Understanding two bet types is the key that makes every tool make sense.
SNR — Stake Not Returned (bonus bets / free bets)
The bonus stake is not returned; you only keep the winnings. So a $100 SNR bonus at +100 (2.00) only nets you $100 profit, not $200. Use SNR bonuses at higher odds to extract more value — that's why the tools sort by "SNR value".
SR — Stake Returned (your own cash)
Your stake is returned if you win — like a normal bet. Use SR bets at lower odds for the best conversion. You'll place SR bets for deposit-match turnover, qualifying bets, and "mug" bets.
The Bonus Edge Converter handles both — just tell it whether your bonus is a free bet (SNR) or cash (SR).