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SAT to ACT Conversion Chart

Convert an SAT score to an ACT score — or an ACT score back to an SAT score — using the official 2018 concordance tables published jointly by the College Board and ACT. These are the tables admissions offices and counselors are expected to use; this page is the whole thing, with nothing retyped by hand.

Use the converter below, read the full chart, or call it as a free JSON API.

The full SAT ⇄ ACT conversion chart

Every published row of the 2018 concordance, both directions. An ACT score maps to a band of SAT scores, so the SAT column shows the midpoint and the range — that band is what you want when comparing a student against a college's published mid-50%. Rows marked * fell outside the concordance study sample and are extrapolated.

SAT total → ACT composite

ACT composite → SAT total

SAT Math → ACT Math

ACT Math → SAT Math

SAT EBRW → ACT English/Reading

ACT English/Reading → SAT EBRW

Free JSON API — no key, no rate limit

The same data, machine-readable. Every valid lookup is a static file on a CDN: no server to rate-limit you, no key to rotate, no cold start. Fetch it from a browser, a spreadsheet, a Lambda, or a student's phone.

Endpoints

Path	Input domain
/v1/sat-to-act/total/{score}.json	400–1600, step 10
/v1/sat-to-act/math/{score}.json	200–800, step 10
/v1/sat-to-act/erw/{score}.json	200–800, step 10
/v1/act-to-sat/composite/{score}.json	1–36
/v1/act-to-sat/math/{score}.json	1–36
/v1/act-to-sat/english-reading/{score}.json	1–36
/v1/tables.json	the entire dataset, one request
/v1/index.json	machine-readable endpoint list

Example

curl https://examstats.surge.sh/v1/sat-to-act/total/1350.json

{
  "input":      { "scale": "SAT total (400-1600)", "total": 1350 },
  "concordant": { "scale": "ACT composite (1-36)", "act": 29 },
  "source":     "2018 ACT/SAT Concordance Tables"
}

Going the other way returns the full band of SAT scores that concord to an ACT score, which is what you want when you are comparing a student against a college's published mid-50%:

{
  "input":      { "scale": "ACT composite (1-36)", "composite": 30 },
  "concordant": { "scale": "SAT total (400-1600)", "total": 1370,
                  "range": [1360, 1380] },
  "source":     "2018 ACT/SAT Concordance Tables"
}

Behaviour you can rely on

Case	Response
Valid score, published mapping	200 with concordant populated
Valid score, below the table (e.g. SAT 400)	200, "concordant": null, plus a note — never a 404, so you don't have to tell "bad input" apart from "no published equivalent"
Extrapolated row (starred in the official PDF)	200 with a note warning that the score fell outside the concordance study sample
Score off the scale or not a multiple of 10	404 — round to the nearest 10 first

Use it in two lines

// JavaScript
const r = await fetch(`https://examstats.surge.sh/v1/sat-to-act/total/${sat}.json`);
const { concordant } = await r.json();   // -> { act: 29 }

# Python
import urllib.request, json
u = f"https://examstats.surge.sh/v1/act-to-sat/composite/{act}.json"
data = json.load(urllib.request.urlopen(u))["concordant"]   # -> {"total": 1370, ...}

About the data

Extracted programmatically from the official ACT/College Board concordance PDF — never retyped by hand. The build pipeline checks full key coverage, monotonicity, that the ACT→SAT ranges tile 590–1600 without gaps or overlaps, and spot-checks published rows; it refuses to emit a dataset if any check fails.

These 2018 tables are the current official crosswalk. They concord the current SAT (2016 redesign onward) with the ACT. They are not a concordance for the pre-2016 SAT.

Download the whole dataset

Every published mapping, flattened into one long-format table — six crosswalks, both directions, with the SAT bands and the extrapolation flags intact. Same build, same validation as the API.

File	What it is
concordance.csv	Long format, one row per mapping — drops straight into Excel, Sheets, pandas or R
concordance.sqlite	Indexed SQLite database, ready to ship inside an app that has to work offline
tables.json	The nested source-of-truth JSON

Using this commercially

What's next

Percentile ranks and a superscore endpoint are the next datasets, built through the same validated pipeline. Want one of those, or a dataset added? Tell me what you need.