Math Calculators

Find what is X% of Y, percent increase or decrease, reverse percentages, and compound percent changes — with step-by-step solutions.

Interactive Riemann sum visualizer: enter a function and interval, choose Left, Right, Midpoint, or Trapezoidal, and drag n to watch the rectangles converge to the exact definite integral in real time.

Visualize 3D solids formed by revolving functions around axes. Calculate volume and surface area in real-time using Disk, Washer, and Shell methods.

Interactive spring-mass-damper simulator for differential equations and mechanical vibration — free, damped, forced, and resonance response with live solution decomposition.