Smarter Trades - Free Betfair Trading Tools

Free calculators for exchange bettors – no login, no cost.

Tools & Calculators

Use these calculators to price trades, hedge accurately, and manage bankroll risk. Every tool runs in your browser and supports Betfair exchange logic.

Written by Alex Carter · Last reviewed:

About our calculators

Every calculator on Smarter Trades runs entirely in your browser. There is no login, no account, and no data sent to a server — your inputs stay on your device. Each tool is built from standard mathematical formulas used in probability theory, bankroll management, and exchange trading, and has been verified against hand-calculated worked examples before publication.

The calculators are designed to help you understand the numbers behind a trade before you commit real money. They are educational tools, not tipster services — the inputs come from your own analysis and judgement.

Which calculator should I use?

Lay Liability Calculator

Shows the exact liability for lay bets so you know the maximum downside.

  • Check risk before laying a selection.
  • Compare liability vs potential profit.
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Fix-a-Bet Calculator

Adjust stake size to reach a target return or desired profit figure.

  • Plan stakes for a specific payout.
  • Reverse engineer your stake size.
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Back/Lay Hedge Calculator

Calculate hedge stakes to green up and lock in profits across outcomes.

  • Balance profit after odds move.
  • Plan exits for back-to-lay trades.
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Expected Value (EV) Calculator

Calculate EV to understand whether a price is profitable over the long term.

  • Compare your probability vs market odds.
  • Filter for +EV decisions.
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Dutching Calculator

Split stakes across multiple outcomes to level profit.

  • Cover multiple selections in one market.
  • Plan stakes to equalise returns.
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Kelly Staking Calculator

Find the optimal stake size based on your edge and bankroll.

  • Apply Kelly staking to exchange prices.
  • Keep growth consistent and measured.
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Matched Betting Calculator

Compare bookmaker offers with exchange lays to lock in qualifying profit.

  • Work out lay stakes for promos.
  • Measure qualifying loss quickly.
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Acca Calculator

Calculate combined returns on accumulator bets and parlays.

  • See payout projections across legs.
  • Compare acca vs single stakes.
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Odds Converter

Convert odds between decimal, fractional, and implied probability.

  • Translate odds quickly between formats.
  • Check implied probability on the fly.
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