Belt Squat vs Leg Extension Strength Standards
Compare your belt squat and leg extension against strength standards for your sex and bodyweight. Enter one recent set of 1–12 reps for each lift to see your estimated one-rep maxes, strength levels, next targets, and which lift you should prioritize.
Enter the tested belt-squat machine's external resistance and the leg-extension machine's selected or added resistance for both legs together. Use a strict, repeatable belt squat set that follows the canonical setup, range, and lockout rules and a strict, repeatable leg extension set that follows the canonical setup, range, and lockout rules. You can enter either lift in pounds or kilograms. Each lift is compared with its own standards, so the heavier lift is not automatically the stronger one.
Belt Squat vs Leg Extension Strength Standards by Bodyweight
Use these tables to compare the estimated one-rep max required for the belt squat and leg extension to reach the same strength level at each listed bodyweight. They show the targets used by the calculator—not a required difference between your belt squat and leg extension.
Choose the men’s or women’s table, find your bodyweight or the closest listed row, then read across to Novice, Intermediate, Advanced, or Elite. Every entry shows Belt Squat / Leg Extension, with pounds first and kilograms underneath. For a result based on your exact bodyweight and recent sets, use the calculator above; you do not need to test either true one-rep max.
Men’s Belt Squat vs Leg Extension Standards
How to read the table: The first number is Belt Squat; the second is Leg Extension. Each number is the lowest estimated one-rep max needed to reach that strength level. Scroll horizontally on smaller screens.
| Bodyweight | Novice | Intermediate | Advanced | Elite |
|---|---|---|---|---|
| 120 lb 54.4 kg | 175 / 49 lb 79.4 / 22.2 kg | 221 / 77 lb 100.2 / 34.9 kg | 269 / 109 lb 122 / 49.4 kg | 316 / 143 lb 143.3 / 64.9 kg |
| 130 lb 59 kg | 185 / 52 lb 83.9 / 23.6 kg | 233 / 82 lb 105.7 / 37.2 kg | 283 / 115 lb 128.4 / 52.2 kg | 333 / 151 lb 151 / 68.5 kg |
| 140 lb 63.5 kg | 194 / 55 lb 88 / 24.9 kg | 245 / 86 lb 111.1 / 39 kg | 298 / 121 lb 135.2 / 54.9 kg | 350 / 158 lb 158.8 / 71.7 kg |
| 150 lb 68 kg | 203 / 57 lb 92.1 / 25.9 kg | 256 / 90 lb 116.1 / 40.8 kg | 312 / 126 lb 141.5 / 57.2 kg | 366 / 166 lb 166 / 75.3 kg |
| 160 lb 72.6 kg | 212 / 60 lb 96.2 / 27.2 kg | 268 / 94 lb 121.6 / 42.6 kg | 325 / 132 lb 147.4 / 59.9 kg | 383 / 173 lb 173.7 / 78.5 kg |
| 170 lb 77.1 kg | 221 / 62 lb 100.2 / 28.1 kg | 279 / 97 lb 126.6 / 44 kg | 339 / 137 lb 153.8 / 62.1 kg | 398 / 180 lb 180.5 / 81.6 kg |
| 180 lb 81.6 kg | 230 / 65 lb 104.3 / 29.5 kg | 289 / 101 lb 131.1 / 45.8 kg | 352 / 143 lb 159.7 / 64.9 kg | 414 / 187 lb 187.8 / 84.8 kg |
| 190 lb 86.2 kg | 238 / 67 lb 108 / 30.4 kg | 300 / 105 lb 136.1 / 47.6 kg | 365 / 148 lb 165.6 / 67.1 kg | 429 / 194 lb 194.6 / 88 kg |
| 200 lb 90.7 kg | 246 / 69 lb 111.6 / 31.3 kg | 310 / 109 lb 140.6 / 49.4 kg | 378 / 153 lb 171.5 / 69.4 kg | 444 / 201 lb 201.4 / 91.2 kg |
| 210 lb 95.3 kg | 254 / 72 lb 115.2 / 32.7 kg | 321 / 112 lb 145.6 / 50.8 kg | 390 / 158 lb 176.9 / 71.7 kg | 459 / 207 lb 208.2 / 93.9 kg |
| 220 lb 99.8 kg | 262 / 74 lb 118.8 / 33.6 kg | 331 / 116 lb 150.1 / 52.6 kg | 402 / 163 lb 182.3 / 73.9 kg | 473 / 214 lb 214.5 / 97.1 kg |
| 230 lb 104.3 kg | 270 / 76 lb 122.5 / 34.5 kg | 341 / 119 lb 154.7 / 54 kg | 415 / 168 lb 188.2 / 76.2 kg | 487 / 220 lb 220.9 / 99.8 kg |
| 240 lb 108.9 kg | 278 / 78 lb 126.1 / 35.4 kg | 351 / 123 lb 159.2 / 55.8 kg | 427 / 173 lb 193.7 / 78.5 kg | 501 / 227 lb 227.2 / 103 kg |
| 250 lb 113.4 kg | 286 / 80 lb 129.7 / 36.3 kg | 360 / 126 lb 163.3 / 57.2 kg | 438 / 178 lb 198.7 / 80.7 kg | 515 / 233 lb 233.6 / 105.7 kg |
| 260 lb 117.9 kg | 293 / 83 lb 132.9 / 37.6 kg | 370 / 129 lb 167.8 / 58.5 kg | 450 / 182 lb 204.1 / 82.6 kg | 529 / 239 lb 240 / 108.4 kg |
| 270 lb 122.5 kg | 301 / 85 lb 136.5 / 38.6 kg | 379 / 133 lb 171.9 / 60.3 kg | 461 / 187 lb 209.1 / 84.8 kg | 542 / 245 lb 245.8 / 111.1 kg |
| 280 lb 127 kg | 308 / 87 lb 139.7 / 39.5 kg | 388 / 136 lb 176 / 61.7 kg | 473 / 192 lb 214.5 / 87.1 kg | 556 / 251 lb 252.2 / 113.9 kg |
| 290 lb 131.5 kg | 316 / 89 lb 143.3 / 40.4 kg | 398 / 139 lb 180.5 / 63 kg | 484 / 196 lb 219.5 / 88.9 kg | 569 / 257 lb 258.1 / 116.6 kg |
| 300 lb 136.1 kg | 323 / 91 lb 146.5 / 41.3 kg | 407 / 142 lb 184.6 / 64.4 kg | 495 / 201 lb 224.5 / 91.2 kg | 582 / 263 lb 264 / 119.3 kg |
Women’s Belt Squat vs Leg Extension Standards
How to read the table: The first number is Belt Squat; the second is Leg Extension. Each number is the lowest estimated one-rep max needed to reach that strength level. Scroll horizontally on smaller screens.
| Bodyweight | Novice | Intermediate | Advanced | Elite |
|---|---|---|---|---|
| 100 lb 45.4 kg | 109 / 29 lb 49.4 / 13.2 kg | 137 / 46 lb 62.1 / 20.9 kg | 172 / 69 lb 78 / 31.3 kg | 206 / 89 lb 93.4 / 40.4 kg |
| 110 lb 49.9 kg | 116 / 31 lb 52.6 / 14.1 kg | 146 / 49 lb 66.2 / 22.2 kg | 183 / 73 lb 83 / 33.1 kg | 220 / 95 lb 99.8 / 43.1 kg |
| 120 lb 54.4 kg | 123 / 33 lb 55.8 / 15 kg | 155 / 52 lb 70.3 / 23.6 kg | 194 / 78 lb 88 / 35.4 kg | 233 / 101 lb 105.7 / 45.8 kg |
| 130 lb 59 kg | 130 / 35 lb 59 / 15.9 kg | 164 / 55 lb 74.4 / 24.9 kg | 205 / 82 lb 93 / 37.2 kg | 245 / 106 lb 111.1 / 48.1 kg |
| 140 lb 63.5 kg | 137 / 36 lb 62.1 / 16.3 kg | 172 / 57 lb 78 / 25.9 kg | 215 / 86 lb 97.5 / 39 kg | 258 / 112 lb 117 / 50.8 kg |
| 150 lb 68 kg | 143 / 38 lb 64.9 / 17.2 kg | 180 / 60 lb 81.6 / 27.2 kg | 225 / 90 lb 102.1 / 40.8 kg | 270 / 117 lb 122.5 / 53.1 kg |
| 160 lb 72.6 kg | 149 / 40 lb 67.6 / 18.1 kg | 188 / 63 lb 85.3 / 28.6 kg | 235 / 94 lb 106.6 / 42.6 kg | 282 / 122 lb 127.9 / 55.3 kg |
| 170 lb 77.1 kg | 155 / 41 lb 70.3 / 18.6 kg | 196 / 65 lb 88.9 / 29.5 kg | 245 / 98 lb 111.1 / 44.5 kg | 293 / 127 lb 132.9 / 57.6 kg |
| 180 lb 81.6 kg | 161 / 43 lb 73 / 19.5 kg | 203 / 68 lb 92.1 / 30.8 kg | 254 / 102 lb 115.2 / 46.3 kg | 305 / 132 lb 138.3 / 59.9 kg |
| 190 lb 86.2 kg | 167 / 44 lb 75.7 / 20 kg | 211 / 70 lb 95.7 / 31.8 kg | 263 / 105 lb 119.3 / 47.6 kg | 316 / 137 lb 143.3 / 62.1 kg |
| 200 lb 90.7 kg | 173 / 46 lb 78.5 / 20.9 kg | 218 / 73 lb 98.9 / 33.1 kg | 273 / 109 lb 123.8 / 49.4 kg | 327 / 142 lb 148.3 / 64.4 kg |
| 210 lb 95.3 kg | 179 / 48 lb 81.2 / 21.8 kg | 225 / 75 lb 102.1 / 34 kg | 282 / 113 lb 127.9 / 51.3 kg | 338 / 146 lb 153.3 / 66.2 kg |
| 220 lb 99.8 kg | 185 / 49 lb 83.9 / 22.2 kg | 232 / 77 lb 105.2 / 34.9 kg | 290 / 116 lb 131.5 / 52.6 kg | 349 / 151 lb 158.3 / 68.5 kg |
| 230 lb 104.3 kg | 190 / 51 lb 86.2 / 23.1 kg | 239 / 80 lb 108.4 / 36.3 kg | 299 / 120 lb 135.6 / 54.4 kg | 359 / 156 lb 162.8 / 70.8 kg |
| 240 lb 108.9 kg | 196 / 52 lb 88.9 / 23.6 kg | 246 / 82 lb 111.6 / 37.2 kg | 308 / 123 lb 139.7 / 55.8 kg | 369 / 160 lb 167.4 / 72.6 kg |
How Your Belt Squat vs Leg Extension Result Is Calculated
The calculator estimates each max, rates it against the standards for that exercise and bodyweight, then compares the two ratings. Here is the complete process.
1. Estimate a one-rep max from each set
For one rep, it uses the weight entered. For 2–12 reps, it runs both formulas and keeps the lower, less aggressive estimate.
- Epley: weight × (1 + reps ÷ 30)
- Brzycki: weight × 36 ÷ (37 − reps)
A published back-squat study supports estimated-max prediction under its study conditions. It does not independently validate every exercise or population used by this comparison. Estimates are more dependable from clean, difficult, lower-rep sets. See the Back-squat formula validation study and Published discussion of back-squat one-rep-max prediction research.
2. Find the belt squat strength level
The standards use the sex-specific targets from the individual Belt Squat tool. Targets begin at 190 lb for men and 150 lb for women, then adjust to your exact bodyweight: reference target × (user bodyweight ÷ reference bodyweight) to the two-thirds power.
The target rises more slowly than bodyweight so heavier lifters are expected to lift more without requiring strength to increase pound for pound.
3. Find the leg extension strength level
The standards use the sex-specific targets from the individual Leg Extension tool. Targets begin at 190 lb for men and 150 lb for women, then adjust to your exact bodyweight: reference target × (user bodyweight ÷ reference bodyweight) to the two-thirds power.
The target rises more slowly than bodyweight so heavier lifters are expected to lift more without requiring strength to increase pound for pound.
4. Compare the two results
Each max receives a level from Beginner through Elite. The lower-level lift is the priority. If the levels match, a priority appears only when one lift is at least 10 points farther from its next level. Otherwise, the result is Balanced.
The result shows which lift ranks lower, not why. Technique, fatigue, training history, and set quality can affect it. Age range is recorded anonymously but does not change the standards.
| Stage | What happens |
|---|---|
| Estimate each max | Use the entered weight for 1 rep; for 2–12 reps, keep the lower formula result. |
| Rate the belt squat | Adjust belt squat targets to exact bodyweight with the two-thirds rule. |
| Rate the leg extension | Adjust leg extension targets to exact bodyweight with the two-thirds rule. |
| Compare different levels | Name the lower-level lift as the priority. |
| Compare matching levels | Use Balanced unless the difference in progress toward the next level reaches 10 points. |
Use the calculator above to see both estimated maxes, strength levels, the priority or Balanced result, and both next-level targets.
How Men’s Belt Squat and Leg Extension Standards Differ
How to read both charts: Choose a strength level, find bodyweight along the bottom, and follow that level’s line. Zero means the two standards are equal. Above zero means the leg extension standard is higher; below zero means the belt squat standard is higher. On a phone, swipe the chart left and right to inspect the full-size lines and labels. The tables provide the exact pounds and kilograms.
What the men’s data shows:
The standards come closest at 120 lb.
Novice, Intermediate, Advanced, and Elite at every displayed bodyweight.
78.4 → 144.7 kg from 120 to 300 lb bodyweight.
How to read the table: Every number is the leg extension standard minus the belt squat standard. A plus sign means the leg extension standard is higher. A minus sign means the belt squat standard is higher.
| Bodyweight | Novice | Intermediate | Advanced | Elite |
|---|---|---|---|---|
| 120 lb 54.4 kg | −126 lb −57.2 kg | −144 lb −65.3 kg | −160 lb −72.6 kg | −173 lb −78.4 kg |
| 130 lb 59 kg | −133 lb −60.3 kg | −151 lb −68.5 kg | −168 lb −76.2 kg | −182 lb −82.5 kg |
| 140 lb 63.5 kg | −139 lb −63.1 kg | −159 lb −72.1 kg | −177 lb −80.3 kg | −192 lb −87.1 kg |
| 150 lb 68 kg | −146 lb −66.2 kg | −166 lb −75.3 kg | −186 lb −84.3 kg | −200 lb −90.7 kg |
| 160 lb 72.6 kg | −152 lb −69 kg | −174 lb −79 kg | −193 lb −87.5 kg | −210 lb −95.2 kg |
| 170 lb 77.1 kg | −159 lb −72.1 kg | −182 lb −82.6 kg | −202 lb −91.7 kg | −218 lb −98.9 kg |
| 180 lb 81.6 kg | −165 lb −74.8 kg | −188 lb −85.3 kg | −209 lb −94.8 kg | −227 lb −103 kg |
| 190 lb 86.2 kg | −171 lb −77.6 kg | −195 lb −88.5 kg | −217 lb −98.5 kg | −235 lb −106.6 kg |
| 200 lb 90.7 kg | −177 lb −80.3 kg | −201 lb −91.2 kg | −225 lb −102.1 kg | −243 lb −110.2 kg |
| 210 lb 95.3 kg | −182 lb −82.5 kg | −209 lb −94.8 kg | −232 lb −105.2 kg | −252 lb −114.3 kg |
| 220 lb 99.8 kg | −188 lb −85.2 kg | −215 lb −97.5 kg | −239 lb −108.4 kg | −259 lb −117.4 kg |
| 230 lb 104.3 kg | −194 lb −88 kg | −222 lb −100.7 kg | −247 lb −112 kg | −267 lb −121.1 kg |
| 240 lb 108.9 kg | −200 lb −90.7 kg | −228 lb −103.4 kg | −254 lb −115.2 kg | −274 lb −124.2 kg |
| 250 lb 113.4 kg | −206 lb −93.4 kg | −234 lb −106.1 kg | −260 lb −118 kg | −282 lb −127.9 kg |
| 260 lb 117.9 kg | −210 lb −95.3 kg | −241 lb −109.3 kg | −268 lb −121.5 kg | −290 lb −131.6 kg |
| 270 lb 122.5 kg | −216 lb −97.9 kg | −246 lb −111.6 kg | −274 lb −124.3 kg | −297 lb −134.7 kg |
| 280 lb 127 kg | −221 lb −100.2 kg | −252 lb −114.3 kg | −281 lb −127.4 kg | −305 lb −138.3 kg |
| 290 lb 131.5 kg | −227 lb −102.9 kg | −259 lb −117.5 kg | −288 lb −130.6 kg | −312 lb −141.5 kg |
| 300 lb 136.1 kg | −232 lb −105.2 kg | −265 lb −120.2 kg | −294 lb −133.3 kg | −319 lb −144.7 kg |
How Women’s Belt Squat and Leg Extension Standards Differ
What the women’s data shows:
The standards come closest at 100 lb.
Novice, Intermediate, Advanced, and Elite at every displayed bodyweight.
53 → 94.8 kg from 100 to 240 lb bodyweight.
How to read the table: Every number is the leg extension standard minus the belt squat standard. A plus sign means the leg extension standard is higher. A minus sign means the belt squat standard is higher.
| Bodyweight | Novice | Intermediate | Advanced | Elite |
|---|---|---|---|---|
| 100 lb 45.4 kg | −80 lb −36.2 kg | −91 lb −41.2 kg | −103 lb −46.7 kg | −117 lb −53 kg |
| 110 lb 49.9 kg | −85 lb −38.5 kg | −97 lb −44 kg | −110 lb −49.9 kg | −125 lb −56.7 kg |
| 120 lb 54.4 kg | −90 lb −40.8 kg | −103 lb −46.7 kg | −116 lb −52.6 kg | −132 lb −59.9 kg |
| 130 lb 59 kg | −95 lb −43.1 kg | −109 lb −49.5 kg | −123 lb −55.8 kg | −139 lb −63 kg |
| 140 lb 63.5 kg | −101 lb −45.8 kg | −115 lb −52.1 kg | −129 lb −58.5 kg | −146 lb −66.2 kg |
| 150 lb 68 kg | −105 lb −47.7 kg | −120 lb −54.4 kg | −135 lb −61.3 kg | −153 lb −69.4 kg |
| 160 lb 72.6 kg | −109 lb −49.5 kg | −125 lb −56.7 kg | −141 lb −64 kg | −160 lb −72.6 kg |
| 170 lb 77.1 kg | −114 lb −51.7 kg | −131 lb −59.4 kg | −147 lb −66.6 kg | −166 lb −75.3 kg |
| 180 lb 81.6 kg | −118 lb −53.5 kg | −135 lb −61.3 kg | −152 lb −68.9 kg | −173 lb −78.4 kg |
| 190 lb 86.2 kg | −123 lb −55.7 kg | −141 lb −63.9 kg | −158 lb −71.7 kg | −179 lb −81.2 kg |
| 200 lb 90.7 kg | −127 lb −57.6 kg | −145 lb −65.8 kg | −164 lb −74.4 kg | −185 lb −83.9 kg |
| 210 lb 95.3 kg | −131 lb −59.4 kg | −150 lb −68.1 kg | −169 lb −76.6 kg | −192 lb −87.1 kg |
| 220 lb 99.8 kg | −136 lb −61.7 kg | −155 lb −70.3 kg | −174 lb −78.9 kg | −198 lb −89.8 kg |
| 230 lb 104.3 kg | −139 lb −63.1 kg | −159 lb −72.1 kg | −179 lb −81.2 kg | −203 lb −92 kg |
| 240 lb 108.9 kg | −144 lb −65.3 kg | −164 lb −74.4 kg | −185 lb −83.9 kg | −209 lb −94.8 kg |
Belt Squat and Leg Extension Exercises Used by This Calculator
This calculator uses a strict belt squat and a strict leg extension. Use a strict bilateral belt squat and a strict two-leg machine leg extension under each tool’s machine, load, setup, range, and finish rules. Do not substitute barbell squats, hack squats, leg presses, single-leg extensions, hip-lifted reps, rail-assisted reps, bounced reps, pad-kicked reps, shortened reps, or assisted reps.
Use a strict, repeatable Belt Squat
Use the tested Belt Squat machine only Enter external resistance for the set Use matching units for bodyweight and resistance Keep setup and range consistent Count only strict controlled reps Do not enter a different exercise result Enter displayed machine or stack weight. Keep the same equipment and setup when retesting.
Use a strict, repeatable Leg Extension
the selected or added machine resistance for both legs together strict two-leg machine leg extension reps extend both knees from the same controlled seated start to a repeatable near-straight finish, then return without kicking, hip lift, pad bounce, seat slide, or shortened range Consistent setup, range, and finish quality across the entered set No substituted exercise or assisted reps Enter displayed machine or stack weight. Keep the same equipment and setup when retesting.
Enter one recent Belt Squat set and one recent Leg Extension set
Enter each tested machine’s selected, added, or displayed resistance and strict bilateral reps. Keep each machine and setup consistent. Use whole numbers from 1 to 12; pounds and kilograms can be mixed.
Related Tools
- Belt Squat — View the individual Belt Squat standards and next strength-level target.
- Leg Extension — View the individual Leg Extension standards and next strength-level target.
- Leg Press (45° Sled) — Use this related standards tool to compare a registry-approved neighboring exercise without mixing its result into this comparison.
- Machine Hack Squat — Use this related standards tool to compare a registry-approved neighboring exercise without mixing its result into this comparison.
- Safety Bar Squat — Use this related standards tool to compare a registry-approved neighboring exercise without mixing its result into this comparison.
- Seated Leg Curl — Use this related standards tool to compare a registry-approved neighboring exercise without mixing its result into this comparison.