Mortgage Rate Comparison Calculator

Mortgage Rate Comparison Calculator helps estimate Korea-related mortgage, jeonse loan, policy loan, or reverse-mortgage assumptions in English.

Mortgage rate comparison calculator

Uses the Korean mortgage-rate library for scenario comparison, fixed-vs-variable analysis, rate shock impact, and refinancing economics.

Korean source inputs

Cheapest scenario

Didimdol policy loan

Total interest ₩123,928,308.

First monthly payment

₩1,177,579

Effective rate 1.4%.

Fixed interest

₩203,233,939

Monthly ₩1,397,872.

Variable difference

₩6,559,255

Variable total interest minus fixed total interest.

DSR affordability limit

7%

Maximum rate under the 40 percent DSR assumption.

Refinancing benefit

₩38,906,681

19 month break-even.

This English calculator calls the same pure Korean calculation function used by the Korean page. Inputs and labels are translated; the formula is not replaced by a generic stub.

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Mortgage rate comparison calculator

This guide follows the Korean mortgage-rate comparison model for fixed-rate, variable-rate, mixed-rate, refinancing, DSR pressure, rate-shock scenarios, and bank-type comparison.

Rate environment and product bands

The Bank of Korea base rate was 2.75 percent in April 2026, while many Korean mortgage offers were in the 3 to 5 percent range. The calculator therefore starts from realistic product bands instead of a generic loan formula.

Market banks are represented around 3.2 to 3.5 percent, internet banks around 3.5 to 4.5 percent, and policy loans around 3.0 to 4.0 percent. DSR 40 percent remains a central screening rule for ordinary bank debt capacity.

Fixed, variable, and refinancing

A 0.5 percentage point rate gap can move 30-year interest by tens of millions of won on a large mortgage. That is why the Korean source compares monthly payment, total interest, rate-shock effect, and fixed-versus-variable breakeven rather than showing only the first-month payment.

Early repayment fees are also preserved: ordinary banks often use about 1.0 to 1.5 percent within 3 years, internet banks about 0.5 to 1.0 percent, and Bogeumjari-style policy loans can use 1.2 percent within 5 years with a 20 percent annual step-down.

Reading the output

The English calculator calls compareScenarios, analyzeFixedVsVariable, analyzeRateImpact, and analyzeRefinancing from the Korean feature library. It keeps loan amount, term, grace period, repayment type, fixed period, and refinancing cost as explicit inputs.

Use the result to compare the all-in cost of rate choice. A lower headline rate can be worse after fee, remaining term, DSR headroom, and future rate shock are included.