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Unpaid Balance Calculator

Use our free Unpaid Balance Calculator to find your remaining credit card balance, finance charges, and unpaid principal balance in seconds.

Formula: UB = PB + (PB × r) − PM + AP — Calculates the full unpaid balance including interest, payments, and new purchases.
$
Your balance at the end of the last billing cycle.
%
APR (annual) — will be divided by 12 for monthly rate.
$
Total payments applied this billing period.
$
New charges added during the billing period. Leave blank if none.

Our Unpaid Balance Calculator helps you find the amount you still owe after making a payment. It is useful for credit cards, loans, mortgages, and other forms of debt.

You can use this tool to calculate your unpaid balance, unpaid principal balance, and finance charges in just a few seconds.

The calculator is simple to use. Enter your previous balance, interest rate, payment amount, and any new purchases. The tool will instantly show your remaining balance.

If you want to understand the unpaid balance method, this guide explains everything in easy words.

What Is the Unpaid Balance Method?

The unpaid balance method is a way lenders use to calculate interest.

First, they subtract your payment from your previous balance. Then they apply interest to the remaining amount.

This method can lower your finance charges because interest is charged only on the balance left after your payment.

Many credit card companies and lenders use this method to calculate finance charges.

Unpaid Balance Formula

The formula for unpaid balance is:

Unpaid Balance = Previous Balance + Interest − Payments Made + Additional Purchases

Where:

  • Previous Balance = Balance from the last billing cycle
  • Interest = Previous Balance × Monthly Interest Rate
  • Payments Made = Amount you paid
  • Additional Purchases = New charges during the period

Interest Formula

Interest = Previous Balance × Monthly Interest Rate

Monthly Interest Rate Formula

Monthly Interest Rate = APR ÷ 12 ÷ 100

Unpaid Principal Balance Formula

For loans and mortgages, the unpaid principal balance formula is:

Unpaid Principal Balance = Original Loan Amount − Total Principal Paid

This formula shows how much of the original loan amount is still unpaid.

How to Use the Online Unpaid Balance Calculator

Using our calculator is very easy.

  1. Enter the Previous Balance
  2. Enter the Interest Rate
  3. Enter Payments Made
  4. Enter Additional Purchases
  5. Click Calculate

The calculator will show your unpaid balance and finance charge instantly.

Example Unpaid Balance Calculation

Suppose you have the following values:

  • Previous Balance = $1,000
  • APR = 24%
  • Payments Made = $300
  • Additional Purchases = $150

Step 1: Convert APR to Monthly Rate

Monthly Rate = 24 ÷ 12 ÷ 100 = 0.02

Step 2: Calculate Interest

Interest = $1,000 × 0.02 = $20

Step 3: Calculate Unpaid Balance

Unpaid Balance = $1,000 + $20 − $300 + $150

Unpaid Balance = $870

Your remaining unpaid balance is $870.

Example Finance Charge Using the Unpaid Balance Method

Suppose:

  • Previous Balance = $800
  • Payment = $200
  • Monthly Rate = 1.5%

Step 1: Find Remaining Balance

Remaining Balance = $800 − $200 = $600

Step 2: Calculate Finance Charge

Finance Charge = $600 × 0.015 = $9

Your finance charge is $9.

Final Verdict

Our Unpaid Balance Calculator is a fast and accurate tool for calculating the amount you still owe.

Whether you need to calculate credit card balances, unpaid principal balances, or finance charges, this calculator gives instant results.

It is simple, free, and easy to use.

Enter your numbers and find your unpaid balance in seconds.

FAQs

What is the unpaid balance method?

It is a method that calculates interest based on the remaining balance after your payment is subtracted.

How do I calculate unpaid balance?

Use this formula:

Unpaid Balance = Previous Balance + Interest − Payments Made + Additional Purchases

What is an unpaid principal balance?

It is the remaining amount of the original loan that has not been paid.

Is unpaid balance the same as current balance?

No. Current balance may include new charges and fees.

Can I use this calculator for loans?

Yes. The calculator works for credit cards, mortgages, and personal loans.

How is finance charge calculated?

Finance Charge = Unpaid Balance × Monthly Interest Rate

Why is my unpaid balance lower than my statement balance?

Because your statement balance may include new transactions and fees.

Is this calculator free?

Yes. Our online Unpaid Balance Calculator is completely free to use.