Japan Mortgage Calculator

Home loan & prepayment sim

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

A clear, easy-to-read simulator for Japanese home loans (住宅ローン). Enter the loan amount, interest rate and term to see your monthly payment instantly. Main features - Real-time monthly payment (no calculate button) - Equal-payment (annuity) and equal-principal methods - Bonus payments (twice a year) - Rate presets: variable, 10-year fixed, Flat 35 - Prepayment simulation (term-reduction / payment-reduction) - Mortgage tax deduction estimate - Variable-rate rise simulation (5-year / 125% rule) - Refinance comparison with break-even - Borrowing capacity from income, property-price to loan-amount - Repayment schedule with balance chart, save & compare plans, share as image Free, no ads, no registration, works offline. Dark mode supported. Note: results are estimates. Please confirm the actual repayment amount with your financial institution.

Ratings & Reviews

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Added bank rate comparison — compare monthly payments across major banks.

Version 1.0.3

The developer, KUMU Studio, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • KUMU STUDIYA, OSOO
    Size
    • 2.5 MB
    Category
    • Finance
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 10 more
    • English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 KUMU STUDIYA, OSOO
  • Privacy Policy

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