By Meraj Uddin Provat · Last reviewed May 23, 2026 · Editorial Standards
Simple calculators for big money decisions
Find the calculator. Change the numbers. Understand the decision.
CalcCottage keeps home-buying, mortgage, energy, and EV math readable on a phone. No account, no spreadsheet, no guessing what a result means.
Start here
Choose by decision, not by jargon.
Cards are grouped around what people actually ask before buying, borrowing, upgrading, or moving.
Local defaults
State pages should feel useful, not duplicated.
Use state and county pages for different transfer taxes, property-tax habits, utility prices, and incentive assumptions.
Fast first result
Default numbers let visitors understand the calculator before editing every field.
Plain assumptions
Each calculator explains what is included, what is excluded, and what can change locally.
Mobile friendly
Large targets, one-column forms, readable labels, and no hidden interactions.
New guide
First-Time Home Buyer Guide — The Honest Step-by-Step
Seven steps in the order they actually matter, each with the calculator that gives you a real answer.