| What it does | Free marketing calculators for ROI, ROAS, customer lifetime value and profitability metrics
| Electronics calculators for makers
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| Stage | Established
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| Founded | 2018
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| Based in | CH
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| Pricing model | Free
| Freemium
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| Pricing | Not given
| Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.
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| Key features | - 40 marketing calculators across 7 topics
- Google Ads click price study for 38 industries
- Local browser calculation with no data transmission
- 24 knowledge articles and 37-term glossary
- Support for EUR, CHF and USD currencies
- Metrics linked across calculators for integrated analysis
| - 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
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| What makes it different | - Avoids inflated benchmarks; provides honest assessments for decision-making
- Regional focus on DACH countries with specific data
| - 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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 2 ● no change since last check | 1 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 24 | 0 |
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| Referring domains (Majestic) | 67 | 0 |
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Marketing-Rechner
Ohmlark