Free Business Tools for Founders

These calculators were built for the founders, freelancers and small business owners who read FBScoach. Each one comes with the formula, a worked example and answers to common questions, so you can check the logic instead of trusting a black box.

Six free calculators built for founders, freelancers and small business owners. Every tool runs in your browser, so the numbers you type are never sent to our servers.

Profit Margin & MarkupFind your margin and markup, or work out the price you need to hit a target margin.

Break-even CalculatorSee how many units or how much revenue you need each month to cover costs.

GST CalculatorAdd or remove GST at any rate and see the CGST, SGST or IGST split.

ROI & CAGR CalculatorTurn an investment and its final value into total return and yearly growth.

Startup Runway CalculatorEstimate how many months of cash you have at your current burn rate.

Founder Dilution CalculatorSee how much of the company you keep after a funding round.

How to choose a tool

Start with the profit margin calculator when you are setting a price, move to break-even to check how much you must sell, and use GST to prepare accurate invoices. When you are thinking about investors, the ROI and CAGR, runway and dilution calculators show what an investment returns, how long your cash lasts and what a funding round costs you in ownership.

All tools run in your browser and nothing you type is stored or sent to our servers. They are planning aids, not professional advice. Read our disclaimer and editorial policy to see how we build and maintain them.