VRMS ↔ WATTS CALCULATOR
Pick 1/2/4 Ω, or choose Custom to enter any load.
From Vrms → Watts:
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From Watts → Vrms (target):
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TONE GENERATOR (SINE)
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Level: 0 dB
▶ Pro Tips for Car Audio Installs
• Use this when setting gains with a multimeter—enter target Watts + load (Ω) to get exact Vrms to aim for.
• Example: 1000W @ 2Ω → target ≈ √(1000×2) = 44.7 Vrms on a 40–60 Hz sine test tone.
• Keep it clean: avoid clipping; clean power > distorted power for woofer survival.
• Verify wiring (series/parallel) so the actual load matches your selection.
• Leave 5–10% headroom for daily systems; don’t tune right at the driver’s max rating.
• Example: 1000W @ 2Ω → target ≈ √(1000×2) = 44.7 Vrms on a 40–60 Hz sine test tone.
• Keep it clean: avoid clipping; clean power > distorted power for woofer survival.
• Verify wiring (series/parallel) so the actual load matches your selection.
• Leave 5–10% headroom for daily systems; don’t tune right at the driver’s max rating.
▶ Quick Reference: Target Vrms
| Watts | 1 Ω | 2 Ω | 4 Ω |
|---|---|---|---|
| 12 W | 3.46 V | 4.90 V | 6.93 V |
| 25 W | 5.00 V | 7.07 V | 10.0 V |
| 50 W | 7.07 V | 10.0 V | 14.1 V |
| 75 W | 8.66 V | 12.2 V | 17.3 V |
| 100 W | 10.0 V | 14.1 V | 20.0 V |
| 500 W | 22.4 V | 31.6 V | 44.7 V |
| 1000 W | 31.6 V | 44.7 V | 63.2 V |
| 2000 W | 44.7 V | 63.2 V | 89.4 V |
▶ Microphone VU Meter (beta)
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Right
— / — dBFS
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Needs microphone permission over HTTPS. Relative meter (not calibrated SPL). If only mono input is available, the Right bar hides automatically.