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API · /gradecalc-api

Grade Calculator API

healthy 4,933 Subscribers

Single-course grade maths as an API, computed locally and deterministically — the everyday "what do I need on the final" student calculations. The needed endpoint works out the score required on the final exam (or any remaining component) to reach a target overall grade, from the current grade and the weight the final carries, and flags whether the target is achievable or already secured. The projected endpoint gives the overall grade you would finish with for a hypothetical final score. The average endpoint computes the weighted average of graded components from a simple score:weight list (such as 90:40,80:60), and reports the total and remaining weight so you can see how much of the course is still ungraded. Percentages run 0–100 and weights accept either a percentage (30) or a fraction (0.3). Everything is computed locally and deterministically, so it is instant and private. Ideal for student and study apps, learning-management tools, and tutoring and education sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is single-course grade mechanics; for a multi-course grade-point average from credit hours use a GPA API.

#grade #final-exam #education #student #weighted-average #developer-tools
api.oanor.com/gradecalc-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
90 ms
Server probes · 24h
Subscribers
4,933
active
Total calls
40
last 7 days
status Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 11,935 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 11,935 calls/month
  • 2 req/sec
  • Needed + projected + average
  • No credit card
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Starter

€13.45 /month

  • 21,550 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 21.55k calls/month
  • 8 req/sec
  • Weighted components
  • Email support
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Pro

€33.35 /month

  • 265,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 265.5k calls/month
  • 20 req/sec
  • Education / LMS pipelines
  • Priority support
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Mega

€71.35 /month

  • 1,370,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.37M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Slope & Grade API

Slope and grade maths as an API, computed locally and deterministically. The convert endpoint converts a slope between every common form — percent grade, angle in degrees, a ratio such as 1:12, per mille and rise-per-run — where the slope m = rise ÷ run = tan(angle). The distance endpoint relates the run (horizontal), the rise (vertical) and the slope distance (the hypotenuse) of a right-triangle slope: give any two, optionally with the grade or angle, and it returns the rest. The ramp endpoint sizes a wheelchair or ADA ramp — from a rise and a maximum slope (defaulting to 1:12, the ADA maximum of 8.33%) it returns the required run and total ramp length, and if you supply an actual run it checks whether the ramp is within the limit. Everything is computed locally and deterministically, so it is instant and private. Ideal for civil-engineering and surveying tools, road, trail and accessibility apps, construction and ramp design, and mapping software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is slope and grade geometry; for roof pitch specifically use a roofing API.

api.oanor.com/slope-api

GPA API

Calculate a weighted grade-point average (GPA). The calc endpoint takes a list of courses — each with a grade and the credit hours it is worth — and returns the credit-weighted GPA, the totals, and a per-course breakdown of quality points so you can see exactly how the average was formed. Grades may be US letter grades (A, A-, B+, … F) on the standard 4.0 scale, or 4.3 with the us_plus scale that gives A+ extra weight; percentages from 0 to 100 mapped to letters and points with the usual cutoffs; raw grade points given directly as numbers; or your own custom letter-to-point mapping for any institution's scheme. Courses can be passed as a JSON array or a compact string like "A:3,B+:4,C:2", and credits default to 1 for an unweighted average. The scales endpoint lists the built-in grade scales and their point values. Everything is computed locally and deterministically, so it is instant and private — no student data is stored. Ideal for student planners and dashboards, university and school portals, LMS and ed-tech apps, scholarship and admissions tools, and academic what-if calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This computes GPA; for general statistics use a statistics API.

api.oanor.com/gpa-api

Classical Music API

The classical-music repertoire as an API — powered by Open Opus, an open catalogue of classical composers and their works. Search composers by name or browse them by musical epoch (Medieval, Renaissance, Baroque, Classical, Romantic and beyond), getting each composer's full name, epoch and birth/death years; then list a composer's works, optionally filtered by genre — orchestral, chamber, keyboard, stage, vocal or opera. From Bach and Mozart to Beethoven's 44 orchestral works, it turns the canon of classical music into a clean search-and-browse API. A classical-music repertoire reference — distinct from commercial music catalogues of tracks, artists and albums. Ideal for classical-music, education, concert-programming, streaming and media applications. Open data from Open Opus (CC-BY-SA / CC0).

api.oanor.com/classical-api

Example Sentences API

Real example sentences with human translations as an API — powered by Tatoeba, the large collaborative corpus of millions of sentences in hundreds of languages, each linked to translations contributed and reviewed by real people (not machine translation). Search for sentences containing a word or phrase in one language and get how they are actually translated into another — perfect for seeing a word "in the wild", building vocabulary and flashcards, or as a human-quality translation aid. Look up any sentence by id to get its full set of translations. From "good morning" in English to its German, French, Spanish, Japanese or Mandarin equivalents, across ISO-639-3 languages, it is ideal for language-learning, vocabulary, flashcard, dictionary-companion and linguistics applications. A human-translated example-sentence corpus — distinct from dictionaries (definitions), machine translation and word APIs. Open data from Tatoeba (CC-BY 2.0 FR / CC0).

api.oanor.com/tatoeba-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Grade Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Grade Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Grade 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 Grade Calculator API cost?
Grade Calculator API has a free tier with 100 calls / month. Paid plans start at €13.45 / 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 Grade Calculator API GDPR-compliant?
All requests to Grade 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/gradecalc-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/gradecalc-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/gradecalc-api/SOME_PATH");
curl_setopt($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/gradecalc-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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