| What it does | Free online calculators with step-by-step workings and cited sources, embeddable on any website
| Free one rep max calculator with seven formulas and percentage charts
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| Stage | Startup
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| Founded | 2026
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| Based in | GB
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| Pricing model | Freemium
| Free
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| Pricing | Free plan: all calculators with ads, 5 saved calculations, 1 private link. Personal: $29 USD/year or $5/month with unlimited saved calculations, no ads, PDF and CSV export. Advisor: $149 USD/year or $19/month with client-facing branding, scenarios grouped by client, one PDF per client, and priority
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| Key features | - 1,336 calculators across 23 categories
- Step-by-step calculation workings shown live
- Cited sources on every calculator page
- Save and compare scenarios side by side
- Embed calculators on your website with three lines of code
- Update shared figures once across all embeds
- Export results as PDF or CSV
- Reusable assumption profiles
- Private read-only links with expiration
- Client management and reporting 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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| What makes it different | - Visible calculation working for every result, so you can inspect the math rather than trust blindly
- Every calculator declares its method and sources in code with checked examples
- Free embedding with your own branding and no tracking of readers
- Similar calculators are consolidated to one preferred page to avoid duplicate search 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) | 23 ▼ −1 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 24 | 0 |
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| Citation Flow (Majestic) | 34 | 0 |
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| Referring domains (Majestic) | 88 | 0 |
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CalculatorFox
OneRepMax