Enter a quality working set
Select a recent working set performed with solid technique and RPE (effort level). Skip warm-ups or sets where form broke down for the most accurate baseline.
Free Training Tools
Free 1RM & Plate Calculators
Estimate your one-rep max, explore useful training percentages, and find several ways to load a barbell in pounds or kilograms.
Units across all calculators
01Step 1: Benchmark Your Strength
One-Rep Max (1RM) Calculator
Estimate the heaviest weight you could lift for one rep from a recent, technically sound set. The selected exercise is saved in the display; every weighted exercise uses the same Epley formula.
Estimated 1RM = weight × (1 + reps ÷ 30)
Estimated 1RM · Barbell bench press
216lbBased on 185 lb for 5 reps100%216 lb
95%205 lb
90%194.5 lb
85%183.5 lb
80%172.5 lb
75%162 lb
70%151 lb
Estimated, not a tested maximum. Performance varies with technique, fatigue, equipment, and exercise familiarity. Do not attempt a true maximal lift without an experienced spotter, safe setup, and appropriate training experience.
How Your Estimate Is Calculated
How the 1RM Calculator Works
Your one-rep max, or 1RM, is the most weight you could lift once with good technique. Testing it directly can be demanding, so this calculator estimates it from a recent set you have already completed.
We apply the Epley formula
The estimate is weight × (1 + reps ÷ 30). For example, 185 lb for five reps produces an estimated 1RM of about 216 lb.
Use the percentages to plan
The percentage table translates the estimate into practical reference loads. A trainer can adjust those numbers for your goal, experience, fatigue, and technique.
Estimates from lower-rep sets are generally more useful. Results from sets above 10 reps are less precise, and an estimated 1RM is not a reason to attempt a maximum lift without an experienced spotter and safe setup.
Once you have a target weight, use the barbell plate calculator to see balanced loading options for each side of the bar.
02Step 2: Load Your Barbell
Barbell Plate Calculator
Enter the total weight you want on the bar. The result shows a few different ways to reach it using standard lb plate sizes.
Loading options
Option 1
On each side
1 × 45lb1 × 5lb
Option 2
On each side
2 × 25lb
Option 3
On each side
1 × 35lb1 × 10lb1 × 5lb
Loaded total: 145 lb · exact match
Confirm the bar and plate markings at your gym, load both sides evenly, and use collars where appropriate.
How Your Plates Are Calculated
How to Calculate Weight Plates on a Barbell
The target weight includes the bar. Subtract the bar weight from your target, then divide the remainder by two because each side must be loaded evenly.
Plates per side = (target weight − bar weight) ÷ 2
For a 145 lb target with a 45 lb bar, each side needs 50 lb. You could use one 45 lb plate plus one 5 lb plate per side, or choose another combination shown by the calculator when the available plate sizes allow it.
Data gives you a starting point. A trainer helps you build the path.
An estimated 1RM provides a solid baseline for choosing working weights, tracking progress, and knowing when to refine your form before adding load.
Don't just send your trainer the final number, share the exercise, weight, reps, and RPE (how the set felt). That full picture allows them to tailor a safer, more effective program to your actual capabilities.
Common Questions