Mr Calcu | Plan smarter with instant, clear mortgage estimates tailored to your home loan goals.

Quickly estimate your mortgage payments and visualize your amortization schedule. Empower your home buying decisions and plan your budget with confidence.

Easily calculate mortgage payments and schedules.

Mortgage Calculator Guidelines

Let’s get your numbers working for you!

  • Enter your loan amount, interest rate, and loan term accurately.
  • For ARMs, define the initial rate, adjustment frequency, and cap details.
  • To simulate early payoff, add extra monthly payments.
  • All currency is assumed in USD.
  • Advanced options let you set payment frequency and interest-only periods.

Mortgage Calculator Description

Mortgage Calculation Fundamentals

A mortgage represents a long-term financial commitment. This advanced tool applies standard mortgage formulas to help you estimate monthly payments and analyze amortization schedules with precision.

Monthly Payment Formula

M = P × (r(1 + r)^n) / ((1 + r)^n - 1)

Where:

  • M = Monthly payment
  • P = Loan principal
  • r = Monthly interest rate (annual ÷ 12)
  • n = Total number of monthly payments (years × 12)

Features Included

  • Support for fixed-rate and adjustable-rate mortgages (ARMs)
  • Full amortization tables
  • Interest-only and early repayment options
  • Biweekly payment modeling
  • Edge-case scenarios like 0% interest or balloon payments

Real-World Case Studies

Case Study 1: Fixed-Rate Loan

Sarah borrows $300,000 at 3.75% fixed for 15 years. Her monthly payment is calculated using the formula above. Over the loan term, she pays $81,475 in interest.

Case Study 2: Adjustable-Rate Mortgage

James selects a 5/1 ARM: 2.5% fixed for 5 years, then adjusts annually with a 2% cap per year and 6% lifetime cap. The calculator simulates rate adjustments and new payments across the loan term.

Edge Case Handling

  • 0% Interest: Payment = principal ÷ number of months
  • Negative Amortization: Payments lower than interest cause balance growth
  • Balloon Loans: Model a large final payment manually
  • Biweekly Payments: 26 half-payments/year = 13 full payments
  • ARM Caps: Account for periodic and lifetime rate increase limits

Learn more about these topics on Wikipedia.

Start calculating now to take control of your home loan and make confident, informed financial decisions.

Example Calculation

Example Amortization Breakdown

MonthPaymentPrincipalInterestBalance
1$955.00$300.00$655.00$199,700.00
2$955.00$302.00$653.00$199,398.00
360$955.00$952.00$3.00$0.00

Loan Summary

Loan DetailsValue
Principal$200,000
Interest Rate4%
Loan Term30 Years
Monthly Payment$955.00
Total Interest Paid$143,739.01
Total Payment$343,739.01

Edge Case Example Rows

TypePaymentPrincipalInterestBalance
0% Interest$555.56$555.56$0.00$199,444.44
Biweekly (first)$477.50$295.00$182.50$199,705.00
Balloon Final$30,000.00$30,000.00$0.00$0.00
Neg. Amortization$400.00$0.00$650.00$200,250.00

Frequently Asked Questions

It computes your monthly payment by applying the standard mortgage formula using your principal, interest rate, and loan term.

Yes, it supports both fixed and adjustable rate calculations, including caps and index-based adjustments.

Absolutely, the schedule breaks down each payment into principal and interest components for comprehensive insights.

The entire monthly payment goes toward principal. The monthly payment is simply the principal divided by the total number of payments.

Negative amortization occurs when your monthly payment is less than the interest due, causing the balance to increase over time.

Yes, enter a large lump-sum as a final payment in custom schedule mode. The calculator will adjust remaining balances accordingly.

Biweekly payments result in 26 half-payments per year (13 full payments), reducing interest and shortening loan duration significantly.

Yes, specify the interest-only period duration. The tool will calculate payments with no principal reduction for that duration, followed by amortized repayment.

Principal is the amount you borrow; interest is what the lender charges you to borrow it. Each payment splits between reducing principal and paying interest.

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