Loan-to-Value Ratio Formula and Calculator

The loan-to-value (LTV) ratio formula is LTV = loan amount ÷ property value × 100. Enter the loan amount and the property’s value below to calculate the percentage; the result shows how much of the value is represented by the loan.

Formula

LTV (%) = (L ÷ V) × 100

• L is the loan amount, in dollars. Use the amount of the loan being measured, not a monthly payment or the total interest over its life.
• V is the property value, in dollars. For a purchase, this may be the price or a value used by the lender; for a refinance or home-equity loan, a valuation may be used. The relevant value can depend on the lender’s calculation.
• LTV is the loan-to-value ratio, expressed as a percentage.

The calculator also displays value not covered by the loan = V − L as a dollar amount. This is a simple difference, not necessarily the homeowner’s actual equity: other loans secured by the property, transaction costs, or changes in value may affect the broader picture. The calculator assumes the loan amount does not exceed the property value; when it does, the displayed LTV is over 100% and the difference is negative.

Worked Example

Using the calculator’s default values:

1. Loan amount: $200,000.
2. Property value: $250,000.
3. Divide the loan by the value: $200,000 ÷ $250,000 = 0.8.
4. Convert the decimal to a percentage: 0.8 × 100 = 80.00% LTV.
5. Calculate the value not covered by the loan: $250,000 − $200,000 = $50,000.

What the Ratio Measures

LTV compares a loan secured by property with the property’s stated value. It is a snapshot, not a measure of monthly payment, total borrowing cost, or ability to repay. A higher percentage means the loan represents a larger share of the value used in the calculation; a lower percentage means it represents a smaller share.

For example, a $180,000 loan against a property valued at $240,000 gives an LTV of 75%. If the loan stays at $180,000 but the value used becomes $225,000, the ratio is 80%. The arithmetic changes because the denominator changed, even though the loan did not.

In a purchase, a difference between price and loan amount can resemble a down payment, but it is not always identical to cash contributed. The loan amount may include or exclude particular financed items, and the property value used for LTV may not be the purchase price. Check which figures the relevant lender or document uses.

How to Choose the Inputs

• Use the loan being evaluated. For a proposed first mortgage, enter that mortgage amount. If measuring combined borrowing secured by the property, include the other relevant balances only when the stated calculation calls for them.
• Use the matching property value. A sale price, appraisal, or lender valuation may differ. Do not assume they are interchangeable; identify the value specified for the calculation.
• Keep the amounts in the same currency and basis. Both inputs should be dollar amounts for the same property and valuation date. The ratio is unitless, but inconsistent inputs produce a misleading result.
• Use precise figures before rounding. Rounding the loan or value early can shift the final percentage, particularly when the amounts are close together. This calculator displays LTV to two decimal places.

If the loan amount is zero, LTV is 0%. The property value must be greater than zero because division by zero is undefined. A result above 100% is mathematically possible when the loan exceeds the value entered; it should prompt a check of the inputs and the purpose of the calculation, not an assumption that the formula is broken.

Common Uses and Misunderstandings

LTV can be used as one part of comparing property financing scenarios, tracking how a loan balance relates to an estimated value, or understanding a lender’s stated calculation. It does not by itself tell you whether a loan will be approved, what rate or fees apply, or what the required monthly payment will be. Those depend on additional information and lender-specific terms; obtain exact figures from the lender.

A frequent misconception is that LTV is the same as equity. For a basic illustration, property value minus mortgage balance gives a rough amount of value not covered by that mortgage. But actual equity calculations may need to account for other secured debts and the value estimate may be uncertain. The calculator’s second output is only the simple subtraction shown in its formula.

Another common confusion is using the property’s value as the numerator. The loan goes on top; property value goes on the bottom. Reversing them calculates a different number. Also, multiply by 100 to express the quotient as a percentage: 0.8 is the decimal form of 80%, not 0.8%.

Limits of the Calculation

The formula is intentionally simple. It does not estimate an appraisal, predict future property prices, calculate a loan balance after scheduled payments, or include interest, taxes, insurance, fees, or other costs. It also does not determine which debts a lender includes in its own LTV measure. For a second loan or other borrowing secured by the property, ask which balances and valuation the lender uses before comparing your calculation with its figure.

Because property value is an input rather than a forecast, the result can change when a lender or owner uses a different valuation. Treat an estimate based on an assumed value as conditional: the arithmetic may be exact for the numbers entered while the underlying value remains uncertain.

Frequently Asked Questions

How do you calculate loan-to-value ratio?
Divide the loan amount by the property value, then multiply by 100. For a $150,000 loan on a property valued at $200,000, the result is 75%.

What is a good LTV ratio?
There is no universal answer in the formula. Lender requirements and the purpose of the borrowing vary, and this calculator does not assess approval or recommend a loan. Ask the lender how it interprets the ratio for your specific transaction.

Can LTV be over 100%?
Yes. If the loan amount entered is greater than the property value entered, the formula returns a result above 100%. Confirm that both inputs are correct and use the valuation and loan definition relevant to the calculation.

Is LTV the same as a down payment percentage?
No. In a simplified purchase where the entire price is the denominator and the only borrowing is the mortgage, the loan share and the amount not financed add to 100%. Real transactions may use different valuation figures or include other amounts.

Does LTV include a second mortgage?
It depends on the measure being requested. A first-loan LTV uses that loan; a combined measure may include additional loans secured by the property. Check the lender’s definition and enter the corresponding total.

Why does my lender’s LTV differ from this result?
The lender may use a different property valuation, loan balance, or definition of which debts to include. Compare the inputs and calculation basis before concluding there is an arithmetic error.

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

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in loan | Loan amount | $ | 200000 | 1 | 100000000
in value | Property value | $ | 250000 | 1 | 100000000
out ltv | Loan-to-value ratio | % | loan / value * 100 | 2
out equity | Value not covered by loan | $ | value - loan | 2