Battery Power Simulation
for Electronics
Find out how long your battery lasts, how much power your circuit draws, and how it discharges over time — for IoT devices, embedded systems, and portable electronics.
Electronics Formulas
From Ohm's Law to radar range equations. 32 categories covering basic electronics, RF, power supplies, PCB design, motors, sensors, and more — solve for any variable, with built-in unit selectors.
Unit Converters
Voltage, current, resistance, capacitance, inductance, power, energy, frequency, time, charge, magnetic flux, and temperature. Instant conversion across every standard prefix.
Telemetry Integration
Log real current and voltage from your microcontroller as a simple CSV, then chart the actual discharge curve and sharpen your battery-life prediction with measured data instead of estimates.
Input 10 values, get everything.
Build your own calculator: chain inputs, library formulas, and custom expressions over one shared set of values. Add a formula and the inputs it needs appear automatically; results flow downstream and recompute live — every value dimension-checked so volts never silently become amps.
All 438 formulas are verified against an independent reference implementation. Our test suite checks every calculator result against separately computed values, so the numbers you get are the numbers you can trust.
Formula Categories
32 categories, 438 formulas — all free to use.
Sign up free, pick up anywhere.
A free account keeps your projects, flows, and formula history in sync across every device — and unlocks the API. Free while VBatPower is in beta.
- Sync everywhere
Projects, flows, and formula history on every device — resume exactly where you left off.
- API + keys
Push device telemetry and pull results over the REST API with your own API keys.
- Free in beta
The whole workspace is free while VBatPower is in beta — no account or card needed to start.