USB Power Delivery Profiles Calculator
Look up standard USB-PD voltage/current profiles (5V, 9V, 15V, 20V, PPS). Compute cable current requirements and e-marker capabilities for a target load.
How to Use
- Enter required load power and voltage (or pick a standard PDO).
- Tool shows matching PDOs, required cable e-marker rating, and validates against USB-PD 3.1 spec.
Show Work
Standard PDOs
History of USB Power Delivery
USB-PD 1.0 (2012) raised USB power from 7.5W (5V/1.5A) to 100W (20V/5A) - enough to charge laptops. PD 2.0 (2014) added VBUS negotiation over CC lines that made USB-C ubiquitous. PD 3.0 (2017) introduced PPS (Programmable Power Supply, 3.3-21V in 50mV steps) for Li-ion direct-charge architectures. PD 3.1 (2021) EPR (Extended Power Range) adds 28V, 36V, 48V up to 5A = 240W, enough for gaming laptops. USB-C plus USB-PD has become the universal charging standard.
About This Calculator
Enter required load power and target voltage. The tool matches against USB-PD standard fixed PDOs (5/9/15/20/28/36/48V), computes current draw, and reports cable rating needed (3A/5A with e-marker) and spec compliance (USB-PD 2.0 SPR vs 3.1 EPR).
For production: USB-PD compliance requires certified source/sink controllers (Cypress CYPD, TI TPS65987) and USB-IF certification testing. Everything runs client-side.
About the USB Power Delivery Profiles Calculator
Meet the USB Power Delivery Profiles Calculator: a free, no-fuss tool for electronics and circuit design with nothing to install and no sign-up. Look up standard USB-PD voltage/current profiles (5V, 9V, 15V, 20V, PPS). Compute cable current requirements and e-marker capabilities for a target load.
How it works
Put each value in its box and read the answer as you go. Because it recalculates live, you can play with the inputs to see how each one moves the result — handy for checking your own working or planning ahead. Everything happens on your device, so it is fast and private.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
What is PDO?
Power Data Object — a 32-bit descriptor in PD packet specifying voltage/current pair. Sources advertise their PDOs, sinks pick one. Fixed PDO: exact V+I; PPS: programmable within a range (3.3-21 V, 50 mV steps).
E-marker?
Electronic marker chip in the USB-C cable reporting its rating. Above 3A current or 20V voltage, cable must have an e-marker. 5A cables need a 100W e-marker; 240W (EPR) cables need USB4 EPR e-markers.
EPR vs SPR?
SPR (Standard Power Range): 5-20V, up to 100W. EPR (Extended Power Range): adds 28V, 36V, 48V levels for up to 240W (48V × 5A). Requires USB-PD 3.1 and EPR-capable cables.
How do I use the USB Power Delivery Profiles Calculator?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Laptop Charger
65W typical: 20V × 3.25A. MacBook Pro 16" needs 140W: 28V × 5A (EPR).
Phone Fast Charge
Galaxy S24: 9V × 2.77A (25W) or PPS from 3.3-11V.
Monitor Power
USB-C monitor: 15V × 3A (45W) to charge laptop while displaying.
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