Working tools, real definitions, no fluff.

Calculators

Each calculator runs in your browser, shows the formula, and includes a worked example. Inputs are validated; results update live.

• ROI

  Simple and annualized return on an investment.

• Break-Even

  Units and revenue needed to cover fixed costs.

• Gross Margin & Markup

  The difference, with both calculations side-by-side.

• Loan Amortization

  Full payment schedule with principal/interest split.

• Customer Acquisition Cost

  CAC by channel, with blended and paid-only views.

• Customer Lifetime Value

  LTV with churn rate and gross margin inputs.

• LTV:CAC & Payback

  Unit-economics ratio plus months to recoup CAC.

• Runway & Burn Rate

  Cash on hand divided by net monthly burn.

• CAGR

  Compound annual growth rate between two points.

• Rule of 72

  Quick approximation for doubling time.

• Net Present Value

  Discounted cash-flow value of a project.

• Internal Rate of Return

  The discount rate that makes NPV zero.

• DCF Valuation

  Project a business value from forecast cash flows.

• Revenue Multiple Valuation

  Apply a sales multiple by sector and growth.

• EBITDA Multiple Valuation

  Enterprise value from EBITDA and a multiple.

• Lease vs. Buy

  Net present cost comparison for equipment or property.

• Payback Period

  Time to recoup an investment from its cash flows.

• Payroll Burden

  Fully-loaded employee cost beyond base salary.

• Cap Table Dilution

  Founder ownership through funding rounds.

• SAFE / Note Conversion

  Cap, discount, and post-money outcomes.

• Stock Option Value

  Intrinsic value with vesting schedule.

• Pricing

  Cost-plus, value-based, and competitor methods.

• Inventory Turnover

  Turns and days-sales-of-inventory.

• Working Capital & CCC

  Days inventory + receivable − payable.

• Profit Margins

  Gross, operating, and net margins together.

Frameworks

Plain-English explainers for the strategy, planning, and prioritization frameworks that actually get used in practice. Every page includes a worked example and the framework's known weaknesses.

• SWOT Analysis

  Strengths, weaknesses, opportunities, threats.

• Porter's Five Forces

  Industry attractiveness from five competitive pressures.

• BCG Growth-Share Matrix

  Stars, cows, dogs, question marks.

• Ansoff Matrix

  Four growth strategies by product and market.

• Lean Canvas

  One-page startup model from Ash Maurya.

• Business Model Canvas

  Osterwalder's nine-block model.

• OKRs

  Objectives and Key Results, from Andy Grove.

• RACI Matrix

  Responsibility assignment for cross-team work.

• Eisenhower Matrix

  Urgent/important quadrants for prioritization.

• PESTLE Analysis

  Political, economic, social, tech, legal, environmental.

• Value Chain Analysis

  Porter's primary and support activities.

• 4 Ps of Marketing

  Product, price, place, promotion.

• Jobs To Be Done

  What customers are really hiring your product for.

• North Star Metric

  The one metric that captures product value.

• Kano Model

  Classify features by their effect on satisfaction.

Glossary

Definitions clustered by topic, not scattered alphabetically. Each cluster includes formulas, examples, and cross-references between related terms.

• Accounting Fundamentals

  EBITDA, COGS, accrual vs. cash, deferred revenue.

• Startup Funding

  Pre-money, SAFE, 409A, liquidation preference.

• Equity & Compensation

  Vesting, ISO vs. NSO, RSUs, strike price.

• Business Entities

  LLC, S-Corp, C-Corp, B-Corp trade-offs.

• Sales & Marketing Metrics

  MQL, SQL, ACV, ARR, MRR, NRR, GRR.

• SaaS Metrics

  Churn, expansion, magic number, rule of 40.

• Financial Statements

  Income statement, balance sheet, cash flow lines.

• M&A Terminology

  LOI, due diligence, earn-out, escrow, R&W.

• Contracts & Legal

  NDA, MSA, SOW, indemnification, force majeure.

• Intellectual Property

  Trademark, copyright, patent types, trade secret.