| What it does | Live gold prices per gram for 10K–24K gold, updated every 30 seconds
| Free Karvonen formula heart rate zone calculator
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| Stage | Not given
| Established
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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 | - Real-time gold prices for 10K, 14K, 18K, 21K, 22K and 24K gold
- Prices update every 30 seconds from live market feed
- Gold calculator: enter weight and karat to see melt value
- Scrap gold calculator for multiple items at once
- Pawn shop calculator to estimate offers by payout percentage
- Price history charts over 30 days and one year
| - Five personalized training zones based on heart rate reserve
- Accounts for resting heart rate and cardiovascular fitness
- Custom maximum heart rate input from multiple formulas
- No signup required, runs entirely in browser
- Weekly resting heart rate logging and progress tracking
- Zone-specific training guidance for different goals
- Shareable and printable zone results
- Embeddable calculator widget for websites
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| What makes it different | - Fast, no signup or ads required
- Transparent calculations showing where the price comes from
- Built for mobile shopping: works properly on a phone in a shop
- Independent project with no referral fees or data sales
| - More accurate than age-only formulas, accounting for individual cardiovascular fitness
- Zones adapt as your fitness improves and resting heart rate drops
- Based on 1957 Karvonen research used by coaches and sports scientists
- Independent, no data collection or external servers
- No ads inside the calculator, free to use with optional embedding
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 21 ● no change since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 8 | 19 |
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| Citation Flow (Majestic) | 27 | 25 |
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| Referring domains (Majestic) | 40 | 40 |
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CalculateMyHeartRate