Bridge Loan Calculator
Calculate the cost of a bridge loan for buying a new home before selling your current one. Compare bridge loan vs HELOC vs 401(k) loan, see month-by-month carrying costs, and find the cheapest way to bridge the gap.
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How to Use This Calculator
Bridge Loan Cost tab
The default tab. Enter your current home value, mortgage balance, new home purchase price, and bridge loan amount. The calculator computes monthly interest-only payments, total interest cost, origination fee, combined monthly payment burden, and available equity. Expand "More options" to adjust interest rate (default 9.5%), loan term (6-36 months), origination fee, closing costs, and your existing mortgage payment.
Alternatives tab
Compare five financing options side by side: bridge loan, HELOC, home sale contingency, 401(k) loan, and piggyback loan (80/10/10). See total cost, monthly payment, speed, and pros/cons for each option. The calculator recommends the best option based on your timeline urgency and shows the lowest-cost alternative.
Timeline tab
See month-by-month carrying costs with a bridge loan, including cumulative cost at each month. Set your expected months to sell, listing price, and market conditions (hot/normal/cold). The calculator shows break-even analysis vs a HELOC, risk scenarios (what if sale takes 3/6/9/12 months), and net proceeds from your home sale after repaying the bridge loan.
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The Formula
Bridge loans are interest-only, meaning you pay only the interest each month with the full principal due when your current home sells:
Total Interest = Monthly Payment × Term (months)
Origination Fee = Bridge Amount × Origination %
Total Bridge Cost = Total Interest + Origination Fee + Closing Costs
Available Equity = Current Home Value × 80% − Mortgage Balance
Combined LTV = (Mortgage + Bridge Amount) / (Current + New Home Value) × 100
Combined Monthly Burden = Existing Mortgage Payment + Bridge Interest Payment
Unlike a traditional mortgage, bridge loans are interest-only with a balloon payment. You don’t pay down principal during the loan term — the entire balance is due when your old home sells. This keeps monthly costs lower but means the total owed does not decrease.
The typical total cost of a bridge loan is 3-6% of the loan amount for a 6-month term, including interest and fees. On a $150,000 bridge loan at 9.5% for 12 months, expect roughly $14,250 in interest plus $3,000–5,000 in origination and closing costs.
Example
Sarah and David — upsizing in Austin, TX with a bridge loan
Sarah and David own a home worth $450,000 with $280,000 remaining on their mortgage. They found a new home for $525,000 and need a $150,000 bridge loan for the down payment. Their current mortgage payment is $1,800/month. Bridge loan rate: 9.5%, 12-month term, 2% origination fee, $5,000 closing costs.
Bridge Loan Cost tab
Sarah and David pay $2,988/month combined (existing mortgage + bridge interest) during the bridge period. The total cost of bridging is about $22,250.
Alternatives tab
If they had planned 6 weeks ahead, a HELOC would have saved $9,000 vs the bridge loan. But their timeline was urgent — they needed funds in 10 days to secure the new home.