Math Calculators
Choose a focused calculator for everyday percentages and number work, or use the physics tools when a result depends on a defined model and physical assumptions.
Featured tools
A focused starting point for this category.
Free Fall With Air Resistance Calculator
Calculate fall time, impact speed and terminal velocity using the analytical quadratic-drag model.
Math
Potential Energy Calculator
Calculate near-Earth gravitational, universal gravitational and elastic spring potential energy.
Math
Percentage Calculator
Calculate a percentage of a number, percent of a total and percentage change.
Math
Which tool should I use?
Start with the kind of question you need to answer. Applied-physics tools expose more model inputs; quick-number tools are intended for simple checks.
Applied physics
Model motion with drag or calculate gravitational and elastic potential energy.
Percentages and proportions
Work with percentages, ratios and common proportional calculations.
All Math
3 free browser-based tools
Percentage Calculator
Calculate a percentage of a number, percent of a total and percentage change.
Math
Free Fall With Air Resistance Calculator
Calculate fall time, impact speed and terminal velocity using the analytical quadratic-drag model.
Math
Potential Energy Calculator
Calculate near-Earth gravitational, universal gravitational and elastic spring potential energy.
Math
About Math Calculators
Use applied-physics calculators for model-based questions or the focused number tools for quick checks. Inputs and formulas are shown where they help explain the result.