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The founder's toolkit · Always free
An idea is a start. Make your next move count.
Run the numbers. Find your starting point. Everything here is free, with no sign-in or credits.
Free startup calculators
All calculatorsEvery number. A clearer decision.
Your inputs. Clear working. Find the costs, margins and milestones behind your next move.
- Break-evenHow many units you have to sell before the business stops losing money.Open calculator
- Startup costWhat it costs to open the doors, and how long your cash lasts after that.Open calculator
- Return on investmentHow long the money you put in takes to come back, and what it returns in a year.Open calculator
- Funding neededHow long your cash lasts, and how much more you need to reach the month you are aiming for.Open calculator
- Customer Acquisition CostHow much you spend to acquire a single paying customer.Open calculator
- Lifetime Value (LTV)A strategic tool to calculate Lifetime Value (LTV) for your business.Open calculator
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- LTV:CAC RatioA strategic tool to calculate LTV:CAC Ratio for your business.Open calculator
- Payback PeriodA strategic tool to calculate Payback Period for your business.Open calculator
- Gross MarginA strategic tool to calculate Gross Margin for your business.Open calculator
- Net MarginA strategic tool to calculate Net Margin for your business.Open calculator
- ARPUA strategic tool to calculate ARPU for your business.Open calculator
- Churn RateA strategic tool to calculate Churn Rate for your business.Open calculator
Startup guides
All guidesOpen a new chapter.
Practical reading for the decisions ahead, with fresh picks from the library each visit.
- User Retention Strategies for SaaS: Keeping Customers ForeverRetention is a product of systemic engagement, not just friendly customer support. To keep customers long-term, your product must…Read the guide
- Product-Market Fit Metrics: How to Measure True PMFProduct-market fit is not a gut feeling; it is a mathematical reality visible in your data. If you scale acquisition before…Read the guide
- TAM, SAM, and SOM Market Sizing: A Practical GuideUnderstanding your market isn't a theoretical exercise; it’s a foundational requirement for any operator building a viable…Read the guide
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- B2B SaaS Churn Reduction: High-Retention StrategiesAcquiring a new customer is five times more expensive than retaining an existing one. High churn will eventually stall your…Read the guide
- Go-to-Market Strategy for B2B StartupsA Go-To-Market strategy is not a marketing plan; it is the operational alignment of pricing, sales, and distribution. In B2B…Read the guide
- Zero-Investment Business Models for Bootstrapped FoundersCapital is an accelerant, not a prerequisite. Bootstrapping forces financial discipline and rapid iteration. By leveraging…Read the guide
Startup glossary
Full glossaryBig ideas. Plain words.
The terms you will meet along the way, explained in plain language.
- CAC Payback PeriodThe number of months it takes for the gross margin generated by a customer to pay back the cost of acquiring…See the definition
- Operating Expenses (Opex)The expenses a business incurs through its normal business operations, excluding COGS.See the definition
- PivotA fundamental shift in a startup's business strategy, product direction, or target market after discovering…See the definition
- Magic NumberA metric measuring sales efficiency. It calculates the revenue generated for every dollar spent on sales and…See the definition
- Participating Preferred StockA dreaded equity structure (often called 'double dipping') where an investor first gets their investment back…See the definition
- Option Pool (ESOP)A block of equity (typically 10-20%) reserved for future employees, advisors, and consultants.See the definition
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- EarnoutA provision in a startup acquisition where the sellers receive additional future payments based on the…See the definition
- Discount Rate (in Fundraising)A provision in a SAFE or Convertible Note that allows early investors to convert their investment into equity…See the definition
- Convertible NoteA form of short-term debt that converts into equity, typically in conjunction with a future financing round…See the definition
- Acqui-hireWhen a company is acquired primarily for the talent of its team, rather than its product, user base, or…See the definition
- EBITDAEarnings Before Interest, Taxes, Depreciation, and Amortization. A proxy for operating cash flow and core…See the definition
- Net IncomeThe company's total profit after subtracting all expenses, including COGS, operating expenses, interest, and…See the definition
From the blog
All postsRead beyond the obvious.
Ideas, field notes and founder lessons worth taking into your next decision.
- Why Your Cobbler Said No and Who Still Says YesQuick-fix counters reject complex welted footwear every day. Here is how to build a craft cobbling service for premium leather…Read the story
- selling social media caption templates for niche businessesDesign tools made graphics easy, but small business owners still spend hours staring at blank text boxes before posting.Read the story
- How to find your first paying customer without spending on adsYour first sale comes from people who already trust you, not from paid ads. Here is how to turn your contact list into paying…Read the story
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- 50 Flexible Business Ideas for Women Balancing Work and Life50 real flexible business ideas for women, home-based and India-focused, from BBI's own research library. Real links, no invented…Read the story
- 50 Realistic Small Town Business Ideas for Local EntrepreneursA walk through a small Indian town, stop by stop: the highway, the bazaar, the farm edge, the building site and the homes. 50…Read the story
- 50 High-Margin Online Business Ideas That Require Little Capital50 online business ideas grouped by how the margin is made: licensing, expert matching, urgent bookings, idle assets…Read the story