10 Free Betfair Calculators
Dutching, green-up, lay liability, EV, commission and more — all run in your browser. No signup, no tracking.
10 free calculators
Free Betfair trading calculators for dutching, green-up, lay liability, expected value, commission and more. Every tool runs locally in your browser — no account, no download, no tracking.
Zero downloads. All maths runs locally — your inputs never leave your device.
Tuned for Betfair back/lay mechanics, tick sizes, and commission rates.
Every tool connects to a strategy guide so you can apply what you calculate.
Strategy guides that use these tools
See the calculators in action.
Frequently asked questions
Do I need a Betfair account to use these calculators?
No. All calculators work with any decimal odds. They are useful for planning trades on any exchange or bookmaker before you place anything.
Are my inputs stored or tracked?
No. Every calculation runs locally in your browser. We do not store your stakes, odds, or any inputs — no login required.
What is the difference between the green-up and liability calculators?
The liability calculator tells you the maximum you can lose on a lay bet before placing it. The green-up calculator tells you what lay stake to place after your initial trade to lock in an equal profit regardless of outcome.
Which calculators should I use for Lay the Draw?
Start with the back/lay liability calculator to understand your exposure. Once a goal is scored, use the green-up calculator to lock in profit. The stop-loss tick calculator sets your bail-out level if no goal arrives.
Do the calculators include Betfair commission?
Yes — all calculators that show net profit include a commission field (default 5%). Change it to your actual rate; premium charge payers and high-volume traders are often on lower rates.
Disclaimer: These calculators are for educational and planning purposes only and do not constitute financial or betting advice.