120 Stamina = 1200 Coin (aka One Roll)FORUM
Just a reminder that, without boosters, it takes (on average) roughly 120 stamina to get enough coins for one "roll" in the ND. Or, 1 stamina = 10 Coins. It also takes 60 rolls or 72,000 coins to COMPLETELY clear a board. Use this to estimate how much stamina you'll need to finish the dungeon in the worst case scenario. Don't forget to include the 16,000 coins earned from daily missions. You can alter the conversion if you're getting a % boost. But I'd recommend underestimating by about 10%.