This is a coin budget calculator, not a drop-rate or game automation tool. Confirm the actual price in your current game. Bronze Shovel community reports disagree: 2,500 vs 3,000 coins.
Which price should I use?
One community source read on October 11 lists Bronze at 3,000 coins, while an earlier guide says 2,500 coins. If you see a different price in-game, it takes priority: simply edit the Price box. The calculator never claims to predict how many digs you need, because it does not have verified drop-rate and income data.
Make the most of your coins
First decide whether your bottleneck is digging permission or traveling to a new island. A shovel that covers a period will not automatically transport you there. Also watch for reported code rewards, but do not include unredeemed bonuses in your balance.