Yes — here's the manual method, the arithmetic you'll be doing yourself, and the specific point at which doing it by hand stops paying.
FAQ
Do I need to pay for matched betting software?No. The method works with a calculator, and starting manually teaches you what each number does. A subscription buys time — mainly the time spent hunting for close back-lay matches — rather than any capability you lack.
What's the formula for a free bet lay stake?For a stake-not-returned free bet: lay stake = back stake × (back odds − 1) ÷ (lay odds − commission), with commission as a decimal. For a qualifying bet where the stake is returned, use back odds rather than back odds minus one.
Should I place the back bet or the lay bet first?The back bet first. Bookmaker prices move more readily than exchange lay prices on liquid markets, and holding a lay with no back bet behind it is an open, uncovered position.
Is a free oddsmatcher good enough?For working through welcome offers slowly, often yes. The gap between free and paid tools is coverage and speed rather than correctness — a paid tool scans more markets more often, which matters most when you have a lot of offers to get through before accounts get restricted.