Personal Loan Calculator
Calculate your estimated monthly payment, total interest charges, and early payoff date for unsecured personal loans with optional origination fees and extra principal payments.
| Year | Annual Payment | Principal Paid | Interest Paid | Ending Balance |
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How to Use This Calculator
- Enter Your Loan Principal: Specify the total funding amount you need (e.g., $10,000 for debt refinancing, home repairs, or unexpected medical expenses).
- Select or Enter Your Interest Rate (APR): Input your quoted rate or click one of the credit tier preset buttons (Excellent, Good, Fair, or Building Credit) to test realistic market APRs.
- Choose Your Repayment Term: Select how many months you will take to pay off the loan. Shorter terms (24 to 36 months) lower total interest; longer terms (48 to 60 months) reduce your required monthly bill.
- Account for Origination Fees & Extra Payments: If your lender charges an upfront processing fee (typically 1% to 6%), see whether it reduces your cash in hand or increases your debt. Test adding extra monthly payments to see your interest savings and accelerated payoff date.
The Formula
Unsecured personal loans use standard fixed-rate amortization formulas to determine level monthly installments throughout the term.
1. Monthly Installment Formula (Amortization)
Where:
- PMT: Required monthly payment
- P: Gross principal borrowed (or net amount plus financed fees)
- r: Monthly interest rate (annual APR ÷ 12)
- n: Total term in months
2. Total Interest & Borrowing Cost
Total Out-of-Pocket Cost = (PMT × n) + Upfront Fees
3. Cash Received in Hand
Example: Borrowing a $10,000 Personal Loan
Suppose you take out a $10,000 personal loan at an 11.50% APR over a 36-month term (3 years) with a 3.0% origination fee ($300.00) deducted from disbursement:
- Gross Loan Amount: $10,000.00
- Cash Delivered to Account: $9,700.00 ($10,000 minus the $300 upfront fee)
- Base Monthly Payment: $329.76 per month
- Total Standard Interest: $1,871.36 over 36 months
- Total Cash Paid: $11,871.36
The Power of Extra Payments: If you voluntarily pay an extra +$50.00 per month ($379.76 total payment):
- Your loan pays off in 31 months instead of 36 months (debt-free 5 months sooner).
- Your total interest drops to $1,580.09, saving you $291.28 in cash.
Frequently Asked Questions
What interest rate can I expect on a personal loan?
Personal loan interest rates generally range from 7% to 36% depending heavily on your credit score, income, and debt-to-income ratio. Borrowers with excellent credit (720+) often receive fixed APRs between 8% and 13%, while borrowers with fair or building credit typically see rates between 18% and 28%.
How does loan term length affect my monthly payment and total interest?
A shorter repayment term (e.g., 2 to 3 years) increases your monthly payment but drastically cuts the total interest paid over the life of the loan. A longer term (e.g., 5 to 7 years) lowers your required monthly installment, making it easier on short-term cash flow, but substantially increases total lifetime interest costs.
What is a personal loan origination fee and how is it paid?
An origination fee is an upfront administrative charge levied by the lender to process your loan, typically between 1% and 8% of the loan amount. Most lenders deduct this fee directly from your loan payout before transferring cash to your bank account, meaning you receive less than the gross principal amount borrowed.
How much interest can I save by making extra monthly principal payments?
Because personal loans amortize monthly, any additional payment applied directly to your principal balance reduces the interest accrued in every subsequent month. Even an extra $50 to $100 per month can eliminate several months off your repayment term and save hundreds or thousands in finance charges.
Will using an online personal loan calculator affect my credit score?
No. Using GrabCalc's in-browser personal loan calculator has zero impact on your credit score because all computations run entirely on your device with no credit check, soft pull, or bank account connection required.