| What it does | Free metric weight converter for milligrams, grams and micrograms
| Free fitness calculators for strength, training, nutrition and body composition
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| Founded | Not given
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| Pricing model | 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
| - One-rep max estimation from weight and reps
- Bench press, squat, deadlift and overhead press max calculators
- 5/3/1 training cycle generator
- TDEE and BMR calculators
- Macro and protein intake calculators
- Body fat percentage estimation using US Navy method
- Barbell plate loading calculator
- RPE and RIR conversion chart
- Calorie deficit and weight loss timeline calculator
- Warm-up set generator
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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
| - All formulas and sources cited on every page
- No sign-up required to use calculators
- Built on established, peer-referenced formulas from fitness and sports nutrition literature
- Works in both pounds and kilograms
- Built by a lifter
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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 | 13 |
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| Referring domains (Majestic) | 431 | 1 |
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Milligrams to Grams
RepMaths