Mortgage Refinance Calculator: Estimate Your New Loan and Costs
Model a refinance and see its real impact on your budget and total borrowing cost.
Refinance simulation
Adjust your inputs to estimate your new payment and visualize amortization.
I want to
Your mortgage details
Refinance results
Review your payment, amortization path, and overall refinance impact.
Refinancing, Explained Simply
Refinancing means replacing your current mortgage with a new one. Unlike renewal (where you mainly change term and rate), refinancing is often used to:
- increase borrowed amount (for a project, for example) - change amortization (longer to lower payment, or to reorganize budget) - use part of your home equity - sometimes adjust administrative aspects (e.g., title changes, depending on legal process)
Best reflex: before moving forward, run a simulation and a mini cost-benefit analysis.
Important note: this is general information. A refinance affects your budget, costs, and contract terms. Validate with a professional before signing.
How the Refinance Calculator Works
The calculator answers three questions:
- What would my new payment be?
- How much money am I pulling out (or not) from the refinance?
- What changes in total cost (interest + potential fees)?
What You Can Change (Amount, Amortization, Rate)
You mainly adjust:
- New mortgage amount (current balance + additional amount, if applicable)
- New rate (based on your offer and market context)
- New amortization (often adjusted to keep payment manageable)
- Payment frequency
Data to Prepare Before Simulating
For a useful simulation, prepare:
- current balance
- current rate and term-end date
- remaining amortization
- approximate property value (conservative estimate)
- estimate of break penalty and fees (ask your lender)
Costs to Consider Before Saying "Yes"
A refinance can be powerful... but it is rarely free.
Breaking the Current Term: Possible Penalty
If you are still in the middle of your term, your lender may charge an indemnity to end the contract early. This is often the largest cost.
Good to know: if you are close to maturity, break cost can be lower - but it depends on contract details.
File Fees, Appraisal, Notary/Legal: Budget Envelope to Plan
Depending on your file, there may be:
- property appraisal
- legal/notary fees
- administrative transfer/registration fees
- other setup costs linked to the new loan
The calculator can include a fee-envelope hypothesis, but the best practice is to gather real costs before deciding.
When Refinancing Can Make Sense (and When It May Not)
When Refinancing Can Be Relevant
Refinancing can make sense if:
- you consolidate higher-rate debts (while keeping a clear repayment strategy)
- you finance renovations that improve comfort or value (with prudent limits)
- you want to stabilize budget by reorganizing amortization
- you have a clear, quantified objective and realistic repayment plan
When It Can Be Risky
On the other hand, it can be risky if:
- you refinance by reflex without a plan
- fees + penalty erase expected benefits
- longer amortization materially raises total cost and you have no strategy to manage it
How to Read Results: Available Amount, Payment, Total Cost
When the calculator gives you an output, read it in this order:
- Available amount: how much cash you actually pull after paying off current balance and fees (if included).
- New payment: is it sustainable with a safety margin?
- Estimated interest: especially over term, and a view of longer-horizon cost.
A "winning" refinance is not the one that gives the most cash. It is the one that reaches your objective at an acceptable cost.
Fictional Example: Pull Equity Without Blowing Up Monthly Payment
(Simplified fictional example.)
Starting Situation
- Estimated property value: $650,000
- Current mortgage balance: $360,000
- Remaining amortization: 18 years
- Current rate (assumption): 5.05%
- Estimated current payment: about $2,541/month
Project
You want $65,000 to consolidate debts and create a small cash cushion.
Fee assumption (notary/appraisal/etc.): $5,000.
Refinance Simulation
- New amount: $430,000 ($360,000 + $70,000)
- Estimated net cash: $70,000 - $5,000 = $65,000
- New amortization: 25 years
- New rate (assumption): 5.10%
- Estimated new payment: about $2,539/month (roughly similar)
Trade-off to Watch
Even if payment stays close to the same level, total cost can increase because:
- you are borrowing more
- you are stretching amortization
In this fictional simulation, estimated 5-year interest is higher than before. Refinance can still make sense if the cash-out replaces much more expensive debt - provided you have a clear repayment plan.
Practical Tips + Questions to Ask
Before signing, ask these simple but powerful questions:
- "What is the exact break penalty amount today?"
- "Which fees apply, and which can be covered or reimbursed?"
- "Does my mortgage insurance or any key condition change?"
- "What would payment look like with shorter/longer amortization?"
- "Can I make easy prepayments if I want to repay faster?"
Soft CTA: Compare Your Options / Talk to an Expert
Run one simulation with (1) your project, (2) a prudent fee assumption, and (3) two different amortizations. Then discuss with an advisor to validate real costs, qualification, and the healthiest structure.