| 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
| - Country-specific calculators for US, UK, Canada, Australia, New Zealand, South Africa, Ireland, Germany, and Netherlands
- Annual rate guides with tax-year specificity
- Free downloadable log templates in Excel, Google Sheets, and PDF
- Source citations linking calculations to IRS, HMRC, CRA, and ATO publications
- Support for multiple vehicle types and mileage purposes
- Miles and kilometers input support
- Reimbursement policy and form templates
- Direct monitoring of government rate changes and updates
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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)
| - Official source citations on every rate and calculation
- No affiliate relationships or commercial sponsorships influencing calculations
- Single workflow from rate lookup to estimate to recordkeeping
- Tax-year specific rates updated annually from official government sources
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OneRepMax