Conventional Loan-to-Value Ratio: How It Works

A conventional loan-to-value (LTV) calculator works out the loan amount as a percentage of a home’s value. Enter the loan amount and the property value to see the LTV ratio, a key figure lenders use when assessing a mortgage application.

Formula

LTV ratio = (loan amount ÷ property value) × 100

• Loan amount is the mortgage amount being measured, in dollars.
• Property value is the value used for the calculation, in dollars. For a purchase, this is generally based on the value accepted for the transaction and underwriting; for a refinance, it is based on the value determined for that loan.
• LTV ratio is the result, expressed as a percentage.
• Equity amount in this calculator is property value minus loan amount, in dollars. It is a simple arithmetic difference and does not account for other liens, selling costs, or changes in value.

The calculator uses the numbers you enter; it does not determine which property value a lender will accept or whether a loan is conventional.

Worked Example

Using the defaults above, the loan amount is $320,000 and the property value is $400,000.

1. Divide the loan amount by the property value: $320,000 ÷ $400,000 = 0.8.
2. Convert the decimal to a percentage: 0.8 × 100 = 80.00% LTV.
3. Calculate the simple equity amount: $400,000 − $320,000 = $80,000.

Assumptions

• The entered loan amount and property value use the same currency and cover the same property and transaction.
• This is a one-time ratio calculation, not an amortization schedule. It assumes no change in the loan balance or property value.
• It does not include fees, taxes, insurance, mortgage insurance, escrow, other liens, or lender adjustments to the value.
• The displayed results are rounded to two decimal places for the percentage and to cents for the dollar amount.

What a Conventional Loan LTV Means

A conventional mortgage is a home loan that is not insured or guaranteed through a government-backed mortgage program. “Conventional” describes the broad loan category; LTV describes how large the loan is relative to the property value. The ratio is not an interest rate, a monthly payment, or a direct measure of a borrower’s overall financial position.

For example, an 80% LTV means the loan equals four-fifths of the value entered. It does not mean the borrower has paid exactly 20% of the home’s original price in cash: the property value may have changed, the loan may include a different amount, and other debts secured by the property may exist. The calculator’s equity output is only the difference between its two inputs.

How LTV Is Used

Lenders consider LTV as one part of mortgage underwriting. A higher ratio means the loan is larger relative to the property value, while a lower ratio means more value is not financed by that loan. Lenders may consider LTV alongside factors such as income, debts, credit history, loan purpose, and property details. The applicable criteria depend on the lender and the specific loan; this arithmetic tool cannot predict approval or quote loan terms.

The property value used matters. On a purchase, a lender may use a value supported by its appraisal and transaction review rather than simply accepting an estimate entered by the buyer. In a refinance, the relevant value is established for that application. If a lender’s accepted value differs from the number in the calculator, the resulting LTV will differ too.

Purchase, Refinance, and Combined LTV

For a purchase, a basic LTV calculation compares the mortgage amount with the property value used for the transaction. A down payment can reduce the amount borrowed, but the amount of cash paid and the calculated LTV are not always interchangeable: transaction costs and other financing can affect the cash required without changing the basic formula.

For a refinance, the new loan amount is compared with the property value established for that loan. If there are other loans or liens secured by the property, a lender may also consider a combined loan-to-value ratio (CLTV), which includes relevant additional balances. This page calculates only the single-loan LTV. To estimate a simple CLTV, add the relevant secured loan balances and divide that total by the property value, but confirm which balances the lender includes.

Common Misunderstandings and Calculation Limits

• Confusing LTV with down payment percentage: they may complement each other in a simple purchase example, but LTV is calculated from the loan and property value, not from cash paid alone.
• Using inconsistent values: the loan amount and property value must refer to the same transaction and be expressed in the same currency.
• Treating equity as guaranteed cash: the calculator subtracts one number from another; it does not account for liens, sale expenses, or whether equity can be accessed.
• Assuming a threshold guarantees a particular outcome: LTV can affect underwriting or loan conditions, but it does not by itself establish approval, mortgage insurance requirements, fees, or pricing.

The ratio can exceed 100% if the loan amount entered is greater than the property value. That result is mathematically valid, but whether a lender permits a particular transaction is outside this calculator’s scope. Use figures supplied or confirmed for the specific loan rather than treating a rough online home-value estimate as a lender’s valuation.

Frequently Asked Questions

What is a conventional loan-to-value ratio?
It is the mortgage amount divided by the property value used for the loan, multiplied by 100. It expresses the loan as a percentage of that value.

How do I calculate LTV on a conventional mortgage?
Divide the loan amount by the property value and multiply by 100. For example, a $240,000 loan against a $300,000 value gives an 80% LTV.

Is 80% LTV the same as a 20% down payment?
Not necessarily. In a simple purchase with no other financing and matching price and value, the figures can correspond. But LTV uses the loan and property value, while the down payment is cash contributed; costs, other financing, and valuation differences can make them diverge.

Does a lower LTV guarantee mortgage approval?
No. LTV is one factor among several, and this calculator cannot assess a lender’s underwriting or approval decision.

What is the difference between LTV and CLTV?
LTV compares one loan with the property value. CLTV also considers specified additional loans or liens secured by the property, using the lender’s applicable calculation.

This result is an estimate; the lender’s disclosure gives the exact figures.

Related

• Line Balance Diagram: Meaning and How It Works
• Line Balance Efficiency: Formula and Calculator
• Line Balance Art? Meaning, Methods, and Examples

in loan | Loan amount | $ | 320000 | 1 | 100000000
in value | Property value | $ | 400000 | 1 | 1000000000
out ltv | Loan-to-value ratio | % | loan / value * 100 | 2
out equity | Equity amount | $ | value - loan | 2