Calculators

Calculate RC time constant, settling time, cutoff frequency, and charge/discharge progress.

Calculate capacitor or inductor reactance at an AC frequency.

Decode 4-band and 5-band resistor color codes.

Solve Reynolds number and its fluid-flow variables.

Calculate RL filter cutoff frequency or solve R or L.

Calculate series RLC resonance, Q, bandwidth, impedance, and damping.

Convert RMS, peak, and peak-to-peak waveform values or find RMS from samples.

Calculate ROI, net return, cost basis, and optional annualized return.

Solve K = ½Iω² for rotational energy, inertia, or angular speed.

Find running pace per km or mile from distance and time.

Convert annual salary to hourly and other gross pay equivalents.

Find sales tax, final price, pre-tax price, or tax rate.

Estimate the monthly contribution needed to reach a savings target.

Scientific math functions with degree and radian modes.

Combine resistors in series or parallel and calculate total current and power.

Solve pendulum period, frequency, length, or gravity.

Estimate conductor skin depth from frequency and material properties.

Solve Q = mcΔT for heat, mass, specific heat, or temperature change.

Mean, median, mode, variance, standard deviation, and more.

Solve linear thermal expansion with ΔL = αL₀ΔT.

Find tip, total, and per-person split for a bill.

Solve torque, force, or lever arm with τ = rF sin(θ).

Calculate transformer turns ratio, secondary turns, current, and reflected impedance.

Solve triangle sides, angles, area, and perimeter.