How to Calculate a Bridge Loan in California: Amount, Payment & Cost

The Three Numbers You Need

Before you apply for a California bridge loan, you should be able to calculate three figures on your own: how much you can borrow, what your monthly payment will be, and what the loan will cost you in total. None of these calculations requires a finance degree. They require three inputs: your property value, your existing mortgage balance, and an estimate of how long you will hold the loan.

Calculation 1: Maximum Loan Amount

The bridge loan amount is determined by the available equity in your departing property, subject to the lender's loan-to-value (LTV) cap. North Coast Financial lends up to 65 to 70% of the current market value of your departing property. Your existing mortgage balance is subtracted from the gross maximum to arrive at your net available loan amount.

Formula: Maximum Bridge Loan Amount

Max Loan = (Property Value × LTV%) − Existing Mortgage Balance

Loan Amount Example: Marin County Home

Current property value$1,400,000

LTV at 65%$910,000 gross max

Existing mortgage balance$380,000

Maximum Bridge Loan Amount$530,000

The actual amount you borrow may be less than the maximum. If you only need $300,000 to complete your new home purchase, you would borrow $300,000 rather than the full $530,000. Borrowing less means smaller monthly payments and lower total cost.

Calculation 2: Monthly Payment

Bridge loan monthly payments are calculated on simple interest: the loan balance multiplied by the annual rate, divided by 12 months. This is straightforward to calculate and does not change month to month as long as the balance stays the same.

Formula: Monthly Payment

Monthly Payment = Loan Amount × (Annual Rate ÷ 12)

Monthly Payment Example: $530,000 at 10.50%

Loan amount$530,000

Annual rate10.50%

Monthly rate (10.50% / 12)0.875%

Monthly Payment~$4,638

At the current rate range of 9.95% to 10.95% (APR 11.40% to 13.22%), the monthly cost per $100,000 borrowed falls between roughly $829 and $913. You can multiply this by the number of hundreds of thousands you borrow to quickly estimate your payment.

Calculation 3: Total Carry Cost

The total cost of the bridge loan is the sum of three components: upfront points paid at closing, monthly payments for the hold period, and standard closing costs.

Formula: Total Carry Cost

Total Cost = Points + (Monthly Payment × Months Held) + Closing Costs

Total Cost Example: $530,000 Loan, 90-Day Hold

Points (1.50 on $530,000)$7,950

Monthly payment ($4,638 x 3 months)$13,913

Estimated closing costs (title, escrow, etc.)~$3,200

Estimated Total at 90 Days~$25,063

Run Your Own Scenarios

The value of doing these calculations yourself before calling a lender is that you go into the conversation knowing your numbers. Here is a simple way to stress-test your situation:

Best case: Run the calculation assuming a 60-day sale. What is your total cost?
Base case: Run it assuming a 90 to 120-day sale. Is the number still comfortable?
Stress test: Run it at 180 days. Is this still within your financial range? If this scenario causes serious problems, plan to price your home aggressively from day one.

Important Note

These calculations give you a working estimate, not a locked rate or guaranteed loan amount. Your actual loan amount, rate, and points will be confirmed by the lender after reviewing your specific property and situation. Call North Coast Financial for an exact quote based on your real numbers.

Frequently Asked Questions

How do you calculate a bridge loan amount in California?

The maximum bridge loan amount is calculated as (Current Home Value x LTV) minus Existing Mortgage Balance. For example, if your home is worth $1,000,000 and you owe $300,000, the calculation at 65% LTV would be ($1,000,000 x 0.65) minus $300,000, which equals $350,000. The LTV cap is typically 65 to 70%.

How do you calculate the monthly payment on a bridge loan?

The monthly payment on a bridge loan is calculated as Loan Amount x (Annual Rate / 12). At a 10% annual rate on a $400,000 bridge loan, the monthly payment would be $400,000 x (0.10 / 12), which equals approximately $3,333 per month. Bridge loans require full monthly payments throughout the loan term.

What is the total cost of a California bridge loan?

The total cost is: Points paid at closing + (Monthly Payment x Months Held) + Closing Costs (title, escrow, recording, etc.). For a $400,000 loan at 10% with 1.5 points and a 90-day hold, you would pay $6,000 in points, $10,000 in interest, and roughly $3,500 in closing costs, for a total of approximately $19,500.

What LTV is used to calculate a California bridge loan?

North Coast Financial bridge loans are available up to 65 to 70% of the departing property's current market value. The specific LTV depends on the loan amount, property type, and overall deal profile. The existing mortgage balance is subtracted from the maximum gross loan amount to determine how much you can borrow.