Revenue EconKit Blog
Long-form guides on the math behind every calculator.
Plain-English explanations of pricing, profit margins, freelance economics, and SaaS unit economics — each post tied to a tested calculator so you can run the numbers on your own inputs.
Pricing How to Price Freelance Projects Without Leaving Money on the Table
A practical framework for converting your hourly rate into fixed-fee project pricing. Includes complexity multipliers, risk buffers, and a worked example.
Pricing Freelance Pricing in 2026: How to Set Rates That Actually Sustain Your Business
A freelance pricing framework that accounts for overhead, taxes, unbillable time, and profit margin. Not just hourly rates — project pricing, retainers, and value-based models.
E-commerce Hidden Amazon Seller Costs That Most Profit Calculators Miss
Beyond referral fees and FBA fees, Amazon sellers face at least eight additional cost lines. Here is every one, what it costs, and how to model it.
Growth Metrics Break-Even Analysis for Startups in 2026: When Burn Becomes Profit
Most startups calculate break-even once in a pitch deck and never revisit it. Here is how to model it properly, the benchmarks by industry, and the three levers that move it.
Profitability Cash Flow for Small Businesses in 2026: Why Profitable Companies Run Out of Money
Profit is an accounting concept. Cash is what pays the bills. The timing gap between the two kills more small businesses than bad margins do. Here is how to model it and the benchmarks that matter.
Employment Contractor vs Employee in 2026: The Real Cost Comparison Most Businesses Get Wrong
A $50/hour contractor looks more expensive than a $95,000 salary. It is usually cheaper. Here is the full cost comparison and the breakpoints where each option wins.
E-commerce Dropshipping Profit Margins in 2026: The Real Numbers After Every Cost
Dropshipping margins look great on paper — no inventory, no warehouse. The five hidden cost lines between gross margin and real profit tell a different story. Here are the benchmarks and the math.
E-commerce eBay Seller Fees in 2026: Every Cost Between Sale Price and Profit
eBay charges four distinct fee layers on every sale. Most sellers track one or two. Here is the full fee stack, category-specific rates, and how to model real per-item profit.
Freelance Taxes in 2026: The Self-Employment Tax Stack Most Freelancers Undercount
Freelancers owe more tax than employees on the same income. The 15.3% self-employment tax is the biggest line, but not the only one. Here is the full tax stack and deduction strategies.
Growth Metrics How to Calculate ROI in 2026: The Formula, the Pitfalls, and What Good Looks Like
ROI is the most-used and most-abused metric in business. The formula is simple. The inputs are where teams go wrong. Here is how to calculate it honestly, with benchmarks by investment type.
Pricing How to Price a Product in 2026: Three Strategies and the Math Behind Each
Cost-plus, competitive, and value-based — three pricing strategies that give different prices for the same product. Here is when each one applies, the formulas, and 2026 benchmarks by category.
How to Value a Small Business in 2026: Three Methods and When Each One Applies
Business valuation is not one formula — it is three frameworks that give different answers. Here are the methods, the multipliers by industry, and a worked example through each.
Employment The True Cost of Hiring an Employee in 2026: Beyond the Salary Number
An employee who earns $70,000 costs the business $91,000-$105,000. The gap comes from seven cost lines that sit outside the offer letter. Here is the full stack and the benchmarks by role type.
E-commerce How to Calculate Amazon FBA Profit: A Step-by-Step Breakdown
Walk through each fee line that sits between your Amazon selling price and your actual profit. Worked example with real numbers and a free calculator.
E-commerce Amazon FBA Fees in 2026: The Full Cost Stack Most Sellers Undercount
Amazon takes six separate cuts from every FBA sale. Most sellers track three. Here is the full fee stack, what each one costs, and how to model real profit.
Pricing Markup vs Margin: The One Pricing Mistake That Costs Businesses Thousands
Markup and margin use the same two numbers but measure different things. Confusing them misprices your product. Here is the difference, the conversion math, and 2026 benchmarks.
E-commerce Amazon Seller Profit Margins by Category: 2026 Benchmarks
Realistic net profit margins for Amazon sellers across 12 product categories. Data-backed benchmarks to evaluate whether your margins are healthy or at risk.
Growth Metrics Vibe a Business (4/4): The Only Metrics That Matter After You Ship
You launched. People are paying. Now what? The seven numbers every solo SaaS founder needs to track, what healthy looks like, and when to worry.
E-commerce FBA vs FBM: Which Amazon Fulfillment Method Is More Profitable in 2026?
Side-by-side cost breakdown of FBA vs FBM fulfillment. Compare fees, shipping costs, and real profit margins to choose the right model for your Amazon business.
Growth Metrics Burn Rate vs Runway: How to Read the Room
Runway is the wrong number to optimize. Default Alive, burn multiple, and the three levers that move runway more than cutting costs.
Growth Metrics CAC vs LTV: The Only SaaS Ratio That Matters (and the Four Ways It Lies)
The 3:1 ratio everyone quotes, the four structural traps that catch teams who have already cleared the basics, and the payback-period sanity check you should run alongside it.
E-commerce Shopify Profit Margins in 2026: Four Costs Beyond the Dashboard Number
The four costs that live outside Shopify's headline number — variable COGS, payment processing, shipping loss, and ad spend — and how each one compounds into your real 2026 margin.
Growth Metrics What Is a Healthy SaaS Profit Margin in 2026?
The three margins SaaS founders should track, the Rule of 40 sanity check, and what "healthy" actually looks like at seed, Series A, and scale.
Freelancing Freelance vs Full-Time: When the Math Actually Works
Most freelance-vs-employee comparisons compare the wrong numbers. The honest math, the hidden costs on both sides, and the hourly rate you need to actually break even with an $85K salary.
Freelancing How to Set Your Freelance Rate in 2026: A Data-Backed Guide
The math, the benchmarks, and the four traps that quietly destroy freelance margins. With country-specific tax tables and a worked example anchored to real 2025 freelancer data.
Freelancing How to Raise Your Freelance Rate Without Losing Clients
The retention math most freelancers never compute. Why a 25% rate hike still leaves you ahead even if 1 in 5 clients walks, plus a 60-day notice template and the five client tiers.
Welcome to the EconKit blog
What this blog is for, how it connects to the calculators, and what you can expect to find here.
Pricing Vibe a Business (3/4): Pricing AI-Powered Products When Every User Costs You Money
Fixed monthly pricing with variable AI costs is a recipe for losing money on your best customers. Here are four pricing models that actually work for AI products, with worked examples.
Growth Metrics Vibe a Business (2/4): The Token Tax — Why Every AI Feature Costs More Than You Think
Traditional SaaS has near-zero marginal cost per user. AI-powered SaaS does not. Here is what the token tax looks like, how it erodes margins at scale, and how to model it.
Pricing Vibe a Business (1/4): The Economics AI Coding Tools Won't Teach You
Vibe coding made building easy. Business is still hard. A framework for solo builders who can now ship in a weekend but need to know if the math works before they start.
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