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Science Calculators
Physics, chemistry, weather formulas, and scientific calculations — all with clear explanations.
41 free calculators · No signup required
What Are Science Calculators?
Physics, chemistry, earth science — energy, force, gas laws, chemical equations, environmental metrics. These cover the formulas you actually run into in coursework, lab work, or just trying to figure out why your circuit isn't working. Every tool applies the fundamental equations to real-world problems.
From Ohm's law to heat index, each calculator explains the underlying formula and shows how it applies in practice. I wrote the explanations for the person who remembers the concept but forgot the formula — or who needs to double-check their work before submitting it.
Frequently Asked Questions
What is Ohm's law?
Voltage = current × resistance (V = I × R). It's the most fundamental equation in electrical circuits — know any two of the three values and you can solve for the third.
How is heat index calculated?
Heat index combines air temperature with relative humidity to estimate how hot it actually feels outside. The NWS uses a regression equation with several coefficients. The basic idea: when humidity is high, your sweat can't evaporate as fast, so 90°F at 80% humidity feels a lot worse than 90°F at 30%.
What is the difference between speed and velocity?
Speed only tells you how fast (60 mph). Velocity tells you how fast and in what direction (60 mph north). In physics, this matters because velocity is a vector, and speed is a scalar. In everyday conversation, most people use them interchangeably.