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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.
- 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
- Product-Led Growth Onboarding: Driving Rapid ActivationIn a PLG model, your product must sell itself. This means the onboarding experience is your primary sales rep. If users do not…Read the guide
- 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
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- 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
- Calculating Customer Lifetime Value (CLTV) in SaaSCustomer Lifetime Value (CLTV) is the ultimate metric for SaaS unit economics. It determines exactly how much you can afford to…Read the guide
- Business Idea Validation Framework: Test Before You BuildThe graveyard of startups isn't littered with bad ideas, but with unvalidated ones. Founders, blinded by conviction, often build…Read the guide
Startup glossary
Full glossaryBig ideas. Plain words.
The terms you will meet along the way, explained in plain language.
- Net Revenue Retention (NRR)The percentage of recurring revenue retained from existing customers over a period, factoring in downgrades…See the definition
- Gross Merchandise Value (GMV)The total dollar value of merchandise sold over a given period through a customer-to-customer or e-commerce…See the definition
- Return on Investment (ROI)A performance measure used to evaluate the efficiency of an investment or compare the efficiency of multiple…See the definition
- Total Addressable Market (TAM)The total global or regional market demand for a product or service, calculated as the maximum possible…See the definition
- Valuation CapThe maximum effective valuation at which a SAFE or Convertible Note will convert into equity, protecting…See the definition
- Gross ProfitThe profit a company makes after deducting the costs associated with making and selling its products.See the definition
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- Option Pool (ESOP)A block of equity (typically 10-20%) reserved for future employees, advisors, and consultants.See the definition
- Gross Revenue ChurnThe percentage of recurring revenue lost due to cancellations and downgrades over a given period.See the definition
- Total Contract Value (TCV)The total revenue expected from a contract across its entire duration, including one-time fees and…See the definition
- LTV:CAC RatioThe relationship between the lifetime value of a customer and the cost to acquire them. It measures the ROI…See the definition
- Single Sign-On (SSO)An authentication scheme that allows a user to log in with a single ID and password to any of several…See the definition
- DilutionThe decrease in existing shareholders' ownership percentage of a company as a result of the issuance of new…See the definition
From the blog
All postsRead beyond the obvious.
Ideas, field notes and founder lessons worth taking into your next decision.
- The Packing Error That Ends a Subscription Box CompanySelling software to subscription box founders lets you build recurring income without buying, storing, or shipping physical…Read the story
- 50 Realistic Part-Time Business Ideas for Extra Income50 part-time business ideas sorted by the hours you actually have: evening laptop work, weekend jobs with tools, teaching, food…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
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- 50 Side Hustle Ideas You Can Run After Your Day Job EndsFifty side hustles that fit around a 9 to 6 job: evening desk work, weekend jobs with your hands, and seasonal gigs, each linked…Read the story
- Five Contradictory Answers and Real LiabilityFree forums give dangerous advice to trade professionals carrying legal liability. Here is how to build a paid community focused…Read the story
- 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