API · /powerfactor-api

Power Factor & AC Power API

healthy 4,602 Subscribers

AC power triangle and power-factor maths as an API, computed locally and deterministically. The power-factor endpoint solves the power triangle: from any two of the apparent power S (volt-amperes), the real power P (watts), the reactive power Q (VAR), the power factor (cos φ) or the phase angle it returns all of them, using S = √(P²+Q²), P = S·cosφ, Q = S·sinφ and PF = P/S. The load endpoint computes the powers of a load directly from its voltage, current and power factor — single-phase S = V·I or three-phase S = √3·V·I from line values. The correction endpoint sizes power-factor correction: the reactive power a capacitor must supply to raise the power factor from a present value to a target, Qc = P·(tanφ1 − tanφ2), and — given the supply voltage and frequency — the capacitance, C = Qc/(2π·f·V²), the basis of cutting reactive demand and utility penalties. Everything is computed locally and deterministically, so it is instant and private. Ideal for electrical-engineering and power-systems tools, motor, industrial and HVAC load analysis, energy-billing and power-quality apps. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is AC power and power-factor correction; for Ohm's law, reactance and resonance use an Ohm's-law API.

#power-factor #ac-power #electrical-engineering #power-systems #pf-correction #developer-tools

api.oanor.com/powerfactor-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/powerfactor-api/openapi.json

/api/powerfactor-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 91 ms; Server probes · 24h
Subscribers: 4,602; active
Total calls: 32; last 7 days

Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

2,000 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
Solve the power triangle from any two of P, Q, S or angle
Power-factor + apparent/real/reactive power output
Deterministic results, no upstream data cost
2 requests/sec

Starter

€9.00 /month

30,000 calls / month
6 requests / second
Hard cap (429 above quota, no overage)
Full AC power-triangle solver (P, Q, S, PF, angle)
Leading/lagging PF classification
PF-correction capacitor sizing (kVAR)
Email support

Pro

€24.00 /month

200,000 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
High-volume power-systems integration
Three-phase + single-phase power calculations
Batch power-triangle solving
Priority support

Mega

€75.00 /month

1,500,000 calls / month
60 requests / second
Hard cap (429 above quota, no overage)
Unmetered-scale electrical-engineering compute
SLA-backed uptime for embedded SCADA/EMS tools
60 requests/sec burst capacity
Dedicated engineering support

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Three-Phase Power API

Three-phase AC power maths as an API, computed locally and deterministically. The power endpoint solves the three-phase power triangle from the line-to-line voltage, the line current and the power factor — the apparent power S = √3·V_L·I_L in volt-amperes, the real power P = S·cosφ in watts, the reactive power Q = S·sinφ in VAR and the phase angle — or works backwards to find the line current a load draws for a given real power. The wye endpoint gives the star-connection relationships, where the line-to-line voltage is √3 times the phase voltage and the line and phase currents are equal. The delta endpoint gives the delta-connection relationships, where the line and phase voltages are equal and the line current is √3 times the phase current. Supply a line or phase quantity and it returns the rest. Everything is computed locally and deterministically, so it is instant and private. Ideal for electrical, motor, industrial-automation, solar-inverter and building-services app developers, switchboard and motor-sizing tools, and electrical-engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is balanced three-phase power; for the single-phase power triangle use a power-factor API and for voltage drop a voltage-drop API.

api.oanor.com/threephase-api

Voltage Drop API

Cable voltage-drop and conductor-sizing maths as an API, computed locally and deterministically. The drop endpoint computes the voltage lost along a cable run from the current, the one-way run length, the conductor cross-section and the material: the conductor resistance R = ρ·L/A, the voltage drop Vd = k·I·R (k = 2 for single-phase, √3 for three-phase), the drop as a percentage of the supply and the voltage left at the load. The sizing endpoint works backwards: from an allowable percentage drop it returns the minimum conductor cross-section needed, A ≥ k·I·ρ·L/Vd_allow, rounds up to the next standard cable size (1.5, 2.5, 4, 6, 10, 16, 25 … mm²) and reports the actual drop at that size. The power endpoint computes the power dissipated as heat in the cable, P = N·I²·R (N = 2 or 3 current-carrying conductors), and the cable efficiency given a load power. Copper (ρ = 0.0172) and aluminium (ρ = 0.0282 Ω·mm²/m) are supported. Everything is computed locally and deterministically, so it is instant and private. Ideal for electrical-installation and panel-design tools, cable selection to wiring-regulation limits, solar, EV-charger and sub-main sizing, and electrical-engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is cable voltage drop and sizing; for Ohm's law, reactance and resonance use an Ohm's-law API and for transformer ratios use a transformer API.

api.oanor.com/voltagedrop-api

Transformer Ratio API

Ideal-transformer relations as an API, computed locally and deterministically. The transformer endpoint works from the turns ratio a = Np/Ns = Vp/Vs = Is/Ip: give any ratio-defining pair — the primary and secondary turns, voltages or currents — and it derives the rest, classifies the transformer as step-up, step-down or 1:1 isolation, and reports the primary and secondary apparent power (which are equal for an ideal transformer, so a step-down in voltage is a step-up in current). The power endpoint applies the power balance with an efficiency, Ps = η·Pp, from the primary or secondary power (given directly or as voltage times current) and reports the power loss. The impedance endpoint reflects an impedance across the transformer, Zp/Zs = (Np/Ns)² = a² — the basis of impedance matching, so an 8 Ω speaker on a 10:1 transformer looks like 800 Ω to the source. Everything is computed locally and deterministically, so it is instant and private. Ideal for electrical and electronics-engineering tools, power-supply and audio-amplifier design, impedance-matching and EE-education apps. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is ideal-transformer ratios; for Ohm's law, reactance and series/parallel components use an Ohm's-law API.

api.oanor.com/transformer-api

Coulomb & Electric Field API

Coulomb's-law electrostatics as an API, computed locally and deterministically. The force endpoint computes the electrostatic force between two point charges, F = k·q1·q2/(εr·r²) — Coulomb's law, with k = 8.9876×10⁹ N·m²/C² — from the two charges, their separation and an optional relative permittivity for a dielectric medium, and tells you whether the force is attractive (opposite signs) or repulsive (like signs). The field endpoint gives the electric field of a point charge, E = k·q/(εr·r²), its direction (away from a positive charge, toward a negative one), and the force on a test charge placed there, F = q_test·E. The potential endpoint gives the electric potential V = k·q/(εr·r) and, for a pair of charges, the electrostatic potential energy U = k·q1·q2/(εr·r) in joules and electron-volts. Charges may be entered in coulombs, microcoulombs or nanocoulombs. Everything is computed locally and deterministically, so it is instant and private. Ideal for physics and electrical-engineering education tools, electrostatics and field-theory apps, and laboratory and simulation software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is electrostatics; for Ohm's law and DC/AC circuits use an Ohm's-law API.

api.oanor.com/coulomb-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Power Factor & AC Power API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Power Factor & AC Power API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Power Factor & AC Power API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Power Factor & AC Power API cost?

Power Factor & AC Power API has a free tier with 100 calls / month. Paid plans start at €9.00 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Power Factor & AC Power API GDPR-compliant?

All requests to Power Factor & AC Power API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Power 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/correction

Power-factor correction

Playground

Parameters

Custom headers

Language: Client:

GET /v1/load

Power from voltage & current

Playground

Parameters

Custom headers

Language: Client:

GET /v1/power-factor

AC power triangle

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/powerfactor-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/powerfactor-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/powerfactor-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/powerfactor-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

New thread

📌 Pinned 🔒 Locked

· ·

🔒 This thread is locked — no new replies.

No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.

Pick a key

Plaintext is shown once at creation — use the prefix as a reminder.

Power Factor & AC Power API

API health

Pricing

Built by

Related APIs

Three-Phase Power API

Voltage Drop API

Transformer Ratio API

Coulomb & Electric Field API

Frequently asked questions

Parameters

Parameters

Parameters

Code snippets

Ratings

Discussion

New thread

📌 🔒

Support

Open new ticket

Your cookie choices