| What it does | Free online pressure converter between kilopascals and pounds per square inch
| Free one rep max calculator with seven formulas and percentage charts
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Live pressure converter with bidirectional conversion between kPa and PSI
- Instant automatic calculation as you type
- Educational content explaining conversion formulas and pressure units
- Common conversion tables and examples
- Clear explanations of PSI and kPa differences
| - 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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| What makes it different | - Accuracy checked against NIST and BIPM standards
- Completely free with no account or credits required
- Created by a Graduate Civil Engineer with technical expertise
- Focuses on helping users understand the calculations, not just conversion results
| - 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)
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 7 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 4 | 0 |
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| Citation Flow (Majestic) | 13 | 0 |
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| Referring domains (Majestic) | 11 | 0 |
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kPa to PSI
OneRepMax