How do I calculate my own unit value?

See the below example if following the 100 unit BR methodology. 
$1000 Bankroll / 100 Units = a $10 unit size. Therefore, if you receive a tip that says ‘stake: 2 units’ you place $20 in accordance with your Bankroll. We recommend adjusting your unit sizes for every 10% increase or decrease in your Bankroll, to ensure you’re limiting risk, while maximising returns over time.