Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Physics
Ohm's Law and Power Calculator
Instantly calculate electrical power three ways — P = V·I, P = V²/R, and P = I²·R — using Ohm's Law. Use it to verify circuit designs, select resistors, or compare power expressions.
Fill in the required fields to see your result.
Physics
Decibel Calculator (Power Ratio)
Converts a ratio of two power levels into decibels using 10 × log10(P1 ÷ P2). Decibels express how many times larger or smaller one power is than another on a logarithmic scale used in acoustics, electronics, and signal processing.
Fill in the required fields to see your result.
Key differences
| Ohm's Law and Power Calculator | Decibel Calculator (Power Ratio) | |
|---|---|---|
| Category | Physics | Physics |
| Inputs required | 4 | 2 |
| Result | Result (units) | Level Difference (dB) |
| What it does | Instantly calculate electrical power three ways — P = V·I, P = V²/R, and P = I²·R — using Ohm's Law. Use it to verify circuit designs, select resistors, or compare power expressions. | Converts a ratio of two power levels into decibels using 10 × log10(P1 ÷ P2). Decibels express how many times larger or smaller one power is than another on a logarithmic scale used in acoustics, electronics, and signal processing. |