What do I need to enter to get started?
Three inputs: your loan amount, the annual interest rate from your lender, and how long you want to repay (in months or years). Hit calculate and the results appear instantly, no sign-up and no waiting.
Estimated Payment
$531.18
/mo
Total Payments
$31,870.80
Total Interest
$6,870.80
Total Loan Cost
$31,870.80
Origination fee is treated as an upfront cost.
Effective APR: 10.00%
Cost Breakdown
See how principal, interest, and fees combine into total borrowing cost for this scenario.
Balance Over Time
Track remaining balance decline year by year based on term, rate, and extra-payment inputs.
Frequency Comparison
Biweekly saves $0.00 in interest compared with monthly.
Budget Insight
Required gross monthly income at 36% DTI: $0.00.
Daily Interest
Loan accrues $0.00 per day at the starting balance.
Amortization
Payment Schedule
| # | Period | Principal | Interest | Balance |
|---|
Standard amortization formula:
M = P * [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]
P (Principal)$25,000.00
r (Periodic Rate)0.008333
n (Payments)60
Fee Amount$0.00
FrequencyMonthly
Common Questions
General Loan FAQs
Quick answers about using this calculator and understanding your loan.
Learn more: Read the complete guide →
What kinds of loans does this calculator work for?
Any fixed-rate installment loan: personal loans, debt consolidation, home improvement financing, medical bills, education costs, or any situation where you borrow a set amount and repay in equal monthly installments.
For mortgages or auto loans specifically, use NerdCalc's dedicated Mortgage Calculator and Auto Loan Calculator for features tailored to those loan types.
How accurate are the results?
The math is precise, the same core arithmetic lenders use to build your repayment schedule. Your actual loan offer may still include fees, insurance, or rate adjustments that change the final number. Use these results as a planning baseline, then compare with official lender quotes.
Can I see how extra payments would shorten my loan?
Yes. Add a recurring or one-time extra payment amount and the calculator recalculates your payoff timeline and total interest. Even a modest increase, such as $75 or $100 per month, can remove months from your term and reduce interest charges.
What does the payment breakdown show me?
It maps every payment across the life of your loan and shows how much goes to principal versus interest. Early payments lean toward interest, then the split shifts toward principal as your balance drops.
Why is so much interest charged at the beginning?
Interest is calculated on your remaining balance. At the start, your balance is highest, so the interest portion is highest. As the balance declines, more of each payment goes to principal.
Should I go with a shorter term or a longer one?
A shorter term usually means higher monthly payments but significantly less total interest. A longer term lowers monthly payments but increases total cost. Comparing both scenarios side by side in the calculator usually makes the trade-off clear.
What is the difference between interest rate and APR?
The interest rate is the base cost of borrowing on your outstanding balance. APR includes that rate plus additional costs such as origination fees or points, giving a fuller annual cost. When comparing offers, APR is typically the better apples-to-apples metric.
Is any of my information saved or collected?
No. Every calculation runs in your browser. Nothing is stored on a server, nothing is transmitted, and no account is required.
How can I use these results when talking to a lender?
Use the results to show how a quoted rate changes your monthly payment and total interest over the full term. Enter lender quotes directly into the calculator to compare terms before you agree to an offer.
Data Integrity
Methodology and source verification
The payment math on this page is cross-checked against standard fixed-rate amortization formulas, closed-end credit APR rules, and principal-and-interest payment guidance used in federal consumer finance disclosures. The calculator estimates payment, total interest, and payoff behavior, but it does not replace a lender's binding offer, fee schedule, or product-specific disclosure package.
Verified
Reference basis: the calculation engine applies standard installment-loan amortization logic to fixed-rate repayment inputs, then adjusts totals for selected extra payments and timing assumptions. The explanatory copy is anchored to CFPB guidance on interest rate versus APR, principal-and-interest payment disclosures, and closed-end credit calculation rules under Regulation Z.
CFPB: interest rate vs. APR
Used for the distinction between quoted interest rate and APR when comparing loan offers and total borrowing cost.
Read the CFPB APR guidanceCFPB Regulation Z Appendix J
Used for the actuarial closed-end credit framework that underlies installment-loan and APR calculations.
View Appendix J to Regulation ZCFPB Loan Estimate explainer
Used for principal-and-interest payment framing and the reminder that total monthly cost can differ when additional charges apply.
Read the Loan Estimate explainerCFPB principal and interest FAQ
Used for explaining the difference between pure loan payment math and broader all-in monthly payment obligations.
See CFPB principal and interest guidance
Maximum Loan Amount
$23,573.52
Total Interest
$6,426.48
Total Cost
$30,000.00
Market Comparison
Avg. Bank Rate
11.4%
Lowering your interest rate by 0.5% increases borrowing capacity by approximately $0.