| What it does | Free metric weight converter for milligrams, grams and micrograms
| Free one rep max calculator with seven formulas and percentage charts
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Live results as you type with no submit button or page reload
- Exact decimal arithmetic with no rounding drift
- Converts in both directions: milligrams to grams and grams to milligrams
- Includes micrograms as a first-class unit in the full mcg to mg to g chain
- Privacy by design with calculations running entirely in browser
- Results display up to ten decimal places with at least four significant digits for small values
- Copy button to place full equation on clipboard
- Common values quick-access chips for frequent conversions
| - 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 | - Exact results using SI definitions with no approximation or rounding error
- Entirely free with no account, paywall, usage limit or installation required
- Nothing sent to servers: all calculations run in your browser for complete privacy
- Educational guides explaining practical contexts where these units matter
| - 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) | 1 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 17 | 0 |
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| Citation Flow (Majestic) | 30 | 0 |
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| Referring domains (Majestic) | 431 | 0 |
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Milligrams to Grams
OneRepMax