5x5 Calculator: Calculate Your Working Weights

Every successful 5x5 program starts with one question: how much weight should you put on the bar? Whether you are following the original Bill Starr 5x5, StrongLifts, or Wendler's 5/3/1, each program uses specific percentages of your one-rep max (1RM) to determine your working weights. A 5x5 calculator takes the guesswork out of this process by computing your exact weights for every set, every exercise, every session.

Most lifters make one of two mistakes when starting a 5x5 program. Either they start too heavy and burn out within two weeks, or they start too light and make no meaningful progress. Both problems come from not understanding how working percentages translate into real numbers on the bar. A 225 lb squat max means something very different depending on whether you are squatting at 85% or 65% on a given day. The difference is the difference between grinding through failed reps and building steady, sustainable strength week after week.

This article explains how 5x5 weight calculations work, provides a built-in calculator you can use right now, and walks through detailed examples for every major lift. By the end, you will know exactly what weight to load on the bar for your next session, regardless of which 5x5 program you follow.

How the 5x5 Calculator Works

A 5x5 calculator uses your one-rep max (1RM) as the starting point and applies the percentage scheme of your chosen program to determine working weights. The math is straightforward:

Working Weight = 1RM x Percentage

For example, if your squat 1RM is 300 lbs and you are following the Bill Starr program at 80% for the heavy day, your working weight is 300 x 0.80 = 240 lbs. If the StrongLifts program calls for 85% on your third session, the calculator shows 300 x 0.85 = 255 lbs.

The calculator does this for every exercise in your program: squat, bench press, deadlift, overhead press, barbell row, and power clean. It also accounts for the different intensity levels in the Bill Starr program (heavy, medium, light) and the ramping percentages used in Wendler's 5/3/1.

Why You Need a Calculator

Without a calculator, you are either doing mental math in the gym (which leads to rounding errors and inconsistent training) or you are guessing (which leads to starting too heavy or too light). A proper calculator gives you exact numbers to the nearest 2.5 lb increment, so you can load the bar with confidence and focus entirely on lifting.

How to Use This Calculator

Step 1: Enter Your 1RM for Each Lift

Before you can calculate working weights, you need to know your current one-rep max for each exercise. If you have never tested your 1RM, you can estimate it from your best set of 5 reps using this formula:

Estimated 1RM = Weight x (1 + Reps / 30)

For example, if you can squat 225 lbs for 5 reps, your estimated 1RM is 225 x (1 + 5/30) = 225 x 1.167 = 262.5 lbs. Round down to 260 lbs for a conservative estimate.

If you do not have a recent 5-rep max either, use a weight you can complete for 5 sets of 5 reps with 2-3 reps in reserve, and estimate your 1RM from there. It is always better to start too light than too heavy. You can always increase your training max later.

Enter your estimated or tested 1RM for each of the following lifts:

Squat
Bench Press
Deadlift
Overhead Press (Standing Military Press)
Barbell Row
Power Clean (if following Bill Starr's program)

Step 2: Select Your Program Variant

Different 5x5 programs use different percentage schemes. The calculator supports three major variants:

Bill Starr 5x5: Uses heavy/medium/light rotation with percentages typically around 85%/75%/70% for squat, and similar proportional splits for other lifts
StrongLifts 5x5: Uses a single working weight per exercise, increasing by 5 lbs (upper body) or 10 lbs (lower body) each session
Wendler 5/3/1: Uses a four-week cycle with percentages of 65%/75%/85% in week one, increasing each week, with a 90% training max

Select the program you are following, and the calculator will generate the appropriate weights.

Step 3: View Your Working Weights

Once you enter your 1RM values and select your program, the calculator displays your working weights for each exercise across all sets and sessions. The results are rounded to the nearest 2.5 lb increment (the smallest weight change you can make with standard gym plates). Write these numbers down or save them to your phone before heading to the gym.

5x5 Weight Calculations: Detailed Examples

Here are complete worked examples for each of the five main lifts, using a hypothetical lifter with the following 1RM values:

Squat: 300 lbs
Bench Press: 225 lbs
Deadlift: 365 lbs
Overhead Press: 155 lbs
Barbell Row: 185 lbs

Example for Squat

The squat is performed every session in all 5x5 programs, making it the lift where accurate weight calculation matters most. Under the Bill Starr program, the squat uses three different intensities across the week:

Heavy Day (Workout A): 300 x 0.85 = 255 lbs for 5 sets of 5 reps
Medium Day (Workout B): 300 x 0.75 = 225 lbs for 5 sets of 5 reps
Light Day (Workout C): 300 x 0.70 = 210 lbs for 5 sets of 5 reps

Under StrongLifts 5x5, the squat starts at approximately 60% of 1RM and increases each session:

Session 1: 300 x 0.60 = 180 lbs
Session 2: 190 lbs
Session 3: 200 lbs
Session 4: 210 lbs

For the squat, StrongLifts adds 10 lbs per session, which means you reach your working weights relatively quickly. The key is to start conservatively and let the progression do its job. For more on squat technique, see our squat guide.

Example for Bench Press

The bench press is performed on the medium day in the Bill Starr program and alternates with the overhead press in StrongLifts:

Bill Starr Medium Day: 225 x 0.80 = 180 lbs for 5 sets of 5 reps
StrongLifts Session 1: 225 x 0.60 = 135 lbs, adding 5 lbs per session
Wendler Week 1: 225 x 0.90 x 0.65 = 132 lbs (using 90% training max)

The bench press tends to progress slower than the squat or deadlift because it involves smaller muscle groups. Be patient with bench press progression and do not rush to add weight. A 5 lb increase on the bench press per week is excellent progress.

Example for Deadlift

The deadlift is unique because it is typically performed for only one working set of 5 reps, not five sets. The weight calculation is therefore different:

Bill Starr Heavy Day: 365 x 0.85 = 310 lbs for 1 set of 5 reps
StrongLifts Workout B: 365 x 0.60 = 220 lbs, adding 10 lbs per session
Wendler Week 1: 365 x 0.90 x 0.65 = 213 lbs (using 90% training max)

Many lifters make the mistake of starting their deadlift too heavy. Remember that the deadlift is the most systemically fatiguing exercise in any program. Starting at 60-65% of your 1RM allows you to build technique and work capacity before the weights get truly heavy. For deadlift technique, see the deadlift guide.

Example for Overhead Press

The overhead press (also called the standing military press) is the lift where most lifters struggle the most with progression. It uses smaller muscles and a longer range of motion than the bench press:

Bill Starr Heavy Day: 155 x 0.85 = 130 lbs for 5 sets of 5 reps
Bill Starr Light Day: 155 x 0.70 = 110 lbs for 5 sets of 5 reps
StrongLifts Session 1: 155 x 0.60 = 95 lbs, adding 5 lbs per session

The overhead press is often the first lift to stall on any 5x5 program. This is normal. When you stall, repeat the weight for up to three sessions before deloading. For pressing technique, see the Bill Starr 5x5 article.

Example for Barbell Row

The barbell row is performed on the medium day in the Bill Starr program and on Workout A in StrongLifts. It builds back thickness and balances the pressing movements:

Bill Starr Medium Day: 185 x 0.80 = 150 lbs for 5 sets of 5 reps
StrongLifts Workout A: 185 x 0.60 = 115 lbs, adding 5 lbs per session
Wendler Week 1: 185 x 0.90 x 0.65 = 108 lbs (using 90% training max)

Rowing technique is critical. Do not sacrifice form to add weight. Pull the bar to your torso with control, squeeze your shoulder blades, and lower the bar under control. For detailed rowing technique, see the barbell row guide.

Different 5x5 Programs Compared

Understanding how each 5x5 program calculates weights helps you choose the right one for your goals and experience level.

Bill Starr 5x5

The Bill Starr 5x5 is the original program and remains the most complete version. It uses three intensity levels per week:

Heavy Day: 80-85% of 1RM for 5x5
Medium Day: 70-75% of 1RM for 5x5
Light Day: 65-70% of 1RM for 5x5

The rotation provides built-in periodization and recovery. The heavy day drives strength gains, the medium day maintains volume, and the light day allows active recovery. This is more sophisticated than a simple linear progression and is why the original program has stood the test of time.

When you complete all 5 sets of 5 reps on the heavy day, you increase the weight by 5 lbs for the next week. The medium and light days adjust proportionally. This means your training weights increase gradually and sustainably over months and years.

StrongLifts 5x5

StrongLifts simplified the Bill Starr model by removing the heavy/medium/light rotation and using a single linear progression. The starting percentages are lower (typically 50-60% of 1RM) and increase each session:

Squat and Deadlift: Increase by 10 lbs per session
Bench Press and Overhead Press: Increase by 5 lbs per session
Barbell Row: Increase by 5 lbs per session

This makes StrongLifts easier to understand and follow, but it also means there is no built-in recovery mechanism. When you stall, you simply repeat the weight until you pass or deload. For a detailed comparison, see StrongLifts 5x5 vs Bill Starr 5x5.

Wendler 5/3/1

Jim Wendler's 5/3/1 is technically not a 5x5 program, but it uses a similar rep scheme and is often used as a progression from 5x5. The key differences:

Training Max: Uses 90% of your true 1RM as the baseline
Four-Week Cycle: Week 1 (65%/75%/85%), Week 2 (70%/80%/90%), Week 3 (75%/85%/95%), Week 4 (deload at 40%/50%/60%)
Set and Rep Scheme: 5/5/5+, 3/3/3+, 5/3/1+ (the "+" means as many reps as possible on the last set)

Wendler 5/3/1 is better suited for intermediate to advanced lifters who have exhausted their linear progression. The slower progression rate and built-in deload make it sustainable for long-term training.

How to Progress Your 5x5 Weights

Progression is the engine of any 5x5 program. Here is how to manage it effectively:

Linear Progression (StrongLifts)

Add weight every session (5 lbs upper body, 10 lbs lower body)
If you fail, repeat the weight next session
If you fail three times, deload by 10% and rebuild
Continue this cycle until you can no longer make progress even after deloading

Weekly Progression (Bill Starr)

When you complete all 5x5 on the heavy day, add 5 lbs to the heavy day weight for next week
Recalculate medium and light day weights as percentages of the new heavy day weight
If you fail, repeat the same weights next week
If you fail three weeks in a row, deload the heavy day by 10% and rebuild

Cycle Progression (Wendler 5/3/1)

Complete the four-week cycle using the prescribed percentages
Add 5 lbs to your upper body training max and 10 lbs to your lower body training max
Begin the next four-week cycle with the new training max
Only increase if you hit all your reps on the final set of each workout

The most important principle across all programs is patience. Strength is built over months and years, not days and weeks. A 5 lb increase per week on the squat adds up to 260 lbs per year. That is transformative progress if you stay consistent.

Common Mistakes in 5x5 Programming

Even with a calculator, lifters make predictable errors that undermine their progress:

Starting Too Heavy

This is the single most common mistake. Lifters test their 1RM or use a recent heavy single and start their 5x5 at 80-90% of that number. This leaves no room for progression and guarantees early stalling. Start at 60-70% of your 1RM and let the program work. You will reach challenging weights within 4-6 weeks.

Rounding Weights to Pretty Numbers

Your calculator says 187.5 lbs but you round up to 190 because it is a cleaner number. This adds 2.5 lbs to every set, which compounds over weeks. Use the exact weight the calculator gives you, even if it means loading a 2.5 lb plate on each side. That small plate is the difference between completing your sets and missing reps.

Ignoring the Light Day

In the Bill Starr program, the light day exists for recovery. Many lifters skip it or treat it as another heavy day. This defeats the purpose of the heavy/medium/light rotation and leads to overtraining. Respect the light day. It is what allows you to train heavy on the heavy day.

Changing Programs Too Often

Switching from StrongLifts to Bill Starr to Wendler every few weeks guarantees you will never make meaningful progress on any of them. Pick a program and commit to it for at least 12-16 weeks. The calculator works for all three programs, so use it consistently with whichever program you choose.

Not Eating Enough

You cannot build strength in a caloric deficit. The 5x5 program demands adequate nutrition: at least 1 gram of protein per pound of bodyweight, sufficient calories to support recovery, and quality whole foods. For nutrition guidance, see the Bill Starr 5x5 program.

Skipping Warm-Up Sets

The calculator shows your working weights, but you still need to warm up. A typical warm-up progression for a 255 lb squat working weight would be: empty bar x 10, 95 x 5, 135 x 5, 185 x 3, 225 x 2, then begin your working sets at 255. Never jump straight to your working weight without warming up.

Changing Weights Mid-Set

If the calculator says 187.5 lbs, use 187.5 lbs for all 5 sets. Do not increase or decrease the weight between sets based on how the first set felt. Consistency within a session is just as important as consistency between sessions.

FAQ

What if I do not know my 1RM?

You do not need to test your actual 1RM to use the calculator. You can estimate it from your best set of 5 reps using the formula: Estimated 1RM = Weight x (1 + Reps / 30). For example, if your best squat is 200 lbs for 5 reps, your estimated 1RM is 200 x 1.167 = 233 lbs. Use 230 lbs as a conservative estimate in the calculator.

How often should I recalculate my working weights?

In the StrongLifts program, you add weight each session, so you technically recalculate every time. In the Bill Starr program, you recalculate at the start of each week when you increase the heavy day weight. In Wendler 5/3/1, you recalculate at the start of each four-week cycle. The calculator handles all of this automatically when you input your current numbers.

Should I use the same 1RM for all programs?

Yes, your 1RM is your 1RM regardless of which program you follow. The programs differ in what percentage of that 1RM they use as working weights. However, some lifters maintain slightly different 1RM estimates for different lifts depending on their recent performance. Use your most recent tested or estimated max for each lift.

What if the calculator gives me a weight I cannot load with standard plates?

Standard gym plates come in 45, 35, 25, 10, 5, and 2.5 lb increments (per side). The calculator rounds to the nearest 2.5 lb increment, which is the smallest change you can make with standard plates. If the calculator gives you an unusual number, round to the nearest loadable weight. For example, if it says 182.5 lbs, use 180 lbs or 185 lbs depending on what plates are available.

Is the 5x5 calculator accurate for power cleans?

The calculator works for power cleans the same way it works for any other lift. Enter your power clean 1RM and the program will calculate your working weights. However, power cleans are typically performed for 3 reps, not 5, in the Bill Starr program. The percentage calculations remain the same, but the rep scheme is different.

Can I use this calculator for dumbbell exercises?

The calculator is designed for barbell exercises, which is what 5x5 programs use. If you are substituting dumbbell exercises for barbell exercises (which is not recommended for a true 5x5 program), you would need to adjust the weights based on the equipment difference. Stick with barbells for the best results on any 5x5 program.