Loans & Debt Calculators Hub

Plan borrowing, compare loan options, and build a realistic payoff strategy with interactive tools for mortgages, auto loans, personal loans, consolidation and more.

Quick Loans & Debt Scenario Planner

Model a simple loan or a debt payoff plan in seconds. Adjust sliders to see how payment, term, and interest rate change your total cost.

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Tip: include all fees you plan to roll into the loan.

Key results

Monthly payment
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Total interest
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Total paid
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Time to payoff

Interest vs. principal

Principal 50% · Interest 50%

Explore loan & debt calculators by goal

How this Loans & Debt planner works

The quick planner above uses the standard amortizing loan formula to estimate monthly payments, total interest, and payoff time. It is similar to what banks and online lenders use when they quote you a payment.

Monthly payment formula (amortizing loan)

For a loan with principal \(P\), monthly interest rate \(r\), and number of payments \(n\):

\[ \text{Payment} = P \times \frac{r(1+r)^n}{(1+r)^n - 1} \]

Where:

  • \(P\) = loan amount or current balance
  • \(r\) = annual percentage rate (APR) ÷ 12
  • \(n\) = term in years × 12

In New loan mode, we solve this formula directly to find your payment, then multiply by \(n\) to get the total paid and subtract the principal to get total interest.

In Debt payoff mode, we reverse the problem: given a balance, APR, and a fixed monthly payment, we iterate month by month until the balance reaches zero. This gives you:

  • Months and years to payoff
  • Total interest paid over the life of the payoff plan
  • A visual breakdown of principal vs. interest

Understanding interest vs. principal

The colored bar in the results shows how much of your total payments go to principal (what you borrowed) versus interest (the cost of borrowing). A longer term or higher rate increases the interest share dramatically.

Use this to compare scenarios:

  • Shorter term → higher payment, much less total interest
  • Lower rate → lower payment and lower total interest
  • Extra payment (in payoff mode) → fewer months and less interest

When to use each type of loan calculator

Different borrowing goals call for different tools. This hub groups calculators so you can quickly find what you need:

  • Everyday loans & payoff – for generic personal loans, installment loans, and seeing how extra payments change your payoff date.
  • Debt consolidation & strategy – to compare consolidation options and choose between snowball (smallest balance first) and avalanche (highest rate first).
  • Mortgages & home loans – for long-term, large balances where taxes, insurance, and PMI matter.
  • Auto, student & specialty loans – for vehicle financing, student loans, and business borrowing.

Limitations & assumptions

  • Calculations assume a fixed interest rate and fixed monthly payments.
  • We ignore late fees, prepayment penalties, and variable-rate adjustments.
  • Real lender offers may include origination fees or other charges that change your effective APR.

This hub is for education and planning only and is not financial advice or a loan offer. Always review the full terms from any lender before you sign.

Next steps

  • Use the planner above to get a rough sense of what you can afford.
  • Drill into a specific calculator (mortgage, auto, personal, consolidation) for more detailed inputs.
  • Experiment with different payoff strategies to reduce interest and become debt‑free faster.

Loans & Debt FAQs

How do I choose the right type of loan?

Start with your goal and time horizon. For a home, look at mortgages and HELOCs. For a car, use an auto loan or lease calculator. For smaller, shorter-term needs, a personal loan or 0% promo credit card might work. Compare APR, total interest, fees, and how stable your income is before committing.

What is a good debt-to-income (DTI) ratio?

Many lenders prefer a total DTI below about 36%. Some mortgage programs allow up to 43–50%, but the lower your DTI, the more flexibility and safety you have. Use our Debt-to-Income Ratio calculator to see where you stand and how new loans would affect your DTI.

Is debt consolidation always a good idea?

Consolidation can help if it lowers your interest rate, simplifies payments, or shortens your payoff time. It can hurt if it extends your term so much that you pay more interest overall, or if fees are high. Always compare total cost and payoff date using our consolidation and payoff calculators before you decide.

How can I pay off debt faster without breaking my budget?

Even small extra payments make a big difference over time. Try rounding up your payment, applying windfalls (tax refunds, bonuses), and using the snowball or avalanche method. Our Debt Snowball and Debt Avalanche calculators show exactly how many months and how much interest you can save.