About Us
Most mortgage calculators give you a number, not the answer to the question you're asking.
MortgageCompareCalculator.com is a free comparison tool that answers the questions that actually matter before you commit to a loan: which option is cheaper over time, how much interest you'll really pay, and what happens if your rate changes.
Why we built this
For a lot of homebuyers, finding a mortgage is the easy part. Knowing whether it's a good deal is harder.
Most online tools give you a single payment estimate, but the real questions go further. Should I take the lower variable rate or lock in fixed? How much does a 15-year term actually save compared to 30 years? What does one extra payment per year do to my total interest? If I go with accelerated bi-weekly payments, when will I actually be mortgage-free?
No calculator we found answered those questions well, so we made one that does. The point is to show homebuyers, homeowners, and refinancers what a mortgage decision actually costs, not what a lender leads with.
Why traditional mortgage calculators fall short
Most mortgage calculators are designed to get you to call a lender, not to help you make a better decision. They show a monthly payment and stop there.
What they leave out:
- How two mortgage offers compare side by side over the full loan term
- The true total interest cost, which often exceeds the original loan amount
- How extra payments change your payoff date and total interest
- What accelerated bi-weekly or weekly payments actually save you
- How an adjustable-rate mortgage behaves once the fixed period ends
- What a rate increase does to a variable-rate mortgage
- The real monthly cost once you add property taxes, insurance, and HOA fees
Those are the gaps this tool is designed to close, not generate leads for lenders.
What makes this tool different
Side-by-side mortgage comparison
Open up to three independent scenarios and compare them at the same time. Each tab is fully isolated: change the rate, term, loan program, or payment strategy in one without affecting the others.
It produces a visual payoff chart, a total cost breakdown, a side-by-side metrics grid, and a plain-language summary that names the better option and shows exactly how much it saves. Whether you're comparing a fixed vs. variable rate mortgage, a 15-year vs. 30-year term, or two competing lender offers, the answer comes out as numbers you can actually use.
Full amortization transparency
Every scenario generates a complete amortization schedule showing every payment broken down by principal, interest, insurance, and extra payments. Expand any year to see the month-by-month detail, or add a one-time lump-sum payment to any row to model a tax refund or bonus applied directly to principal.
On a typical 30-year mortgage, the early years tilt heavily toward interest: a large share of each payment does almost nothing to reduce the balance. Seeing that split directly is often what makes the case for a shorter term or an accelerated payment strategy more convincingly than any general rule of thumb.
Extra payment modeling
Set up monthly, bi-weekly, or annual extra payments and see their exact impact on payoff date and total interest. On a $400,000 mortgage at 5%, an extra $200 a month cuts roughly four years off a 25-year amortization and saves more than $40,000 in total interest. The figures update as you type.
Fixed, variable, and adjustable rate mortgages
The tool models all three mortgage types:
- Fixed-rate mortgages: locked payment for the full amortization period
- Variable-rate mortgages: tied to prime, with a rate sensitivity table showing the payment impact at +1%, +2%, and +3% scenarios
- Adjustable-rate mortgages (ARMs): full cap structure modeling, including the initial fixed period, adjustment frequency, periodic cap, and lifetime cap, so you can see exactly how your rate and payment evolve after the introductory period ends
Canadian mortgage support
Canadian mortgage rules differ from US rules in ways that affect the actual calculation. Fixed-rate mortgages in Canada are legally required to use semi-annual compounding, which produces a different result from the monthly compounding used in the US. The calculator handles that automatically when you select Canada. It also includes:
- CMHC mortgage insurance with correct premium tiers by loan-to-value ratio
- Mortgage term vs. amortization modeling with per-renewal rate scenarios
- GDS and TDS qualification ratios
- Accelerated bi-weekly and accelerated weekly payment frequencies, which are standard in Canadian mortgage products
- Trigger rate warnings for variable-rate mortgages (VRM)
Each tab can be set to US or Canadian independently, so you can compare a Canadian scenario against a US one in the same session.
Save, share, and export
Click Share to send your full scenario to a partner, advisor, or client as a URL. No account needed: the state lives in the link, not on our servers. Anyone who opens it sees your exact inputs and results.
You can also export everything to a formatted Excel file with one click. The workbook includes every open tab with full inputs, key summary figures, and the complete amortization schedule.
Built for privacy
All calculations run entirely in your browser. We never send your mortgage figures, home prices, or any other inputs to our servers.
Shared scenarios compress into the URL itself, never a database. There is no login, no email capture, and no paywall. This matters especially in mortgage tools, where many calculator sites are designed to collect your contact details and pass them to lenders. This one is a decision-support tool, not a lead funnel.
Who uses this tool
First-time buyers use it to understand what they can actually afford before speaking to a lender. For refinancers, the question is usually whether switching mortgages actually saves money once you account for the full loan term, not just the rate difference. Homeowners use it to model accelerated payment strategies and find out exactly how many years they can cut.
It also covers ground most tools ignore: Canadian borrowers who need correct semi-annual compounding, CMHC insurance calculations, mortgage term vs. amortization modeling, and GDS/TDS ratios, not just a US calculator with a different currency symbol. Real estate agents and mortgage brokers use it to walk clients through scenarios in real time and share the results as a link.