# 🧮 Calc tab (/validator-monitor/calc-tab)
The Calc tab is a validator profit model. Enter a stake, commission and costs, and it estimates yearly net profit in SOL and US dollars. Use it to test a commission change before you make it, find your break-even stake, or size up a new validator before you run one.
The calculator combines input settings, including the inflation schedule, with a yearly profit result (Figure 17.7).
Figure 17.7: Calc tab: inputs with the inflation schedule toggle, and the yearly profit result
## Inputs [#inputs]
Start from a preset. Defaults loads a standard set of starting values. The second option, named after the validator you are viewing, loads its real numbers. Then adjust any field:
* Active stake (SOL) and commission (%).
* Inflation schedule: today's inflation rate, with a choice between the current schedule (15% disinflation per year) and SIMD-0550 (30% per year). The app shows the average rate for the next three years. Profit uses the first year.
* Block rewards per block and MEV tips per block (SOL), and your MEV commission (%).
* Leader slots per epoch: worked out from your stake.
* Admission ticket: 0.8 SOL per epoch. Under Alpenglow, this Validator Admission Ticket replaces vote transaction fees as the cost of voting.
* Server cost per month (USD).
* SOL price (USD).
## The result [#the-result]
Yearly shows your SOL net profit per year and its value in US dollars, broken down into:
* Revenue: commission from inflation rewards, block rewards and MEV.
* Costs: admission tickets and server costs.
The result assumes a slot time, which the app shows under the result.
The Calc tab is a projection from the numbers you enter, not a promise of future earnings. Inflation, fees, MEV, SOL price and your stake all change over time.