Biz Toolkit — ROI, Margin & Tax Calculator

Quick ROI, profit margin, break-even, and sales tax calculators for small business owners — right from your browser toolbar.

Biz Toolkit gives small business owners, freelancers, and entrepreneurs four essential financial calculators in one simple browser popup — no spreadsheets, no sign-up, no data collection. FEATURES 📊 ROI Calculator Enter your investment cost and return to instantly see your net profit and return on investment percentage. 💰 Profit Margin Calculator Enter revenue and cost of goods sold to get your gross profit, margin percentage, and markup percentage in one click. ⚖️ Break-even Calculator Enter fixed costs, price per unit, and variable cost per unit to find exactly how many units you need to sell to break even. 🧾 Sales Tax Calculator Enter a price and tax rate to quickly calculate tax owed and total price — handy for quotes, invoices, and quick checks. WHY BIZ TOOLKIT - Fast — get answers in seconds without opening a spreadsheet - Private — all calculations run locally in your browser; nothing is collected, tracked, or sent anywhere - Simple — clean tabbed interface, no clutter - Free — no account, no subscription, no ads Built by the team at BusinessKiwi.com, a resource for small business owners covering finance, growth, and operations. Have feedback or a feature request? Visit businesskiwi.com to get in touch.