The budget formula
Spendable = max(0, balance − reserve). Purchase count = floor(spendable ÷ entered cost). This counts purchases at the same cost.
Survive a Million Monkeys Gems Budget Calculator
Enter your Gems balance, the displayed cost of a class purchase and the reserve you want to keep. This tool calculates how many equal-cost purchases fit. It does not supply class prices, earning rates or upgrade effects.
Your entered costsReserve protectedCalculated in your browser
Your budget
Check a purchase against a reserve
Use the exact requirement shown for the purchase you want. Equal-cost arithmetic does not predict changing upgrade prices.
Calculated locally
Class purchase budget
Enter a non-negative Gems balance and a cost greater than zero from your chosen purchase.
Values are calculated locally and are not sent as form submissions. General site analytics are described in the Privacy Policy. No Roblox account is connected.
Use the actual purchase requirement
Class unlocks and upgrades are different goals. Read the price for the exact action you plan to take rather than using another class’s amount.
Changing costs need a new calculation
If an upgrade changes the next price, enter that next price separately. The tool does not forecast Gem income, class effects or a time to afford the target.
Budget questions
Does the calculator know class prices?
No. Enter the requirement displayed for your intended class action. The tool performs arithmetic on your inputs.
Can it predict a sequence of changing upgrade costs?
No. The count assumes the entered cost stays the same. Recalculate when the next price changes.
Does it access my Roblox balance?
No. You enter the amount yourself. The calculator does not log into Roblox or verify a purchase.