About LoanPay Logic

LoanPay Logic is a small independent site built around one simple idea: the numbers that shape big financial decisions should be easy to understand. We make free calculators for mortgages, retirement planning, Amazon FBA fees, shipping and volumetric weight, and a range of everyday conversions. Every tool is designed to give you a clear answer fast, without forcing you through a sign-up form or a maze of ads.

What we do

Our tools start with the decisions people actually face. How much will a monthly mortgage payment be at a given rate and term? How far is my FIRE number with the savings I have today? What will Amazon actually take out of a product sale? Is it cheaper to rent or buy? Behind each calculator we keep the math transparent: you can see the inputs, the assumptions, and the result, and you can change any number to explore the trade-offs yourself.

How the calculators work

Every calculator on LoanPay Logic runs entirely in your browser. When you type in a loan amount, a shipping weight, or a savings goal, the page does the arithmetic locally on your device. Nothing you enter is uploaded to our servers, stored in a database, or shared with anyone. This keeps the tools fast, private, and free to run. You can read more about exactly what we do and do not collect on our Privacy Policy.

Why the site exists

Many calculators online are buried inside lead-generation funnels. They ask for your email before they show a result, or they exist mainly to hand your details to a lender. We think a calculator should just calculate. LoanPay Logic keeps tools open and free, and we write the guidance next to each one ourselves so the examples and limitations are stated plainly rather than hidden in fine print.

Editorial approach

We review and update page content, calculator guidance, and the overall experience on an ongoing basis. The formulas we use follow widely accepted industry standards, and where rates or assumptions can change, we say so next to the tool. Our results are estimates for planning and comparison, not quotes, offers, or advice. See our Disclaimer for the full picture, and our Terms of Use for the rules of the road.

Who writes and reviews our content

Mortgage guides are written by Sarah Mitchell, Senior Mortgage Content Writer — eight years covering U.S. home loans, amortization, and closing costs — and independently reviewed by James Carter, CPA and financial reviewer, who checks loan math, terminology, and regulatory references. Published June 15, 2024; last reviewed September 28, 2026. Corrections go through the same review loop before they are republished.

Talk to us

We read every message. If a calculator looks wrong, an explanation is confusing, or you want a tool we do not have yet, tell us. The fastest way is WhatsApp, and we also welcome feedback through our contact page. Real corrections from real users are how this site gets better.