Loan Calculator

Estimate payments for amortized loans, deferred-payment loans, and simple bond scenarios with clear cost breakdowns and repayment schedules.

Main Features

Amortized Loan (Equal Principal & Interest)

The most common loan type with fixed monthly payments including principal and interest. Suitable for:

• Mortgage loans
• Auto loans
• Student loans
• Personal loans

Results: Monthly Payment, Total Payments, Total Interest
Cash Flow Schedule: Principal, Interest, Balance per period

Deferred Payment Loan

Supports two payment methods:

Interest-Only Mode: Pay interest periodically (e.g., monthly), principal repaid at maturity. Suitable for:

• Commercial bridge loans
• Personal balloon loans
• Investment loans

Balloon Payment Mode: Full principal and interest paid at maturity. Suitable for:

• Short-term financing
• Bridge loans

Results: Monthly Interest, Principal, Amount at Maturity, Total Interest
Cash Flow Schedule: Interest payment, Principal repayment, Balance per period

Bond Calculation

Supports complete pricing analysis for coupon bonds:

Parameters: Face Value, Coupon Rate, Payment Frequency (Annual/Semi-Annual/Quarterly/Monthly), Bond Price, Market Yield

Results: Bond Price, Coupon Payment, Total Coupons, Current Yield, Yield to Maturity (YTM)
Cash Flow Schedule: Coupon per period, Principal at maturity, Cash flow明细

Technical Description

Amortized Loan Formula:
Monthly Payment = P × [r × (1+r)^n] / [(1+r)^n - 1]

Deferred Loan - Interest Only:
Monthly Interest = P × Monthly Rate

Bond Pricing:
Bond Price = Σ(Coupon / (1 + Market Rate/Frequency)^Period) + Face Value / (1 + Market Rate/Frequency)^Total Periods

Yield to Maturity (YTM): Calculated using binary search numerical method

Last verified: 2026-04-06