| What it does | Free one rep max calculator with seven formulas and percentage charts
| 200+ free online calculators for finance, health, math, and more with no sign-up required
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Seven 1RM formulas (Epley, Brzycki, Lombardi, Lander, Mayhew, O'Conner, Wathen)
- Average of all formulas as recommended result
- Percentage chart from 100% to 50% of 1RM
- Rep-max table for 1RM through 12RM
- Support for kilograms and pounds
- Exercise-specific formula defaults
- RPE adjustment for reps in reserve
- Multiple exercise categories (chest, back, legs, shoulders, arms, Olympic)
- Browser-based history with no account
- Warm-up sets calculator and rep-max table
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- No sign-up required to use any calculator
- Clear inputs and results with estimates labeled
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| What makes it different | - Uses seven published formulas instead of one, showing average and range for transparency
- No account, sign-up, or data storage required
- Covers dozens of exercises with exercise-specific guidance and lift variations
- Warns about formula accuracy limits and when estimates are unreliable
- Includes linked tools for related calculations (DOTS, Wilks, training max, FFMI, VO2)
| - Over 200 free calculators in one place
- Always free with no account or sign-up needed
- Organized by category for easy navigation
- Built and maintained by one person with AI assistance
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 8 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 5 |
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| Citation Flow (Majestic) | 0 | 20 |
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| Referring domains (Majestic) | 0 | 7 |
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OneRepMax