Dumbbell Bench Press 1RM Calculator

Your flat dumbbell bench press max and working weights

Choose one dumbbell using the each-hand weight. Use the pair total only when comparing with a record that counts both dumbbells together.

How to count weight for flat dumbbell bench press

Enter the weight from a hard, consistent flat-bench dumbbell set and say whether it means one dumbbell or the combined pair. The calculator treats equal dumbbells as a per-hand input with a pair total of twice that amount, so keep the selected convention with the result.

Use the same flat-bench setup, repetitions, unit, and technique when comparing. An optional equipment increment applies to one dumbbell, even when your entry represents both; incline and barbell bench results are separate exercises.

Weight unit

Choose the unit shown on your weights.

Weight lifted

Enter the weight used for your completed set, following the weight convention below.

Repetitions completed

Enter 1–10 full repetitions from a hard set with consistent technique.

Repetitions to estimate

Choose how many repetitions you want to estimate a weight for, from 1 to 10.

Percentage of your estimated max

Enter the percentage weight you want to calculate.

Available weight increase

Leave blank for an unrounded estimate, or enter the increase available for one dumbbell, even when entering both dumbbells combined.

How are you counting the weight?

Choose the description that matches the number you entered. Keep this choice the same when comparing results.

Estimated flat dumbbell bench press weights across repetition targets

The curve uses the same per-hand or combined-pair convention as the answer. It compares estimated rep targets and does not prescribe a sequence of dumbbell sets.

The example below shows how to read the graph. Your graph updates after you calculate, and the complete values remain available in the table beneath it.

How this flat dumbbell bench press estimate is calculated

The result uses only the values you enter and the method shown below. Rounded workout values stay separate from the underlying calculation.

A checked flat dumbbell bench press example

This checked example uses pounds. It comes directly from the same calculator that produces your result.

Select “Use example” to load these values. If you choose kilograms in the calculator, the chart and personalized tables recalculate in kilograms.

Method and equipment limits for flat dumbbell bench press

Use this as a repeatable estimate, not proof of your true one-rep max. The available study used to check the Brzycki equation tested free-weight bench press in 103 college women. That study checks the equation in that setting; It did not test flat dumbbell bench press. Dumbbell stability and the each-hand or pair convention can change the comparison, so keep both with the result. Use a hard set of 1–10 full repetitions. Stopping early can understate the estimate, and this calculator does not accept higher-repetition sets.

• Strength Testing—Predicting a One-Rep Max from Reps-to-Fatigue — Matt Brzycki (1993).
• Accuracy of Prediction Equations for Determining One Repetition Maximum Bench Press in Women Before and After Resistance Training — Mayhew et al. (2008).
• Guide for the Use of the International System of Units (SI) — NIST (2008).

Choose a related flat dumbbell bench press task

Have a flat dumbbell bench set and want its barbell comparison? Estimate barbell bench strength from a dumbbell set. This conversion gives an estimated barbell max; it does not replace a real barbell result.

• Dumbbell Bench Press Live Endura

  Explore dumbbell bench standards separately from your estimated rep-max task.

• RPE Calculator

  Record how close the completed dumbbell set felt to its repetition limit.

• Warm-Up Set Calculator

  Build your chosen warm-up sequence using the same dumbbell convention.

• Dumbbell Shoulder Press 1RM Calculator

  Calculate a shoulder-press set separately; this is not a bench-to-press conversion.

• Weighted Dip 1RM Calculator

  Record a weighted-dip set with its different bodyweight-and-added-weight convention.