Consolidated Loan Repayment Schedule Calculator

A consolidated loan repayment schedule estimates the monthly payment and total interest when several debts are combined into one balance at a single assumed APR and term. Enter the combined loan amount, annual interest rate, and repayment term to see the level monthly payment and interest calculated over the full schedule.

Formula

The calculator treats consolidation as one fixed-rate installment loan with equal monthly payments. It uses the standard amortizing-payment formula:

Payment = round(P × r ÷ [1 − (1 + r)⁻ⁿ], 2)

• P is the combined amount borrowed, in dollars.
• r is the monthly interest rate, calculated as annual APR ÷ 1,200. For an 8% APR, r = 0.08 ÷ 12, or 0.0066667 per month.
• n is the number of monthly payments, calculated as years × 12.
• Payment is rounded to the nearest cent. Estimated total interest is the rounded monthly payment multiplied by the number of months, minus the original balance.

The formula assumes the same payment is due each month and that interest accrues on the unpaid balance. The first output is the estimated monthly payment; total interest is a second, related estimate. It is not a lender-generated payment schedule with individual dates or daily interest calculations.

Worked Example

Using the defaults above: a $20,000 consolidated balance, 8% APR, and a five-year term.

1. Convert APR to a monthly rate: 8 ÷ 1,200 = 0.0066667.
2. Convert the term to payments: 5 × 12 = 60 months.
3. Insert the values: $20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = approximately $405.53 per month, rounded to cents.
4. Calculate total paid using that rounded payment: $405.53 × 60 = $24,331.80.
5. Subtract the starting balance: $24,331.80 − $20,000 = $4,331.80 estimated total interest.

Results can differ by a cent or more from a lender’s figures because a lender may use unrounded internal amounts, different payment dates, or other terms. The example does not add any fees to the balance.

Assumptions

• The APR stays fixed for the entire repayment term.
• Payments are equal, made monthly, and applied at regular intervals; the calculation does not model a specific first due date.
• Interest is compounded monthly at APR ÷ 12.
• Fees, taxes, insurance, PMI, escrow, late charges, and optional add-ons are not included. If a fee is financed, include it in the amount only when estimating that larger balance.

What a Consolidated Repayment Schedule Shows

Consolidation replaces multiple balances with a new combined balance under one repayment arrangement. The new schedule is a projection of how that single balance would be paid down over time. In a full amortization table, each payment is divided between interest and principal: early payments generally devote a larger share to interest, while the principal share grows as the balance falls.

This calculator summarizes the schedule rather than listing every month. For a basic fixed-rate loan, the monthly payment is level, but the interest portion is not. A lender’s statement or amortization table can show the opening balance, payment, interest, principal reduction, and closing balance for each period.

“Consolidation” does not necessarily mean every debt is included or that the new loan has the same terms as the old accounts. The amount entered should represent the balance being financed, not the sum of unrelated debts left outside the arrangement. Get the proposed loan amount, APR, term, and any financed charges from the lender’s disclosure before using the estimate to understand a specific offer.

How to Use and Read the Estimate

• Combined loan amount: Enter the amount the new loan would repay or finance. Check whether the quote includes accrued interest or charges.
• APR: Enter the annual percentage rate as a number, such as 8 for 8%. Use the rate for the proposed consolidated loan, not an average of the old accounts unless that is specifically the rate being modelled.
• Term: Enter the repayment length in years. A term with a fraction is accepted within the input range; the formula converts it to years × 12.
• Outputs: Compare the estimated monthly payment with the total interest over the entered term. Total interest is not the same as total paid; add the principal to it to estimate total payments under the model.

For instance, a longer term generally spreads repayment across more installments and changes both the monthly amount and the total interest. This is a mathematical effect of the inputs, not a prediction about a particular offer. To examine alternatives, change one input at a time and note that actual lender terms may not be available for every combination.

Comparing Consolidation With Existing Debts

A useful comparison requires more than looking at one monthly payment. List the balances being considered, their required payments, rates, remaining terms, and any charges associated with paying them off or opening the new loan. Then compare the proposed consolidated loan’s payment and total scheduled payments over its full term with the remaining payments on the debts it would replace. Use the same assumptions about which balances and costs are included.

A lower monthly payment alone does not prove that the borrowing cost is lower: it may result from extending repayment over more months. Conversely, a quoted payment that looks similar to the current combined payments does not reveal how much of each payment reduces principal. The calculator estimates only the new loan’s fixed-payment arithmetic; it does not calculate the payoff schedules for the old debts or account for changes in how separate accounts are used afterward.

Common Problems and Limits

• Entering a monthly rate as APR: The input expects annual APR in percent. Entering 0.67 to represent a monthly rate of about 0.67% would make the modeled annual APR 0.67%, not 8%.
• Using the wrong balance: If the consolidation loan includes only some debts, entering all outstanding debt overstates the modeled amount. If the new loan finances charges, omitting them understates the amount financed.
• Confusing interest with total repayment: Total interest is the estimated cost of interest in this model. Estimated total payments equal the principal plus interest.
• Assuming the estimate is a contract quote: Payment timing, rounding conventions, variable rates, fees, and other loan-specific details can change the actual schedule.

The formula does not model variable APRs, irregular payments, skipped or late payments, extra principal payments, prepayment charges, changing balances, or multiple rates. It also cannot establish whether a lender will offer particular terms. Obtain the actual loan figures and repayment schedule from the lender and confirm what debts, charges, and payment dates are included.

Frequently Asked Questions

How do I calculate a consolidated loan payment?
Combine the amount to be financed, convert annual APR to a monthly rate by dividing by 1,200, and apply the amortizing-payment formula for the number of monthly installments. This calculator performs those steps and rounds the payment to cents.

Does a lower monthly payment mean I pay less overall?
Not necessarily. A longer repayment term can lower the scheduled monthly payment while increasing the number of months interest accrues. Compare total payments and the complete terms, not only the monthly amount.

Does this calculator include consolidation fees?
No. It excludes fees and other charges. If a charge is included in the amount financed, adding it to the loan amount will show its effect on the estimated payment and interest, but the calculator does not determine what charges apply.

Can I use this for a variable-rate consolidated loan?
Only as a fixed-rate illustration for the APR entered. A variable rate can change, so the actual payment or repayment timeline may differ from this estimate.

Why might my lender’s payment differ?
The lender may use exact payment dates, a different interest-accrual method, additional financed amounts, or different rounding rules. The lender’s disclosure and schedule provide the figures for the specific loan.

This result is an estimate, and the lender’s disclosure gives the exact figures.

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in p | Combined loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2