Business & freelance tools

Free calculators for founders and freelancers — startup costs, pricing and margins, break-even, LLC vs S-corp, self-employment tax, and runway. Every tool shows real numbers.

27 resources

Calculator Amazon FBA Profit Calculator Estimate your net profit per unit on Amazon FBA after referral fees, fulfillment fees, and product cost. Open → Calculator Break-Even Units Calculator Find how many units you must sell to cover fixed costs, using price and variable cost per unit. Open → Calculator Cash Conversion Cycle Calculator Measure how many days your cash is tied up in operations using inventory, receivable, and payable days. Open → Calculator Churn Revenue Impact Calculator See how much revenue monthly churn costs you each month, each year, and as an annual churn rate. Open → Calculator Customer Acquisition Cost (CAC) Calculator Calculate what it costs to acquire one customer from your total sales and marketing spend. Open → Calculator Customer Lifetime Value (LTV) Calculator Estimate the gross-profit lifetime value of a customer from monthly revenue, margin, and churn. Open → Calculator Etsy & Shopify Fee Calculator Calculate your net profit after listing, transaction, and payment-processing fees on a marketplace sale. Open → Calculator Freelance Hourly Rate Calculator Work out the hourly rate you must charge to hit your income target after expenses and non-billable time. Open → Calculator Gross Margin Calculator Calculate gross profit and gross margin percentage from revenue and cost of goods sold. Open → Calculator Investment Payback Period Calculator Find how long it takes a business investment to pay for itself from its monthly cash flow. Open → Calculator Invoice Late Fee Calculator Calculate the late fee owed on an overdue invoice from the balance, monthly rate, and days late. Open → Calculator LLC vs S-Corp Tax Savings Calculator Estimate the self-employment tax you could save by electing S-corp status and paying yourself a reasonable salary. Open → Calculator LTV:CAC Ratio Calculator Compare customer lifetime value to acquisition cost to judge whether your growth is profitable. Open → Calculator Margin to Markup Converter Convert a target gross margin into the markup percentage you must apply to cost. Open → Calculator MRR to ARR Growth Calculator Convert monthly recurring revenue to annual recurring revenue and project 12-month growth. Open → Calculator Net Profit Margin Calculator Calculate net profit and net profit margin from total revenue and total expenses. Open → Calculator Pricing Markup Calculator Turn a unit cost and a markup percentage into a selling price, profit per unit, and gross margin. Open → Calculator Quarterly Estimated Tax Calculator Estimate your quarterly estimated tax payment from expected income, deductions, and your tax rate. Open → Calculator Return on Ad Spend (ROAS) Calculator Measure your return on ad spend and the true net ROI after cost of goods on ad-driven revenue. Open → Calculator Sales Tax Calculator Calculate combined state and local sales tax on a sale and the total the customer pays. Open → Calculator Self-Employment Tax Calculator Estimate the Social Security and Medicare self-employment tax on your net business earnings. Open → Calculator Startup Cost Estimator Estimate what it really takes to launch a business: one-time costs, an operating reserve, and a safety buffer. Open → Calculator Startup Runway Calculator Calculate how many months of runway you have from cash on hand and your net monthly burn. Open → Calculator True Cost of an Employee Calculator See the real annual cost of a hire beyond salary: benefits, payroll taxes, and overhead. Open → Guide How to Price for Profit: Break-Even, Margin, and Markup Markup and margin are not the same number, and confusing them quietly kills profit. See how to find your break-even units, set a price with a target margin, and translate markup into the margin you actually keep. Open → Guide LLC vs S-Corp: Which Saves You More on Taxes? An LLC pays self-employment tax on every dollar of profit; an S-corp election can carve out payroll tax on the part you take as a distribution. See the exact break-even, a worked example, and where the savings actually come from. Open → Guide Self-Employment Tax: What You'll Really Owe (and How to Plan for It) Self-employment tax is 15.3% on top of income tax, and it surprises new freelancers every April. See exactly how it is calculated, the deductions that shrink it, and how to set aside the right amount each quarter. Open →