About BillMapper

BillMapper makes free planners for the bills that don’t come monthly — and runs every one of them in your browser, so your numbers never leave your device.

Why this exists

People who are careful with a monthly budget can still get knocked sideways when a clump of big irregular bills landed in the same few weeks. Insurance, property tax, registration, the December gift spike: none of them is a secret, but spread across a year and out of sight, they may as well be. We wanted a single tool that pulls them all onto one calendar so the heavy months stop being an ambush.

How we build our planners

• Show the method. Every tool explains exactly what it’s doing — how it spreads a bill across the year, how it finds your worst month, how it works out the long-run contribution, and how it tests the opening balance from a selected start month. No black boxes; you can check it with a calculator.
• Run everything in your browser. The planners are 100% client-side. The incomes, bills and amounts you type are never uploaded, logged or sold. Anything you save lives in your own browser’s storage, and you can clear it in one click.
• Make the output yours. A plan you can’t keep isn’t much use, so our tools export — a printable one-page calendar, a file you can drop into your own phone calendar.
• Stay in our lane. We do cash-flow planning and estimates. We are not financial advisers, and we say so plainly rather than pretending a calculator can replace one.

Who’s behind it

BillMapper is built and maintained by a small independent publisher. The guides use the disclosed editorial pen name Jordan Avery. First-person stories and worked examples are illustrative composites unless a page explicitly documents firsthand verification; they are not testimonials. We don’t sell insurance, loans or financial products, which means we have no reason to nudge you toward anything — the only job of a tool here is to show you your own year clearly. If a planner gives a strange answer or a guide gets something wrong, we want to know: get in touch.

Our method and corrections

We publish browser-based tools with written formulas, assumptions and worked examples. Example prices, work schedules and household budgets are chosen to explain the calculation; they are not market surveys, customer results or verified personal experiences. External rules and product specifications should be checked against the primary sources linked on the relevant page.

A pen name does not imply professional credentials or independent expert review. Calculation checks can find software errors, but they do not certify every statement or make an estimate suitable for every situation.

To report an error, use our contact address and include the page URL, non-sensitive sample inputs, expected result and any supporting source. Substantive content corrections are reflected in the affected page’s update date. A layout change alone does not mean its facts have been reverified.

How we keep it free

Advertising is currently disabled, and affiliate links are not enabled. The publisher currently covers operating costs. Advertising may support the site in future; we will update the disclosure and privacy information when that changes. See our Ad & Affiliate Disclosure.