Ask Mortgage Authority™ Calculators

Browse by category to jump into any calculator.

Explore 40+ mortgage, refinance, APR, rent-vs-buy, retirement, investment, and credit tools. Every calculator is free, fast, and built to help you compare options before you talk to a lender.

Mortgage & Loans

Model monthly payments, APR, amortization, refinance savings, points, PMI, and rent-versus-buy so you can compare scenarios before applying.

Loan Calculator

APR Calculator

Payment Amortization

Early Payoff

Prepayment Savings

Refinance Break-Even

Debt Consolidation

Rent vs Own

Rent vs Buy

Loan Comparison

Loan Refinance

Commercial Loan

Loan Affordability

Loan Tax Saving

Loan Points

Adjustable Rate

Adjustable vs Fixed

Biweekly Payment

Interest Only

Rental Property

Auto Loan

Auto Lease

Investment & Savings

Project compound growth, IRR/NPV, bond yields, tax-equivalent returns, college savings, and target-based savings goals.

TVM Calculator

Currency Converter

Compound Interest

ROI Calculator

IRR / NPV

Bond Calculator

Tax Equivalent Yield

Rule of 72

College Savings

Investment Income

HSA Calculator

Savings Goal

US Treasury Bill

US Inflation

Stock Return

Growth Stock

Non-Growth Stock

CAPM Calculator

Expected Return

Holding Period Return

WACC Calculator

Option Calculator

Effective Rate

Financial Ratios

Business Forecast

Margin & Markup

Retirement

Plan 401k contributions, max strategies, IRA vs Roth decisions, required minimum distributions, Social Security timing, and annuity options.

Retirement Planner

401k Contribution

401k Save the Max

Retirement Savings Analysis

Retirement Income Analysis

Retirement Calculator

Traditional vs Roth IRA

Required Minimum Distribution

Social Security Estimator

Asset Allocation

Annuity Calculator

Credit & Pay

Estimate credit card payoff timelines, minimums, paycheck impacts, salary changes, and net distributions.

Credit Card Payoff

Credit Card Minimum

Paycheck Calculator

Salary Increase

Hourly to Salary

Net Distribution

Tools & Converters

Quick utilities for tips, discounts, percentages, date math, unit conversion, inflation, fuel, margin/markup, and business forecasts.