Input the weight you lifted and the number of reps you did in the one-rep max calculator for the bench press above. Note 90% of your bench press one-rep max. You’re going to use this as your starting point to test your repetition maximum. Thoroughly warm up before your next bench press workout, then load the bar with 90% of your 1RM. If I get enough responses, maybe I can create a visual representation of the relationship between the two. EDIT: I have enough responses (38 usable data points) to post results . Essentially, barbell bench equals 2X dumbbell bench, plus 37 pounds. This roughly supports what someone suggested: "The rule of thumb is that the weight you put on

Beginner. Stronger than 5% of lifters. A beginner lifter can perform the movement correctly and has practiced it for at least a month. Stronger than 20% of lifters. A novice lifter has trained regularly in the technique for at least six months. Stronger than 50% of lifters.

For example, if you can press 100 pounds normally (around 10 repetitions) with a barbell, then you should use a total weight of 70 pounds when performing a dumbbell bench press, meaning a 35-pound dumbbell in each hand.
You can hit 80 kg for 6-8, try pausing for a second and a half on your chest before exploding back up. To add to this, not all sets need to be at 85 or 90. So if you do 4 sets of bench press, only 1-2 sets need to be at 85-90. Then the next week, try adding more reps to those 1-2 sets at higher weight.
On the leg press weight chart, we’ll be considering the “advanced” tier as a good leg press weight. The tier ranges quite a lot, with a 50kg male’s advanced weight of 187kg being the same as a 115kg male’s beginner weight. As the advanced tier is considered to be better than 80% of lifters, this is the same measurement we’ll use for
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how much should a 70 kg man bench press