Physics Calculator

Use SI units whenever possible: meters (m) for distance, seconds (s) for time, kilograms (kg) for mass, newtons (N) for force, joules (J) for work and energy, watts (W) for power, pascals (Pa) for pressure, amperes (A) for current, and ohms (Ω) for resistance. The calculator also shows common conversions like km/h, kW, g/cm³, and kPa as a secondary insight. If you enter mixed units, convert first so the formula inputs match their stated units.

Yes—negative velocity and negative acceleration can be physically meaningful, depending on your chosen direction. In one-dimensional problems, you typically pick a positive direction (for example, “to the right”), and values pointing the other way become negative. The tool allows negative velocity inputs for modes where direction matters, and it allows negative acceleration because objects can slow down or accelerate in the opposite direction. However, quantities like mass, time, area, and volume must remain greater than zero.

Several modes divide by a quantity, such as time in speed, acceleration, and power, or area in pressure, or volume in density. A zero denominator would make the formula undefined (division by zero), so the tool blocks it to prevent misleading outputs. In real measurements, a value of exactly zero for time, area, or volume usually indicates a data-entry mistake or missing unit conversion. Enter a realistic positive value, then confirm the displayed unit label matches what you intended to measure.

Rounding is controlled by the Advanced decimal setting (0–8). The calculator applies the chosen precision consistently to the final result and the step-by-step display so you see a coherent calculation story. For quick checks, 2 decimals is usually enough. For classroom work, you might choose 1–3 decimals depending on the problem statement. For lab reporting, you can match the precision of your measurement tools. If you need significant figures rather than fixed decimals, use a decimal level that reflects your data quality.

The secondary card provides a helpful conversion or context that pairs naturally with the primary result. For speed, it shows km/h. For power, it switches to kW when values are large enough to be meaningful. For density, it shows g/cm³ for quick material comparisons. For pressure, it shows kPa. When the mode doesn’t have a standard conversion, the card gives a concise interpretation or cross-check to help you spot errors. The goal is to make the output easier to verify at a glance.

The animated bar is a visual guide to relative magnitude, not a replacement for the numeric result. It uses a sensible range per mode (for example, typical speeds or everyday pressures) and fills proportionally up to that range. If your value exceeds the display maximum, the bar clamps at the end so the visualization stays readable, but the exact number is still shown clearly in the result. Use the bar to quickly judge “low vs typical vs high,” then rely on the numeric output for final work.

Use the copy buttons under the results. “Copy Result” captures only the mode name plus the final value and units—ideal for short answers. “Copy Full Summary” includes your inputs with units and the step-by-step substitution, which is useful for showing method. “Copy Page Summary” gives a brief explanation of what this Physics Calculator does and lists the supported modes along with the website URL. Copy works on desktop and mobile using the Clipboard API, with a fallback method if needed.

No. The calculator runs locally in your browser, and it does not transmit input values to a server. When you enter numbers, compute results, and copy text, those actions happen on your device. This design is helpful for privacy and also makes the tool fast and responsive. If you refresh the page or press Reset, the tool clears the displayed values and results. For best practice, still avoid entering sensitive personal data—physics inputs are usually measurements, so privacy concerns are typically minimal.