The dumbbell bench press replaces the barbell with two independent weights, forcing each arm to control its own load through the full press. It trains the same muscles as the barbell version, the pectorals, front deltoids and triceps, but adds a stabilization demand and a longer range of motion, since the dumbbells can travel below chest level. Lifters use it to fix left-right strength imbalances, to get a deeper pec stretch, or when a barbell and rack are not available.
Log your dumbbell bench press sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.