| What it does | Electronics calculators for makers
| The useful corner of the internet
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| GB
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| Pricing model | Freemium
| Freemium
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| Pricing | Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.
| Free: 3 public tool runs per 24 hours as guest, 10 runs with free account. Premium: £9 per month for unlimited access to all 123 public tools and 20 Premium workflows. Business Starter: £99 per month including everything in Premium plus one hosted custom business tool and one small monthly update. B
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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
| - VAT calculator
- Mortgage affordability calculator
- Word counter
- Image compressor and resizer
- Date difference calculator
- Strong password generator
- Unit converter
- CSV to JSON converter
- ROI calculator
- Meta tag generator
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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
| - All calculations run locally in the browser with no data transfer
- UK-focused defaults with editable assumptions
- Transparent methodology with visible formulas and sense-check results
- Quality checked before release including boundary values and mobile layouts
- Free public tools with optional Premium and Business plans
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ▲ +1 (up) since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 3 |
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| Citation Flow (Majestic) | 0 | 15 |
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| Referring domains (Majestic) | 0 | 3 |
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Ohmlark
UtilHub UK