The most reliable salary estimator is difficult to pinpoint definitively as there are numerous sources available with different methodologies and data collection methods. However, one widely regarded source for salary estimations is the Bureau of Labor Statistics (BLS), which provides comprehensive information on various occupations, including estimators. BLS gathers data from surveys and other official sources to provide estimates on median wages, employment levels, and more. Consulting reports from reputable recruitment agencies or professional associations specialized in construction estimation can also be reliable sources to obtain accurate salary information.