Leg Extension Strength Standards Calculator
Compare your Leg Extension strength with Endura's strength standards for men and women at your bodyweight. A useful benchmark for a good one-rep max is our Intermediate standard: approximately 105 lb at 190 lb for a man and 61 lb at 150 lb for a woman.
How does your best lift compare? Enter your bodyweight, the machine total resistance, and the reps you completed below. The calculator estimates your one-rep max and shows your strength level for your bodyweight. Enter the number of repetitions you completed in one set, using whole numbers. Extend both knees from the same bent-knee start to a controlled near-straight finish, then return under control. Keep your hips, thighs, and torso stable without momentum or forceful hyperextension.
The calculator compares that estimated one-rep max with the Leg Extension standards for your sex at your bodyweight. It preserves the calculator's existing equations, thresholds, and input meanings; the benchmark is a comparison target, not a working-set prescription.
What Is a Good Weight for Leg Extension?
A useful Endura benchmark for Leg Extension is the Intermediate level. At the reference bodyweights used by this model, Intermediate begins around 105 lb for a 190 lb man and 61 lb for a 150 lb woman. These are estimated one-rep-max comparison targets, not universal starting weights or measured population averages.
Enter the machine total resistance. Keep the same convention when comparing sets. Enter the number of repetitions you completed in one set, using whole numbers. Extend both knees from the same bent-knee start to a controlled near-straight finish, then return under control. Keep your hips, thighs, and torso stable without momentum or forceful hyperextension. Enter your bodyweight, exact exercise weight, and valid reps to see how your set compares with the bodyweight-adjusted standards and the next target.
Your Leg Extension result compares your estimated one-rep max with strength targets adjusted for your sex and exact bodyweight. The result is still specific to Leg Extension; it should not be treated as a rating for a nearby exercise.
A heavier lifter receives higher target loads, but those targets do not rise pound-for-pound with bodyweight. This is why the calculator uses your exact bodyweight instead of assigning every lifter’s tier from one fixed bodyweight ratio.
Leg Extension Strength Standards
Use the men’s or women’s table and find the row closest to your bodyweight for a quick reference. For an exact result, enter your bodyweight, weight lifted, and reps into the calculator. It will estimate your one-rep max, identify your strength level, and show the next target to pursue.
Enter the selected or added machine weight moved by both legs together. Keep your hips and thighs stable on the seat, extend both knees from the same controlled bent-knee start to a repeatable near-straight finish, and return without kicking or pad bounce. Use the same machine, seat and pad settings for repeat tests; machine readings do not represent identical resistance across different designs.
Endura built these standards from reviewed Leg Extension targets and adjusts them for different bodyweights. They are practical benchmarks for this exact test—not population averages or standards for Seated Leg Curl.
Men’s Leg Extension Strength Standards
| Bodyweight | Beginner | Novice | Intermediate | Advanced | Elite | Stretch |
|---|---|---|---|---|---|---|
| 120 lb | Under 49 lb | 49–76 lb | 77–109 lb | 110–142 lb | 143–170 lb | 171 lb+ |
| 130 lb | Under 52 lb | 52–81 lb | 82–115 lb | 116–150 lb | 151–179 lb | 180 lb+ |
| 140 lb | Under 55 lb | 55–85 lb | 86–121 lb | 122–157 lb | 158–188 lb | 189 lb+ |
| 150 lb | Under 57 lb | 57–89 lb | 90–126 lb | 127–165 lb | 166–197 lb | 198 lb+ |
| 160 lb | Under 60 lb | 60–93 lb | 94–132 lb | 133–172 lb | 173–206 lb | 207 lb+ |
| 170 lb | Under 62 lb | 62–96 lb | 97–137 lb | 138–179 lb | 180–214 lb | 215 lb+ |
| 180 lb | Under 65 lb | 65–100 lb | 101–143 lb | 144–186 lb | 187–223 lb | 224 lb+ |
| 190 lb | Under 67 lb | 67–104 lb | 105–148 lb | 149–193 lb | 194–231 lb | 232 lb+ |
| 200 lb | Under 69 lb | 69–108 lb | 109–153 lb | 154–200 lb | 201–239 lb | 240 lb+ |
| 210 lb | Under 72 lb | 72–111 lb | 112–158 lb | 159–206 lb | 207–247 lb | 248 lb+ |
| 220 lb | Under 74 lb | 74–115 lb | 116–163 lb | 164–213 lb | 214–255 lb | 256 lb+ |
| 230 lb | Under 76 lb | 76–118 lb | 119–168 lb | 169–219 lb | 220–263 lb | 264 lb+ |
| 240 lb | Under 78 lb | 78–122 lb | 123–173 lb | 174–226 lb | 227–270 lb | 271 lb+ |
| 250 lb | Under 80 lb | 80–125 lb | 126–178 lb | 179–232 lb | 233–278 lb | 279 lb+ |
| 260 lb | Under 83 lb | 83–128 lb | 129–183 lb | 184–238 lb | 239–285 lb | 286 lb+ |
Women’s Leg Extension Strength Standards
| Bodyweight | Beginner | Novice | Intermediate | Advanced | Elite | Stretch |
|---|---|---|---|---|---|---|
| 100 lb | Under 29 lb | 29–46 lb | 47–68 lb | 69–89 lb | 90–107 lb | 108 lb+ |
| 110 lb | Under 31 lb | 31–49 lb | 50–73 lb | 74–95 lb | 96–114 lb | 115 lb+ |
| 120 lb | Under 33 lb | 33–52 lb | 53–77 lb | 78–101 lb | 102–121 lb | 122 lb+ |
| 130 lb | Under 35 lb | 35–54 lb | 55–82 lb | 83–106 lb | 107–127 lb | 128 lb+ |
| 140 lb | Under 36 lb | 36–57 lb | 58–86 lb | 87–112 lb | 113–134 lb | 135 lb+ |
| 150 lb | Under 38 lb | 38–60 lb | 61–90 lb | 91–117 lb | 118–140 lb | 141 lb+ |
| 160 lb | Under 40 lb | 40–63 lb | 64–94 lb | 95–122 lb | 123–146 lb | 147 lb+ |
| 170 lb | Under 41 lb | 41–65 lb | 66–98 lb | 99–127 lb | 128–152 lb | 153 lb+ |
| 180 lb | Under 43 lb | 43–68 lb | 69–102 lb | 103–132 lb | 133–158 lb | 159 lb+ |
| 190 lb | Under 44 lb | 44–70 lb | 71–106 lb | 107–137 lb | 138–164 lb | 165 lb+ |
| 200 lb | Under 46 lb | 46–73 lb | 74–109 lb | 110–142 lb | 143–170 lb | 171 lb+ |
| 210 lb | Under 48 lb | 48–75 lb | 76–113 lb | 114–147 lb | 148–175 lb | 176 lb+ |
| 220 lb | Under 49 lb | 49–78 lb | 79–116 lb | 117–151 lb | 152–181 lb | 182 lb+ |
These are Endura’s practical Leg Extension standards. They are built from exercise-specific reference thresholds and validated against the calculator’s exact lower-inclusive tier boundaries; they are not population averages.
How the Leg Extension Calculator Works
Enter your sex, bodyweight, weight lifted, and reps. The calculator estimates your one-rep max from the set, then compares that estimate with the Leg Extension targets for your exact bodyweight. A one-rep entry uses the entered weight directly.
The bodyweight adjustment starts with reviewed targets for a 190 lb man and a 150 lb woman. For example, the men’s Advanced target is 127 lb at 150 lb bodyweight, 149 lb at 190 lb, and 169 lb at 230 lb. That is why the calculator needs your exact bodyweight instead of using one fixed bodyweight ratio for everyone.
Elite Leg Extension Strength Levels
Elite Leg Extension strength means reaching the Elite target for your sex and exact bodyweight while following the calculator’s accepted testing rules. The target increases as bodyweight increases, but not pound-for-pound, so use the calculator for your exact Elite and Stretch targets.
| Sex | Bodyweight | Elite begins | Stretch begins |
|---|---|---|---|
| Men | 150 lb | 166 lb | 198 lb |
| Men | 190 lb | 194 lb | 232 lb |
| Men | 230 lb | 220 lb | 264 lb |
| Women | 120 lb | 102 lb | 122 lb |
| Women | 150 lb | 118 lb | 141 lb |
| Women | 180 lb | 133 lb | 159 lb |
Leg Extension Strength Compared to Other Lifts
Use these comparisons to see how your Leg Extension strength carries over when the implement, starting position, or finish changes. Test each movement under its own rules so every result reflects the exercise you actually performed.
Compare the strength levels each calculator gives you instead of assuming the same weight means the same thing in different exercises. A meaningful gap can point you toward the part of the movement worth working on next.
| Compare with | What the comparison can show | How the test differs |
|---|---|---|
| Seated Leg Curl | Compare seated knee flexion with your seated knee extension. | The seated curl bends the knees and uses its own machine and repetition rules. |
| Lying Leg Curl | Compare knee flexion in a lying position with seated knee extension. | The lying curl uses a different support position and the opposite knee action. |
| Leg Press (45° Sled) | Compare isolated knee extension with a two-leg machine press. | The leg press uses a sled and involves both hip and knee motion. |
| Machine Hack Squat | Compare knee extension with a guided squat. | The hack squat supports your upper body and follows its own squat depth rules. |
| Safety Bar Squat | Compare machine knee extension with a free-weight squat. | The safety bar squat uses a different implement, support position and full-body movement. |
Milestones in Leg Extension Strength
Your next Leg Extension milestone is the next strength level above your current result. Enter your sex, bodyweight, selected or added machine weight for both legs together, and controlled two-leg extension repetitions to see exactly how much estimated one-rep-max strength separates you from that level.
Use that gap as a concrete training target. Because your score is based on estimated one-rep-max strength, you can close it by extending a higher selected machine weight through the same range on the same machine, completing another controlled repetition with the same seat and pad setup, or improving both. Recalculate after a strong set to see whether you reached the next level and, if not, exactly how much remains.
| Group | Reference bodyweight | Novice to Intermediate | Intermediate to Advanced | Advanced to Elite | Elite to Stretch |
|---|---|---|---|---|---|
| Men | 190 lb | +38 lb | +44 lb | +45 lb | +38 lb |
| Women | 150 lb | +23 lb | +30 lb | +27 lb | +23 lb |
Related Strength Standards Tools
Use these related calculators for context, not as substitutes for the Leg Extension result. Each movement has its own execution rules and strength standards.
- Seated Leg Curl — Compare seated knee flexion with your seated knee extension.
- Lying Leg Curl — Compare knee flexion in a lying position with seated knee extension.
- Leg Press (45° Sled) — Compare isolated knee extension with a two-leg machine press.
- Machine Hack Squat — Compare knee extension with a guided squat.
- Safety Bar Squat — Compare machine knee extension with a free-weight squat.
| Compare with | What the comparison can show | How the test differs |
|---|---|---|
| Seated Leg Curl | Compare seated knee flexion with your seated knee extension. | The seated curl bends the knees and uses its own machine and repetition rules. |
| Lying Leg Curl | Compare knee flexion in a lying position with seated knee extension. | The lying curl uses a different support position and the opposite knee action. |
| Leg Press (45° Sled) | Compare isolated knee extension with a two-leg machine press. | The leg press uses a sled and involves both hip and knee motion. |
| Machine Hack Squat | Compare knee extension with a guided squat. | The hack squat supports your upper body and follows its own squat depth rules. |
| Safety Bar Squat | Compare machine knee extension with a free-weight squat. | The safety bar squat uses a different implement, support position and full-body movement. |