| What it does | Free screen size calculator that compares TVs and monitors to scale
| Free Karvonen formula heart rate zone calculator
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| Stage | Not given
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| Founded | Not given
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| Based in | RO
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| Pricing model | Freemium
| Free
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| Pricing | Free calculators; optional Planning Pack €9 one-time purchase
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| Key features | - Side-by-side display comparison at true scale
- Calculate physical dimensions from resolution and diagonal
- Pixel density (PPI) calculations
- Field of view angle visualization
- Preset lists of monitors, TVs, laptops and phones
- Pixels per degree (PPD) calculator
- TV mounting height calculator
- Curved monitor radius support
- Optional Planning Pack PDF export
| - 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 | - Draws every display to scale for visual comparison instead of guessing
- Uses THX and pixel-per-degree references for viewing recommendations
- Augmented reality shows actual screen size on your wall
- Free to use with no account or signup required
- Independent with no manufacturer influence on calculations
| - 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) | 1 ● no change since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 4 | 19 |
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| Citation Flow (Majestic) | 24 | 25 |
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| Referring domains (Majestic) | 18 | 40 |
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DisplayMath
CalculateMyHeartRate