| What it does | Free Erlang C calculator for contact center staffing and service level planning
| Free Mifflin-St Jeor calculator that shows every step of the equation
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| Stage | Not given
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| Founded | Not given
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| Based in | ES
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Calculates minimum agents needed for service level targets
- Erlang C probability and queuing formulas
- Computes average speed to answer (ASA)
- Shows agent occupancy and utilization
- Generates comparison table of agents and metrics
- CSV export for Excel analysis
- Embedded iframe version for websites
| - Shows full equation working with step-by-step substitution
- Multiple activity levels from sedentary (×1.2) to extra active (×1.9)
- Katch-McArdle calculator using body fat percentage
- Step-based TDEE estimation
- Adaptive TDEE calculator from weight changes
- Embeddable calculator iframe
- Metric and imperial unit switching
- Comparison with other equations like Harris-Benedict
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| What makes it different | - No registration required, runs in browser without sending data
- Preset buttons for Spain's Law 10/2025 compliance targets
- Based on ITU-T E.600 recommendation and ITU-D teletraffic engineering
- Uses stable numerical recursion method for any agent count
- Completely free with no advertising when embedded
| - Shows all working so users can verify the math themselves
- Uses the most accurate equation for healthy adults
- Multiple calculation methods beyond basic equation
- Transparent about accuracy limitations and sources
- Completely free with no tracking or cookies
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 16 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 0 | 1 |
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| Citation Flow (Majestic) | 4 | 16 |
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| Referring domains (Majestic) | 3 | 3 |
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CallsIQ
TDEE Steps