Business Calculators
Our free UK business calculators help sole traders, small businesses, and freelancers analyse profitability, plan pricing, and evaluate business decisions. All tools are designed around the way UK businesses actually operate, using HMRC-aligned figures and standard business accounting principles.
Running a profitable business requires understanding your margins, knowing your break-even point, and making smart decisions about pricing and costs. These calculators give you the clarity you need without needing a spreadsheet or an accountant for every quick calculation.
- ✓Calculate profit margin and markup on products and services
- ✓Find your break-even point in units or revenue
- ✓Measure return on investment (ROI) for campaigns or projects
- ✓Estimate ecommerce profit after fees, shipping, and VAT
- ✓Compare contractor day rates against equivalent PAYE salaries
- ✓Assess IR35 inside vs outside determination implications
All Business Calculators
Ecommerce Profit Calculator UK — Profit After Fees
Calculate your actual profit per order after product costs, shipping, platform fees, and advertising spend. Works for Shopify, Amazon, eBay, and Etsy.
Contractor vs Employee Calculator UK
Compare your take-home pay as a PAYE employee vs a contractor operating through a limited company. Includes IR35 considerations.
IR35 Calculator UK 2026/27 — Inside vs Outside Take-Home
See exactly how much more you take home outside IR35 vs inside IR35. Enter your contract day rate and get a side-by-side comparison in seconds.
Which Business Calculator Do You Need?
Start with the question you are trying to answer. To check whether a product or service actually makes money, use the profit margin calculator for gross and net margin, then the markup calculator to set a selling price that hits your target. A 50% markup is only a 33% margin — one of the most common pricing mistakes small businesses make.
Launching something new? The break-even calculator shows how many sales you need before fixed costs are covered, and the ROI calculator tells you whether a campaign, hire or piece of equipment pays for itself. Online sellers should run the ecommerce profit calculator, which takes off platform fees, payment processing, shipping and VAT so you see profit per order rather than revenue.
Contractors and employers have different questions. The IR35 calculator compares take-home pay inside and outside IR35 at 2026/27 rates, the contractor vs employee calculator shows whether a day rate beats a permanent salary, and the salary sacrifice calculator shows what pension or electric car schemes save you and your staff. For the detail behind the numbers, read our guides to profit margin, break-even point and IR35.