# Bench Press Calculator

Calculate your bench press one-rep max using Epley and Brzycki formulas. Enter your weight and reps to get 1RM estimates and training percentages.

## What this calculates

Knowing your bench press one-rep max helps you program smarter without the injury risk of actually maxing out. Enter the weight you lifted and how many reps you completed, and this calculator will estimate your 1RM using two proven formulas.

## Inputs

- **Weight Lifted** (kg) — min 1, max 500
- **Repetitions** — min 1, max 30 — Number of reps completed with good form (1-30)

## Outputs

- **Epley 1RM Estimate** — One-rep max using the Epley formula
- **Brzycki 1RM Estimate** — One-rep max using the Brzycki formula
- **Average 1RM** — Average of both formula estimates
- **Training Percentages** — formatted as text — Key percentages of your estimated 1RM for programming

## Details

This calculator uses two of the most respected strength prediction formulas. The Epley formula (1RM = weight x (1 + reps/30)) was developed from regression analysis of powerlifting data and works well across rep ranges. The Brzycki formula (1RM = weight x 36/(37 - reps)) tends to give slightly more conservative estimates, especially at higher rep ranges.

For example, if you bench 185 lbs for 5 reps, the Epley formula estimates your 1RM at about 216 lbs, while Brzycki puts it around 208 lbs. The average of 212 lbs gives you a practical working max for programming.

Both formulas are most accurate with sets of 1-10 reps. Beyond 10 reps, the estimates become less reliable because muscular endurance starts playing a bigger role than raw strength. For the best results, use a challenging weight you can lift for 3-5 reps with good form.

The training percentages help you set up your workouts. A typical bench press program might use 85-95% for heavy singles and triples, 75-85% for strength sets of 3-5, and 65-75% for hypertrophy sets of 8-12.

## Frequently Asked Questions

**Q: Which formula is more accurate for bench press?**

A: Both the Epley and Brzycki formulas produce similar results for sets of 1-10 reps. Epley tends to estimate slightly higher, while Brzycki is a bit more conservative. For bench press specifically, the average of both formulas is your best bet. The real accuracy depends on using a set of 3-5 reps where technique does not break down.

**Q: How many reps should I use for the best estimate?**

A: Use a set of 3-5 reps with a challenging weight for the most accurate estimate. Sets of 1-2 reps give the most precise result (since you are closer to your actual max), but sets of 3-5 reps are safer and still produce estimates within about 5% of your true 1RM. Anything above 10 reps gets progressively less accurate.

**Q: Should I actually attempt a bench press max?**

A: For most lifters, estimating your 1RM from submaximal sets is safer than actually maxing out. The bench press puts your shoulders in a vulnerable position under heavy loads. If you do test a true 1RM, always use a spotter, set up safety pins or arms in a power rack, and warm up thoroughly with progressive sets.

**Q: How often should I retest my bench press max?**

A: Recalculate your estimated 1RM every 4-8 weeks as your strength progresses. If you are consistently hitting more reps than expected at your training weights, your 1RM has likely increased. There is no need to retest weekly since strength changes gradually over training cycles.

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Source: https://vastcalc.com/calculators/health/bench-press
Category: Health & Fitness
Last updated: 2026-04-08