A calculator will only get you in the ballpark, +/- 10% at best, always check a new/changed setup with a watt-meter.E-flight calculators, a compilation
To trust is good, to calculate is better, to measure is a must.
Without a watt-meter you are in the dark, until something starts to glow
A watt-meter will more than pay for itself, several times over, your battery, ESC and motor will love you for it. After calculating, always check current when you have a new/changed setup. Will also help you find optimal setup.