Engine Tools

About and disclaimer

Engine Tools is a small free-calculator site. It exists so landlords, contractors, and independent contractors can get a straight answer from published formulas, then keep records in a spreadsheet if they want one.

What this site is

The pages are static HTML, CSS, and JavaScript hosted on Cloudflare Pages at a free pages.dev address. Calculations run in your browser. There is no account system, no advertising network, and no analytics or tracking script.

Where a number comes from a tax agency, the page names the source and links to it. The 2026 mileage rates come from the IRS standard mileage rates page, Notice 2026-10, and Announcement 2026-11. Self-employment tax and estimated-tax figures come from the IRS self-employment tax page, Form 1040-ES, Publication 505, Topic No. 560, and Rev. Proc. 2025-32.

What this site is not

These calculators are estimates for education and planning. They are not tax advice, legal advice, investment advice, an appraisal, or a substitute for IRS forms or a qualified professional. We do not prepare or file returns, and we cannot account for every exception that might apply to you, including state and local tax, credits, the qualified business income deduction, or special industry rules.

Tax law and IRS rates change. Mid-year, the IRS revised 2026 mileage rates. Always check the linked IRS pages if you are using a result to plan a payment or a return.

Spreadsheets

Each calculator links to an optional paid workbook sold on Gumroad and Payhip: a rental tracker, a mileage and vehicle log, a contractor job-costing tracker, a 1099 freelancer tracker, and a bundle of all four. The calculators themselves are free and do not require a purchase. We do not post reviews we did not receive, and we do not claim guaranteed savings or investment returns.

Privacy

We do not collect the numbers you type into the calculators. Your browser may still request the page itself from Cloudflare Pages, which is ordinary web hosting. This site does not set marketing cookies or load third-party fonts or trackers.

Contact

Engine Tools is a project of Prairie Field Templates. Product support questions about a spreadsheet you purchased should go through the Gumroad or Payhip order you used.