RC Transient Calculator
Model an ideal first-order capacitor voltage after a DC step or discharge.
Loading tool…
How to use RC Transient Calculator
Time constant τ=RC; voltage V(t)=final+(initial−final)×exp(−t/τ). Near the initial state, the equivalent expm1 form retains small changes; later, the exponential form preserves the remaining tail.
- Enter resistance (ohms), capacitance (farads), initial voltage, final source voltage, elapsed seconds.
- Check the model, units, and supported limits before calculating.
- Run the tool, inspect the result, then copy or download it.
Good to know
- Positive resistance and capacitance, nonnegative elapsed seconds. SI units, ideal linear first-order model only; no hardware safety or component suitability claim. A nonzero zero-target tail below the numeric range is rejected.
- Runs locally. Numeric inputs are bounded; floating-point output is approximate and rounded to 12 significant digits. Unsupported or non-finite calculations produce an error.
Common questions
How does RC Transient Calculator calculate its result?
Time constant τ=RC; voltage V(t)=final+(initial−final)×exp(−t/τ). Near the initial state, the equivalent expm1 form retains small changes; later, the exponential form preserves the remaining tail.
What assumptions and boundaries apply?
Positive resistance and capacitance, nonnegative elapsed seconds. SI units, ideal linear first-order model only; no hardware safety or component suitability claim. A nonzero zero-target tail below the numeric range is rejected.
Keep going with related tools
All math →Ohm’s Law and DC Power Calculator
Solve voltage, current, resistance, and power from an explicit independent input pair.
MathSeries and Parallel Resistor Calculator
Reduce a bounded list of ideal resistances in one simple series or parallel topology.
CalculatorsUnit Converter
Convert length, mass, temperature, and digital data units with explicit decimal and binary data sizes.
MathFirst-order RC Filter Calculator
Find a single-pole RC cutoff and ideal unloaded gain/phase at an entered frequency.
CalculatorsPassive DC Node Network Workbench
Solve a small arbitrary resistor topology from fixed DC node voltages and inspect exact KCL and power balances.
MathIdeal Op-amp Gain Calculator
Calculate a fixed inverting/noninverting ideal gain and compare the unclipped output with user-entered bounds.