Five everyday small-business calculators in one HTML file that you open in your web browser. It works with no internet connection: no account, no sign-in, no subscription and no tracking, and it makes no network requests. It only does math on the numbers you type.

What's inside (5 tabs)

• Cash Drawer Close – count bills and coins by denomination (values are editable for your currency), then see expected cash, over / short, and the deposit after keeping tomorrow's float.

• Tip Split – equal, by hours, or by hours × points, with an optional tip-out % taken first. Shares are rounded to the cent and always add up exactly to the pool.

• Price & Margin – price from your cost and a target margin or markup, with an optional sales fee % and fixed fee per sale. Shows profit, margin, markup and break-even price, so you never mix up margin and markup.

• Break-Even – units and sales needed to cover fixed costs, plus an optional profit goal.

• Freelance Hourly Rate – hourly and day rate from your take-home goal, expenses, a set-aside % you choose, weeks off and billable hours.

Also included: formulas shown on every tab, sample numbers on every tab, clear messages for blank, negative or mistyped numbers, print / save as PDF of the open tab, and a 2-page PDF guide with worked examples.

Not included

No saving or history (close the page and your numbers are gone, so print first). No tax or payroll calculations. No live data.

Tested

Chromium and Firefox on Linux at 390 px and 1280 px window widths. Safari, Edge, Windows, macOS and real phones or tablets are not tested. Excel not tested (this is not a spreadsheet).

Files

small-shop-calculator-kit-v1.0.2.zip: small_shop_calculator_kit.html, Guide.pdf (2 pages, US Letter), README.txt, OFL_Lato.txt

Estimates from your inputs only. Not financial, accounting, tax or legal advice. Sample names are fictional. Personal use only – use it for your own household or your own business. Please do not resell or share the file.