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Mortgage and Car Loan Calculator Pro icon

Mortgage and Car Loan Calculator Pro

Professional Updated 2026.08.30

Paste the following prompt into your AI chat to install this skill:

Install @user_70c2f807/loan-calculator-pro according to https://skillhub.cn/install/skillhub.md.

About this skill

Problem This Solves

Loan payments are not only about the monthly amount. They also require comparing total interest, early repayment pressure, and whether prepayment saves enough to justify it. loan-calculator-pro frames this as a pure calculation task: given the principal, term, annual interest rate, and repayment method, it returns the monthly payment, total interest, and total repayment amount. This helps non-specialists understand the difference between equal-installment and equal-principal schedules.

How It Works

The skill first confirms the core parameters:

  • Loan amount, usually in ten thousand units
  • Loan term, commonly 20/25/30 years for mortgages and 1-5 years for car loans
  • Annual interest rate, with reference ranges only when needed
  • Repayment method, supporting equal installment, equal principal, or a comparison

It then calculates the monthly payment, total repayment, and total interest using the selected method. If prepayment is requested, it estimates the interest saved. The output emphasizes numeric differences and adds caveats, such as rate adjustments tied to LPR and bank-specific approval terms.

Boundaries

It is suitable for pre-decision cost estimates, not for loan applications, live rate advice, credit assessment, approval, or investment guidance. It does not connect to bank systems, store loan data, or access credit reports. For second-home loans, combined loans, or income-affordability checks, specific rates, amounts, or income figures are required.

Use Cases

  • Before buying a home, compare 20-year and 30-year mortgage monthly payments and total interest under equal-installment and equal-principal schedules.
  • When buying a car, calculate the monthly loan payment for a 3-year term at 5% annual rate and check whether it exceeds 40% of income.
  • After three years of loan payments, simulate prepayment to estimate the interest saved by paying off the remaining principal.
  • For combined housing loans, enter housing fund and commercial loan amounts and rates separately, then summarize the total monthly burden.

Best For

  • First-time homebuyers who need to estimate monthly payments and total interest before rate discussions.
  • Car buyers on a budget comparing 3-year versus 5-year loan payment pressure.
  • Existing borrowers evaluating whether prepayment saves enough interest to justify it.
  • Financial planning consultants who need quick repayment figures for client cash-flow checks.