To compare a spawner investment, you need an output estimate and a price at which the resulting items could sell. Estimated production and completed sales are different information. The DonutAtlas calculator separates these steps: spawner count and stack layout determine estimated output, while your chosen sale target creates the revenue scenario.
1. Enter count and stack layout
Output may not grow linearly when spawners share one block. For example, keeping 64 spawners in one stack may produce a different model result from splitting them into two stacks. Enter the number of stacks as well as the total spawner count. Results outside the measurement range marked in the calculator rely on extrapolation.
2. Separate measurements from the model
Skeleton bone output uses a curve based on community measurements. For other mobs, the same curve is adapted to the main drop; this does not mean each mob was measured independently. Enter your own measured rate for one spawner if farm conditions or server rules have changed. Count the output, record the elapsed time and evaluate secondary drops separately.
3. Check hourly output
As an example, a farm producing 1,500 sellable items in 15 minutes yields 1,500 × 60 ÷ 15 = 6,000 items per hour. This is an illustrative measurement, not a universal DonutSMP production rate. Take several samples at different times to compare the effects of server load and item collection.
4. Choose a usable sale price
Premium market data lets you compare the highest observed /orders offer with /ah listings. Remaining order demand may not cover your entire output, and an AH listing is not a completed sale. Check the data timestamp, item variant and listing quantity. Do not confuse the price of a spawner cage with the price of bones or another produced item.
5. Convert revenue into net profit
Hourly gross revenue = hourly output × target price per item. For example, 6,000 items at 2 units of game currency produce 12,000 gross. An assumed five percent deduction costs 600; with another 400 in hourly costs, the net scenario is 11,000. Five percent is a calculation assumption here, not a verified DonutSMP fee. Adjust it to the actual in-game conditions.
6. Calculate payback and price risk
An initial investment of 110,000 and hourly net of 11,000 imply a theoretical ten-hour payback. Zero or negative net income has no finite payback. If the example sale target falls to 1.5, the same five percent deduction and 400 costs leave 8,150 per hour, or roughly 13.5 hours to pay back. Account for lower prices and unsold stock before relying on one result.
Save your inputs and measurement time. Returning to the calculator with the same conditions lets you compare price and output changes separately. These examples explain the method; they are not realized income or guaranteed returns.