Boost Converter Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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A boost converter result can look convincing even when one unit or assumption is off. Power-electronics formulas are useful first-pass design tools, but ideal duty-cycle and component equations do not capture every switching loss or device limit. This page keeps the calculation narrow enough to trace the answer back to the values you enter.

What this calculator does

The Boost Converter Calculator connects Input voltage (Vᵢₙ), Output voltage (Vₒᵤₜ), Switching frequency (fₛw) to the page’s duty cycle. Supporting values are included only when they follow from the same relationship, so you can compare the headline with the quantities behind it.

How to use it

Enter Input voltage (Vᵢₙ), Output voltage (Vₒᵤₜ), Switching frequency (fₛw), Maximum ripple current (Iᵣᵢₚₚₗₑ) using the units shown beside each field. Keep all values from the same physical case, then check the headline result and any supporting values before changing one input at a time for comparison.

How the calculation works

For an ideal boost converter, duty cycle is D = 1 − Vin/Vout. The inductor estimate is L = Vin·D/(fsw·ΔI), using switching frequency and allowed ripple current.

Example

For Vin = 12 V, Vout = 24 V, fsw = 100 kHz, and allowed ripple current 1 A, the ideal duty cycle is 50%. The inductor estimate is L = 12×0.5/(100,000×1) = 60 µH.

How to interpret the result

Treat the duty cycle as an ideal circuit-design quantity for the entered topology and values. It is most useful for first-pass component sizing or comparison, followed by checks against ratings, tolerances, ripple, losses, and thermal behavior.

Limitations and notes

Real circuits include switch and diode losses, ESR/ESL, ripple, tolerances, thermal limits, control-loop behavior, transients, electromagnetic interference, and manufacturer derating that ideal equations may not capture. Recheck Input voltage (Vᵢₙ), Output voltage (Vₒᵤₜ) first if the result looks surprising, because an incorrect unit or definition there can dominate rounding error. Safety-critical or standards-based work still needs the applicable design rules and independent verification.