The calculation
Spendable = max(0, balance − reserve). Affordable purchases = floor(spendable ÷ price). The unused amount stays visible.
Islands Reborn Purchase Budget Calculator
Enter your balance, the live price of one purchase and the money you want to keep. Calculate how many equal-cost purchases fit before committing to an island project.
Your own live pricesReserve stays protectedCalculated in your browser
Your live values
Budget the next purchase
Use the price displayed in the game or player shop. This tool does not contain a market price list.
Calculated locally
Island purchase budget
Enter a non-negative balance and a price greater than zero. Read the actual price before buying.
The calculation uses your inputs only. It predicts neither future prices nor sale income, and it never asks for a Roblox login.
Use the actual purchase price
A player-shop offer is a price for that transaction. Enter it yourself instead of assuming a universal item value.
A budget is not a profit forecast
The result does not guarantee buyers, future resale value, crop output or the usefulness of a machine.
How the purchase calculator works
Does this calculator know item prices?
No. Enter a price you can actually see in the game or shop. The result is transparent budget arithmetic.
Why protect a reserve?
It lets you keep money for another project instead of using the entire balance on equal-cost purchases.
What if the purchase price changes?
Re-enter the price before buying. The calculation does not monitor a live shop.
Are my budget values sent to a server?
The calculation runs in your browser and does not use your Roblox account.