Mortgage Comparison Calculator
Put two loan offers on the same page — amount, rate, and term for A and B — then see payment and lifetime interest deltas. Click any i for detail.
Scenario A vs B
A loan amount ($)
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Scenario A amount
Principal for offer A. |
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|---|---|
A rate (%)
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Scenario A rate
Note rate for offer A. |
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A term (years)
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Scenario A term
Amortization years for offer A. |
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B loan amount ($)
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Scenario B amount
Principal for offer B. |
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B rate (%)
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Scenario B rate
Note rate for offer B. |
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B term (years)
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Scenario B term
Amortization years for offer B. |
How to use this calculator
- Fill scenario A amount, rate, and term.
- Fill scenario B the same way.
- Read payment and interest deltas.
Results explained
Headline is the absolute interest difference over each loan’s full term. Range text says which side costs more interest.
Quick reference: comparison
Useful for lender shopping.
| Item | Detail |
|---|---|
| Payment delta | PMT_A − PMT_B |
| Interest delta | Interest_A − Interest_B |
| Scope | P&I only |
Closing costs and credits belong in a separate cash-to-close worksheet.
How the estimate is built
Each side uses loan.pmt and totalInterestAmortizing independently.
Example scenario
Same $450k balance: 6.625% vs 6.25% for 30 years — B usually wins on both payment and interest.
FAQ
Can amounts differ?
Yes — useful when one offer finances closing costs.
Different terms?
Supported — remember interest totals are over different horizons.
APR vs rate?
Enter note rates here; use the APR calculator if you only know payment.