| What it does | Electronics calculators for makers
| Measure rooms and plan DIY flooring projects with feet, inches and metric units
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| Stage | Not given
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| Founded | Not given
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| Pricing model | Freemium
| Free
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| Pricing | Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.
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| Key features | - Resistor Color Code: read 4, 5 and 6-band resistors or find bands for a value
- LED Resistor: pick the current-limiting resistor and power rating
- Voltage Divider: output voltage, loading effect, or solve R2 for target Vout
- RC Filter: cutoff frequency, time constant and attenuation at any frequency
- LC Resonance: resonant frequency, characteristic impedance and Q
- 555 Timer: astable frequency/duty cycle and monostable pulse width
- Battery Life: runtime from capacity, active/sleep current and duty cycle
- PCB Trace Width: IPC-2221 trace width for current and temperature rise
- Electronics Unit Converter: SI prefixes, AWG to mm², mil to mm, dBm to mW, oz copper
| - Calculate area in feet, inches, decimal feet, meters and centimeters
- Support for rectangular, L-shaped, circular and triangular rooms
- Add up to 20 rooms together
- Automatic unit conversion between feet, inches and metric
- Flooring calculator for waste allowance and whole-box rounding
- Handles closets, alcoves and cutouts
- View formulas and assumptions
- No account required
- Fractional inches support
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| What makes it different | - Real E-series resistor values, not ideal numbers
- Engineering notation input and result sharing as links
- No ads, no tracking, no sign-up for free calculators
- Whole-device BOM costing and battery-life summary in Pro
- Works on phone at the bench
| - Correctly handles feet and inches together without requiring manual conversion
- Includes measuring diagram for L-shaped rooms
- Explains the difference between measured area, waste allowance and whole-box rounding
- Calculations stay private in your browser with no account needed
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ▲ +1 (up) since last check | 14 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 7 |
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| Citation Flow (Majestic) | 0 | 16 |
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| Referring domains (Majestic) | 0 | 23 |
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Ohmlark
Square Footage Calculator