Precision Instruments · Calculator 03

Loan Calculator.

Enter your loan amount, interest rate and term to instantly calculate monthly payments, total interest and a full payoff schedule.

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Years
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Added to your total loan cost. Does not affect monthly payment formula.

The Mechanics of Leverage

Strategic debt isn't just a liability — it's a tool. Low-interest loans used for appreciating assets (education, a home, a business) can generate more wealth than the interest costs. The key is matching the rate to the return.

Good debt works for you. Bad debt costs you.
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Over — payments

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Principal + Interest

Payoff Schedule Summary

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Principal Paid
Principal — Interest —

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Payoff
Schedule.

Each row shows how much of your payment goes toward interest vs principal, and your remaining balance. Early payments are mostly interest — this shifts over time.

Halfway Point

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Total Interest

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Payoff Month

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Year Interest Paid Principal Paid Balance
Calculate your loan above to see the full payoff schedule.
Loan Guide

Understanding Different Loan Types.

person

Personal Loans

Unsecured loans for any purpose — debt consolidation, home improvement, medical bills, weddings or emergencies. No collateral needed.

Typical Rate 6–36% APR
Typical Term 2–7 years
Typical Amount $1,000–$100,000
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Auto Loans

Secured loans using the vehicle as collateral. Lower rates than personal loans because lenders can repossess the car if you default.

Typical Rate 5–15% APR
Typical Term 3–7 years
Typical Amount $5,000–$80,000
school

Student Loans

Federal or private loans for education costs. Federal loans come with income-driven repayment options and forgiveness programs.

Federal Rate 4–7% APR
Typical Term 10–25 years
Annual Limit Up to $57,500
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Business Loans

Loans to start or grow a business. SBA loans offer government-backed low rates. Requirements include business financials and a solid business plan.

SBA Rate 6–13% APR
Typical Term 1–25 years
SBA Maximum Up to $5M
home

Home Equity Loans

Borrow against your home's equity. Lower rates than personal loans because your home secures the debt. Best for large one-time expenses.

Typical Rate 6–12% APR
Typical Term 5–30 years
Max LTV 80–85%

What affects your rate?

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Credit score — the biggest factor. 720+ gets the best rates.

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Debt-to-income ratio — lenders want to see this below 36%.

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Loan term — shorter terms mean higher payments but lower total interest.

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Collateral — secured loans always have lower rates than unsecured.

How Interest Rate Affects a $25,000 Loan (5-year term)

Rate Monthly Payment Total Interest Total Cost
5%$471.78$3,306.80$28,306.80
8%$506.91$5,414.60$30,414.60
10%$531.18$6,870.80$31,870.80
15%$594.94$10,696.40$35,696.40
20%$662.35$14,741.00$39,741.00
25%$733.54$19,012.40$44,012.40
Modern minimalist office with floor to ceiling windows overlooking city

Know your numbers before you sign.

Understanding the full cost of a loan — including total interest — is the most important step before borrowing. A $25,000 loan at 20% APR costs nearly $40,000 over 5 years. Our calculator shows you the full picture before you commit.

Knowledge Base

Frequently Asked Questions.

Everything you need to know about calculating loan payments, understanding interest rates and making smart borrowing decisions.

Monthly payments are calculated using the standard amortization formula: M = P × [r(1+r)^n] / [(1+r)^n - 1], where P is the principal, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments. This ensures each payment covers both the interest due that month and a portion of the principal.

The interest rate is the base cost of borrowing expressed as a percentage. APR (Annual Percentage Rate) includes the interest rate plus all lender fees — origination fees, closing costs, etc. APR gives you the true annual cost of the loan. Always compare APR, not just interest rates, when shopping for loans.

Shorter terms mean higher monthly payments but significantly less total interest paid. Longer terms lower your monthly payment but you pay much more in interest over time. For example, a $25,000 loan at 9% over 3 years costs $3,606 in interest. The same loan over 7 years costs $8,488. Choose the shortest term your budget can comfortably handle.

Generally: 720+ (excellent) gets the best rates around 6–9% for personal loans. 680–719 (good) gets rates around 10–14%. 620–679 (fair) gets rates around 15–20%. Below 620 may face rates above 20% or loan denial. Improving your credit score before applying can save thousands in interest over the life of a loan.

Yes — paying extra toward your principal each month reduces both the balance and the total interest. However, check for prepayment penalties first. Some lenders charge a fee if you pay off a loan early (typically 1–3% of remaining balance or 2 months' interest). Federal student loans have no prepayment penalties.

Debt-to-income (DTI) ratio is your total monthly debt payments divided by your gross monthly income. Lenders use this to assess your ability to repay. Most lenders prefer a DTI below 36%, with no more than 28% going toward housing. To calculate: add up all monthly debt payments, divide by monthly gross income, multiply by 100.