Transparent arithmetic
Available = max(0, balance minus reserve). Quantity = floor(available divided by unit cost). Leftover coins remain visible.
Prehistoric Farm Purchase Budget Calculator
Enter your coin balance, a current unit price and the coins you want to keep. Calculate an affordable quantity for equal-cost food or other repeat purchases. Use the actual offer; the tool does not predict fossils or creature rarity.
Your current pricesProtected reserveLocal arithmetic
Your shop values
Plan purchases and keep a reserve
Use coins for both balance and cost. Enter one unit price; a mixed cart or changing upgrade price needs separate calculations.
Local arithmetic
Equal-cost purchases budget
Enter a non-negative balance and a cost greater than zero, both measured in coins.
Values stay in the browser calculation. The tool does not access a Roblox account or verify your game balance.
Use one actual price
Enter the current cost for a repeat purchase, such as compatible food. The blank price avoids treating a changing offer as fixed.
A worked example
If your chosen balance is 100, reserve is 20 and entered unit cost is 8, the tool allows 10 items with no available coins left. This arithmetic does not say how much Belly each food restores.
Calculator scope
Does this predict how many meals fill Belly?
No. It calculates a purchase quantity from your inputs; food restoration is not established.
Can I use a boat or slot price?
You can compare the price with your budget, but each distinct one-time upgrade needs its own cost. Do not interpret quantity as repeated purchases of the same unlock.
Does it calculate rare fossil odds?
No. It uses transparent budget arithmetic and does not predict game rewards.
Does it access Roblox?
No. The calculation uses only the values you enter in your browser.