| What it does | Free Mifflin-St Jeor calculator that shows every step of the equation
| Offline calculators for electricians, builders and HVAC technicians
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| US
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| Pricing model | Free
| Freemium
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| Pricing | Not given
| Free: nine calculators (voltage drop, Ohm's law, watts to amps, concrete slab, roof pitch, board feet, BTU, CFM, BTU to kW), no time limit. Pro: $9.99 per year or $19.99 lifetime (one payment, no renewal).
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| Key features | - 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
| - Wire sizing and voltage drop calculations
- Conduit fill and box fill calculations
- Offline operation with no network required
- Transparent calculation steps and NEC warnings
- Job organization and PDF/CSV export
- Motor and generator sizing calculators
- Power and conversion calculators
- Building calculations for concrete and roof pitch
- No ads and no account required
- Private with data staying on device
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| What makes it different | - 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
| - Works completely offline with no network or cellular signal required
- Private by design with no account, no ads, and calculations never leaving your device
- Shows exact NEC formulas and calculation steps so you can verify results before fieldwork
- Over 35 specialized calculators covering electrical, building and HVAC trades
- Tested code with automated tests against independently worked examples
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 16 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 16 | 13 |
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| Referring domains (Majestic) | 3 | 1 |
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TDEE Steps
BuildWire Calc