Broly is one of the most powerful Saiyans in the Dragon Ball universe, with strength that surpasses many major characters. Here is a detailed overview of his power:

• Broly was born with an exceptionally high base power level of around 10,000, which is already far above most Saiyans at birth

• Transforming into a Super Saiyan multiplies his power dramatically. For example, a Super Saiyan transformation is said to amplify power by 50 times, so even as a baby, Broly's Super Saiyan form could reach around 500,000 power level

• Broly's Legendary Super Saiyan (LSSJ) form is stronger than Super Saiyan 2, and estimates suggest it could triple the power of the base Super Saiyan form, putting Broly’s power in the billions (around 1.5 billion as a baby LSSJ)

• As an adult, Broly's base power is speculated to be about 1,000 times stronger than his baby form, potentially reaching a base power of 10 million, with LSSJ form reaching over 1.5 billion, making him stronger than many iconic villains like Frieza in his second form and even comparable or superior to Perfect Cell

• In Dragon Ball Super, Broly is shown to be stronger than Goku and Vegeta in their Super Saiyan Blue forms during their initial fight, though Gogeta (fusion of Goku and Vegeta) in Super Saiyan Blue is more powerful than Broly

• Broly’s strength increases the longer he fights, and he has immense potential that grows with rage and battle experience. His power is described as monstrous, capable of overwhelming even the strongest fighters like Goku and Vegeta after their Universal Survival Tournament victory

• After training on Beerus’ Planet, Broly has learned to better control his strength and aggression, making him an even more formidable warrior

• Overall, Broly is considered one of the strongest Saiyans in history, with power scaling that could reach complex multi-versal levels depending on interpretations

In summary, Broly’s strength is immense, ranging from billions in power level estimates in his Legendary Super Saiyan form, surpassing many top-tier characters, and continuing to grow with training and combat experience. He is stronger than Goku and Vegeta individually in their Super Saiyan Blue forms but is outmatched by their fusion Gogeta at that level