Single-Phase to Three-Phase Load Calculator

Most of a building is single-phase circuits, yet they all terminate on a three-phase main. Every socket and light lands on one of the three lines — so balancing a board means understanding what one single-phase load does to one of those three phases.

Single-Phase to Three-Phase Load Calculator takes a single-phase load, reports the current it draws on its host phase, and puts it in three-phase context: its span of the total kVA and the feeder share it represents.

Everything runs in the browser; nothing is uploaded.

• Phase voltage entry: 230 V typical, or your system voltage.
• Power factor: Current and VA computed with your load pf.
• Three-phase context: Equivalent three-phase kW and feeder share.
• Phase balance view: Enter three loads and see each phase's draw.
• Live formula: I = P / (V x pf), shown as computed.
• Export: Copy or download the analysis as text, CSV or JSON.
• Learning guide: Why panels must be balanced.

1. Enter the single-phase load in watts.
2. Set the phase voltage (line-to-neutral).
3. Set the power factor of the load.
4. Read the current that phase now carries.
5. Balance check: add sibling loads and see the per-phase draw.
6. Export the panel note if needed.

Example 1 — Oven. 3,000 W on 230 V single-phase, pf 1: 13.0 A on one phase.

Example 2 — Board context. That oven is 20% of a 15 kW feeder on the same phase.

Example 3 — Balancing. Three equal 2.3 kW circuits on L1, L2, L3 draw 10 A each — balanced, neutral near zero.

Example 4 — All on one. The same three loads stacked on L1: 30 A on that phase, 0 on the others.

• Phase-aware loading: See which line a circuit lands on and with what current.
• Balance made visible: Spot the overloaded phase before thermal trouble.
• Explained maths: formula shown live in the panel note.
• Export ready: Text, CSV and JSON for load schedules.
• Free and private: No uploads, no accounts, no logging.