Front Squat 1RM Calculator

Calculator Inputs

Example Data Table

Formula Used

The calculator estimates a front squat one-rep max from your completed set. It first converts load into effective reps using RPE. Effective reps equal completed reps plus reps in reserve. Reps in reserve are estimated as 10 minus RPE.

Epley: 1RM = weight x (1 + effective reps / 30)

Brzycki: 1RM = weight x 36 / (37 - effective reps)

Lombardi: 1RM = weight x effective reps^0.10

Mayhew: 1RM = 100 x weight / (52.2 + 41.9 x e^{-0.055 x effective reps})

O'Conner: 1RM = weight x (1 + 0.025 x effective reps)

Wathan: 1RM = 100 x weight / (48.8 + 53.8 x e^{-0.075 x effective reps})

If you choose Average, the tool blends all six estimates. A fatigue percentage then reduces the base estimate for a more conservative training number.

How to Use This Calculator

1. Enter the weight you lifted for your front squat set.
2. Add the number of reps you completed with clean technique.
3. Set your RPE so the calculator can adjust for effort.
4. Include bodyweight if you want relative strength and system weight.
5. Choose a formula or keep the average option for balance.
6. Add fatigue if you want a conservative training estimate.
7. Press the calculate button to show results above the form.
8. Download the CSV or PDF report for logging and coaching notes.

FAQs

1. Is front squat 1RM prediction accurate?

It is an estimate, not a guaranteed max. Accuracy is usually best when your set is technically solid, hard enough to rate honestly, and performed for lower rep counts.

2. Which formula should I choose?

The average option is a balanced starting point. Epley and Brzycki are common choices for practical programming. Compare outputs and stick with one method for consistent progress tracking.

3. Why does RPE change the result?

RPE estimates how many reps you had left. A set rated 8 usually means more reserve than a set rated 10, so the calculator adjusts effective reps before estimating max strength.

4. Should I use high-rep sets here?

You can, but lower-rep sets usually produce more reliable one-rep max estimates. As reps climb, technique drift and fatigue make prediction formulas less stable.

5. What does relative strength mean?

Relative strength compares your estimated front squat to your bodyweight. It helps athletes judge progress across weight classes, sports, and physique changes more fairly.

6. Why include a fatigue adjustment?

Fatigue adjustment creates a safer training number for days when recovery, sleep, or soreness are not ideal. Many lifters use it to avoid overshooting planned work.

7. Can I use pounds instead of kilograms?

Yes. The calculator supports both kilograms and pounds. It converts values internally, then displays the final answer, percentages, and plate loading in your selected unit.

8. Is this better than testing a true max?

A true max is the direct measure, but prediction is easier to recover from. This tool is useful when you want planning data without frequent maximal attempts.