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API · /firewood-api

Firewood Calculator API

healthy 4,795 Subscribers

Firewood maths as an API, computed locally and deterministically. The volume endpoint turns a wood-stack's length, height and depth (in feet or metres) into its volume in cubic feet and cubic metres, full cords, face cords and steres — a full cord being 128 cubic feet (a 4×4×8 ft stack) and a face cord being an 8×4 ft stack by the piece (log) length. The convert endpoint converts a quantity between cords, face cords, steres, cubic metres and cubic feet, using the piece length for the face-cord relationship. The heat endpoint estimates the heating value of a number of cords by wood species — returning the millions of BTU and the equivalent gallons of heating oil, therms of natural gas and kilowatt-hours — from a built-in table of typical seasoned-wood values (oak, hickory, maple, ash, birch, pine and more) or a custom figure. Everything is computed locally and deterministically, so it is instant and private. Heat values are typical seasoned figures (around 20% moisture) and vary with species, dryness and stove efficiency. Ideal for firewood sellers and delivery tools, heating and homestead apps, and forestry and woodlot calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is firewood volume and energy; for general volume or unit conversion use a unit-conversion API.

#firewood #cord #heating #forestry #wood #developer-tools
api.oanor.com/firewood-api
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Machine-readable spec so AI agents can integrate this API.

/api/firewood-api/openapi.json
/api/firewood-api/llms.txt

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
84 ms
Server probes · 24h
Subscribers
4,795
active
Total calls
36
last 7 days
status Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 11,035 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 11,035 calls/month
  • 2 req/sec
  • Volume + convert + heat
  • No credit card
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Starter

€12.55 /month

  • 20,650 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 20.65k calls/month
  • 8 req/sec
  • Face cords + species heat values
  • Email support
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Pro

€32.45 /month

  • 256,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 256.5k calls/month
  • 20 req/sec
  • Firewood / forestry pipelines
  • Priority support
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Mega

€70.45 /month

  • 1,325,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.325M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Degree Day API

Heating and cooling degree-day maths as an API, computed locally and deterministically. The daily endpoint computes the heating degree days, HDD = max(0, base − mean), and the cooling degree days, CDD = max(0, mean − base), for a single day from a base temperature and the daily mean — or the minimum and maximum, since the mean is taken as their average. The period endpoint sums the degree days over a list of daily temperatures (means or min/max pairs), returning the total HDD and CDD, the count of heating and cooling days and the average temperature — the standard way to characterise a heating or cooling season. The energy endpoint turns degree days into an energy estimate: the heat delivered is UA·DD·24/1000 kWh from the building heat-loss coefficient, the fuel or electricity input is that divided by the boiler efficiency (or a heat-pump COP), and — with an energy price — the cost. Everything is computed locally and deterministically, so it is instant and private. Ideal for building-energy, HVAC and facilities tools, heating-bill and fuel-budget estimation, weather-normalisation and energy-benchmarking apps, and engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is degree-day demand estimation; for U-value and heat-loss fabric calculations use a U-value API.

api.oanor.com/degreeday-api

HVAC BTU Calculator API

HVAC sizing maths as an API, computed locally and deterministically from standard rule-of-thumb factors. The cooling endpoint estimates the air-conditioner load for a room — in BTU per hour, tons of cooling and kilowatts — from the floor area (in square feet or metres, or length × width) using a baseline of about 20 BTU/h per square foot, with adjustments for the number of occupants, a kitchen, sun exposure and ceiling height. The heating endpoint estimates the heating load from the area and a climate zone (mild through very cold) or a custom BTU per square foot. The convert endpoint converts between BTU per hour, tons of cooling, kilowatts and watts (one ton = 12,000 BTU/h ≈ 3.517 kW). Everything is computed locally and deterministically, so it is instant and private. These are rule-of-thumb estimates in the EnergyStar style — a proper Manual J load calculation accounting for insulation, windows and local climate is recommended for a real installation. Ideal for HVAC and home-improvement tools, air-conditioner and heater sizing guides, smart-home and energy apps, and contractor quoting. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is HVAC sizing; for appliance running cost use an energy-cost API.

api.oanor.com/hvac-api

Log Scaling & Timber API

Log-scaling and timber maths as an API, computed locally and deterministically — the board-foot yield and cubic volume a logger, sawyer or forester scales a round saw log with. The boardfeet endpoint runs the three classic log rules at once from the small-end diameter inside bark and the length: Doyle = ((D − 4) ÷ 4)² × L, Scribner Decimal C ≈ (0.79·D² − 2·D − 4) × L ÷ 16, and the International ¼-inch rule by exact four-foot segments with a half-inch taper allowance, rounded to the nearest 5 board feet — so a 20-inch, 16-foot log scales 256 BF by Doyle, 272 by Scribner and 320 by International, neatly showing how Doyle under-scales small logs, International is the most accurate and Scribner sits between. The volume endpoint gives the cubic content by Smalian’s formula — the average of the two end cross-section areas times length — and Huber’s formula — the mid cross-section area times length, usually the most accurate — both in cubic feet and cords (128 ft³ = 1 cord). Everything is computed locally and deterministically, so it is instant and private. Ideal for forestry, logging, sawmill, timber-cruising and land-management app developers, log-buyer and timber-valuation tools, and woodlot calculators. Pure local computation — no key, no third-party service, instant. Imperial forestry units. Live, nothing stored. 2 compute endpoints. For sawn-board board feet use a lumber API.

api.oanor.com/logscale-api

Tennis Score API

Tennis scoring maths as an API, computed locally and deterministically — the game, set and match logic a scoring app, umpire tool or tennis league runs on. The game endpoint plays a game from a sequence of who won each point and returns the proper tennis score: points run 0, 15, 30, 40 and then game, but at 40-40 it is Deuce and a player must lead by two — Advantage, then game — so a,a,a,a is 40-0 and a win, while three-all is Deuce; a tiebreak flag scores to seven by two instead (and keeps going at 7-7). The set endpoint reads a set from the games each player has won: a set is taken at six games with a two-game lead, 6-6 triggers a tiebreak that ends it 7-6, and 7-5 wins if a player pulls ahead first. The match endpoint settles the match from the sets won — best-of-three is decided by two sets, best-of-five by three — and tells you the winner the moment it is reached. Everything is computed locally and deterministically, so it is instant and private. Ideal for tennis, racket-sport, scoring, umpiring and league app developers, scoreboard and live-scoring tools, and club software. Pure local computation — no key, no third-party service, instant. Scoring logic, not analytics. Live, nothing stored. 3 compute endpoints.

api.oanor.com/tennis-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Firewood Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Firewood Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Firewood Calculator 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 Firewood Calculator API cost?
Firewood Calculator API has a free tier with 100 calls / month. Paid plans start at €12.55 / 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 Firewood Calculator API GDPR-compliant?
All requests to Firewood Calculator 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.

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

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/firewood-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/firewood-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/firewood-api/SOME_PATH");
curl_setopt($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/firewood-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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