Why we built the tools
Every “bonus” page has a big number and small print. Every slot has an RTP nobody converts to euros. Every acca has a payout that doesn’t include tax. The six calculators above do the arithmetic the editorial team does before every review — and that every player should do before every bet.
What the results mean in practice
Expectation vs reality. “Expected return” is the average over millions of repetitions. In 500 spins you’ll land somewhere in the range — and high volatility means the range is very wide. That isn’t “bad”: it’s why slots are fun. Just don’t confuse the range with the expectation.
Margin = price. When you see a 4% margin on a 1X2, you buy every outcome 4% “dearer” than fair. Over a year with €2,000 turnover, the gap between 4% and 5% is €20 — a free slip a month. Fonbet is ~0.5% cheaper than average on big events; details in the betting review.
Rollover = cost. A bonus that “costs” more than it gives isn’t a bonus. The value calculator shows why 500 Free Spins at 1x are worth more than “€500” at 35x — even if it sounds backwards.
Tax = planning. The €100 and €500 thresholds per slip mean the way you structure slips changes your net. Ten singles of €90 profit: tax 0. One acca of €900: tax €180.
Sources and accuracy
RTPs from the providers and Fonbet’s “i” tabs; roulette payouts from standard Evolution/NetEnt rules; tax from Law 4002/2011 as in force in 2026. If you spot an error, contact us — we correct it with a date.
The tools are informational. 21+ | HGC | Betting is entertainment with a cost — responsible gaming.