Loan Repayment Calculator:
See Your Real Monthly Payment
Before You Borrow

Our free loan repayment calculator shows you exactly what any personal loan, installment loan, or payday loan will cost — monthly payment, total interest, and the full amount you’ll repay — before you sign a thing. Use it above, then read on to understand every number it generates.

What Is a Loan Repayment Calculator?

A loan repayment calculator is a financial tool that computes your fixed monthly payment for any loan using three inputs: the principal (the amount borrowed), the loan term (how many months you’ll repay), and the annual percentage rate (APR). It applies the standard loan amortisation formula to give you an accurate monthly figure rather than an estimate.

Beyond the monthly payment, a good calculator also reveals your total repayable amount — principal plus all interest — and the total interest cost expressed in dollars and as a percentage of the original loan. These two figures are the ones most lenders downplay in their advertising, yet they represent the true cost of borrowing.

How to Use Our Loan Repayment Calculator

The calculator above has four inputs. Here’s what each one does and how to set it accurately:

1. Loan Amount

Drag the slider to the amount you need to borrow. Our panel covers $100 to $50,000. A core principle of responsible borrowing: always enter the minimum amount you genuinely need. Every extra $100 borrowed at 35% APR over 12 months costs roughly $20 in interest. Small amounts add up over time.

2. Loan Term

The loan term is the number of months over which you repay. A longer term means a lower monthly payment — but significantly more total interest paid. A shorter term costs more each month but far less overall. The calculator shows this trade-off in real time as you move the slider.

3. Interest Rate (APR)

APR — annual percentage rate — is the standardised cost of borrowing expressed as a yearly percentage. It includes interest and mandatory fees, making it the only reliable way to compare loans from different lenders. Our panel’s APR range runs from 5.99% to 99.9%. If you haven’t yet applied, use 24.9%–35.9% as a realistic estimate for fair-credit borrowers on short-term personal loans.

4. Loan Purpose

Selecting a purpose unlocks our AI tip engine, which generates tailored debt advice based on your specific situation — whether you’re covering a medical emergency, consolidating debt, or repairing a car. The purpose doesn’t affect your calculated repayment figure; it personalises the guidance beneath it.

Understanding Your Results: Monthly Payment, Total Cost & Interest

Once you’ve set your inputs, the calculator outputs four figures. Here’s what each means:

• Monthly payment — The fixed amount you pay each month for the duration of the loan. This is calculated using the standard amortisation formula and assumes a fixed interest rate throughout.
• Total repayable — The full amount you’ll pay back to the lender, including both the original principal and all accumulated interest. This is the most important number when comparing loan offers.
• Total interest — The difference between total repayable and your original loan amount. In dollar terms, this is what borrowing costs you.
• Interest as % of loan — Total interest expressed as a percentage of the principal. A figure above 30% is a signal to either reduce your term, shop for a lower APR, or both.

The cost breakdown bar below the results visualises how much of your total repayable amount is principal (what you borrowed) versus interest (the cost of borrowing). For short-term, lower-APR loans, the bar should be predominantly blue. If you’re seeing more than 40% amber, the loan is expensive and worth reconsidering.

Personal Loan vs Installment Loan vs Payday Loan: Which Calculator Do You Need?

All three loan types use the same underlying repayment formula — principal, rate, term — but they differ significantly in typical APR, term length, and total cost. Our single calculator handles all three. Here’s how they compare:

When comparing offers, always enter the actual APR quoted by the lender — not the “representative rate” in advertising, which only needs to apply to 51% of successful applicants. Your actual rate may be higher depending on your credit profile.

The Amortisation Formula: How Monthly Payments Are Calculated

If you’ve ever wondered how lenders arrive at a fixed monthly payment, the answer is the loan amortisation formula. Our calculator uses it exactly:

This formula produces a fixed payment amount that remains constant throughout the loan. In the early months, a larger share of each payment goes toward interest; as the balance decreases, more goes toward principal. This is called negative amortisation protection — by the final payment, you owe nothing.

For a 0% interest loan (rare, but offered by some buy-now-pay-later providers), the formula simplifies to monthly payment = principal ÷ months. Our calculator handles this edge case automatically.

5 Ways to Reduce the Total Cost of Your Loan

Before you apply, use the calculator to test these five tactics. Each one can materially reduce how much you pay:

1. Shorten the term. Reducing from 36 months to 24 months on a $3,000 loan at 29.9% APR saves approximately $500 in interest. The monthly payment rises, but the total cost falls sharply.
2. Borrow less. Only borrow what you need. If you need $1,800 to cover an expense, don’t round up to $2,000. That extra $200 at 35% APR over 18 months costs around $64 in interest — for money you didn’t need.
3. Shop for a lower APR. A 5% reduction in APR on a $5,000 loan over 24 months saves approximately $250–$300 in interest. Use our lender matching to compare offers side by side.
4. Make overpayments if allowed. Most installment lenders allow early or overpayments without penalty. Paying even $20 extra per month on a $2,000 loan can reduce the effective term by 2–3 months.
5. Consolidate high-APR debt. If you have multiple loans or credit cards at 40–60% APR, consolidating into a single personal loan at 20–25% APR can save hundreds or thousands of dollars annually. Use the calculator to model both scenarios before you apply.

What APR Should You Expect? Credit Score vs Rate Guide

Your credit score is the primary factor lenders use to determine your APR. Here’s a general guide to expected rates across lenders similar to those on our panel:

If you fall into the poor or very poor category, don’t be discouraged. Several lenders on our panel make decisions based primarily on income and banking history, not credit score. Same-day funding is available for all credit types. Use the calculator with a realistic APR for your bracket before applying — and if the total cost looks high, a shorter term keeps the interest manageable.

Loan Calculator for Debt Consolidation: Does It Save Money?

Debt consolidation — taking out a single new loan to pay off multiple existing debts — is one of the most effective uses of a loan repayment calculator. Here’s how to model it:

1. List your current debts. Note the outstanding balance, APR, and monthly payment for each. Add up the total monthly payments and the total outstanding balance.
2. Calculate your current total interest. For each debt, multiply the monthly payment by the remaining months and subtract the outstanding balance. Sum these figures across all debts.
3. Model the consolidation loan. Enter the total outstanding balance as the new loan amount. Use the APR you expect to qualify for. Try different terms until the monthly payment is lower than your current combined payments.
4. Compare total interest costs. If the new loan’s total interest is lower than the sum of your existing debts’ remaining interest, consolidation saves you money.

Same-Day Loans: What to Know Before You Calculate

Same-day loans — a category that includes payday loans, tribal loans, and fast-turnaround installment loans — are specifically designed for urgent financial needs. They come with higher APRs than traditional personal loans because they carry more risk for lenders and are processed faster. Before using our calculator for a same-day loan:

• Use a short term. Same-day loans are most cost-effective over 1–6 months. Extending them to 18–24 months turns a manageable borrowing cost into an expensive commitment.
• Check the total, not just the monthly. A $500 same-day loan at 99% APR over 3 months has a monthly payment of around $177. Total repayable: $531. That’s a reasonable cost for fast access to funds. The same loan stretched to 12 months costs $640 total — 28% more.
• Understand decision speed vs funding speed. “2-minute decision” means you receive a credit decision quickly. Actual funds transfer typically takes 1–24 hours depending on the lender and your bank’s processing times.
• No credit check doesn’t mean no assessment. Tribal and payday lenders that skip hard credit checks still assess your income, employment, and banking history. Having a regular income deposited into a checking account is typically required.

Loan Repayment Calculator vs APR Calculator: What’s the Difference?

These terms are often used interchangeably, but they calculate different things:

• A loan repayment calculator takes a known APR and calculates the monthly payment and total cost. You know the rate; you want the payment.
• An APR calculator works in reverse: you know the monthly payment and loan term, and you want to calculate the implied APR. This is useful when a lender quotes a weekly or monthly rate instead of an annual one — a common tactic in short-term lending that obscures the true cost.

If a lender quotes you a “3% monthly rate,” that sounds low — but it translates to an APR of approximately 42.6%. Always convert to APR before using our calculator to ensure you’re comparing like for like.

Frequently Asked Questions