| What it does | Free online calculators and tools that run entirely in your browser
| 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 | - Paycheck calculator for all 50 US states and DC
- 2025-2026 tax deduction calculators for overtime, tips, and charitable giving
- PDF to Word converter with scanned page support
- Mortgage and auto loan calculators
- Image resizing, format conversion and compression tools
- JSON formatter and validator
- Retirement and investment calculators
- Everyday calculators for time, measurements and fitness
| - 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 | - All tools run entirely in browser with no server upload
- No signup, download or installation required
- Over 100 free calculators and tools with no watermarks or ads on results
- Updated daily to reflect new tax laws and government guidance
| - 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) | 1 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 2 | 0 |
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| Citation Flow (Majestic) | 26 | 13 |
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| Referring domains (Majestic) | 45 | 1 |
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Tools Berry
BuildWire Calc