A progressive jackpot is worth its size divided by the odds of hitting it. That one division answers most questions about whether a jackpot game is worth playing, and it is the calculation almost nobody does, mostly because the odds are almost never published.
Above break-even does not mean you will win. The expected spins figure above shows the scale. A positive expected value spread across one in 15 million spins is a number, not a plan, and almost everybody who plays into it loses.
The base game return is the input most people get wrong. If a game publishes one combined figure, that figure already includes the jackpot at its seed value, so the base game on its own is lower. Entering the combined figure will make every result here look better than it is.
Eligibility changes everything. If your stake is below the threshold that qualifies for the jackpot, the jackpot contribution is zero and the only number that applies to you is the base game return.
Shared pools are shared. The jackpot value per spin assumes you are the one who hits it. Where thousands of players feed the same pool, your share of the chance falls as activity rises, and activity rises fastest when the jackpot is large.
The jackpot amount is on screen. The stake is yours. The two hard ones are the odds and the base game return.
Most operators do not publish jackpot trigger odds, and no major regulator requires them to. If you cannot find the odds, this calculator cannot help you, and the correct conclusion is that you are being asked to buy something whose price is not disclosed.
The base game return is sometimes published separately from the jackpot and sometimes folded into one figure. Where only one figure is given, it includes the jackpot, so treat the base game as lower.
Read more: how a progressive jackpot actually works, what the odds on a jackpot really are and does the jackpot lower the RTP of the base game.