The calculation
Spendable = max(0, balance − reserve). Purchases = floor(spendable ÷ entered price). The result also shows the remainder and target shortfall.
Harpoon a Fish Purchase Budget Calculator
Enter a balance, one current price and the amount to keep. Calculate equal-price purchases before choosing a table, aquarium, equipment or custom spending goal.
Your entered priceReserve protectedBrowser-local arithmetic
Your live values
Set a spending limit
Use one displayed price for equal-cost purchases. If a later upgrade changes price, calculate again with that price.
Calculated locally
Custom purchase budget
Enter a non-negative budget and a cost greater than zero. The cost should come from the live game panel.
Arithmetic runs in your browser from the values you enter. The tool does not read a Roblox account balance.
Use the current price
Table, aquarium and slot prices can depend on the offer or progression. Enter the amount shown for the purchase you intend.
Affordability and outcome
This is equal-cost arithmetic. It does not predict a crate reward, a future upgrade price or the effect of an optional purchase.
Purchase-budget questions
What does the result count?
Equal-price purchases that fit after protecting the reserve, plus the remainder and any shortfall to your target.
Does the calculator supply game prices?
No. Enter the offer you see. Calculate again if a later upgrade changes the cost.
Does it retrieve my Roblox balance?
No. The values are entered by you and the arithmetic runs in your browser.