly increase your interest rate, it will lock you into a fixed interest rate, so your new payment going forward won’t change.