What reading grade level measures
A reading grade level is a score, usually a U.S. school grade, that estimates how much education a reader needs to understand a text. Formulas like Flesch-Kincaid count syllables, words, and sentences to estimate difficulty. A score of 8 means an eighth-grader could follow it. The number is a proxy, not a verdict on intelligence — it simply predicts how much friction the words create.
The formulas are older than most people assume. Flesch published his Reading Ease formula in 1948; the Navy commissioned the grade-level variant in 1975 to standardize its technical manuals. That pedigree is worth remembering: these formulas were built for comprehension under pressure, not literary quality.
The two levers the formulas actually measure
Every common readability formula reduces a text to the same two inputs:
- Sentence length. Flesch-Kincaid Grade Level is literally 0.39 × (average words per sentence) + 11.8 × (average syllables per word) − 15.59. The sentence-length term dominates: twenty extra words per sentence adds almost eight grade levels.
- Word length or familiarity. The formulas approximate "hard word" with syllable counts — SMOG counts words of three or more syllables, Gunning Fog does the same, Flesch-Kincaid uses syllables per word.
Neither formula knows anything about meaning. "Television" is four syllables and familiar to every eight-year-old; "use" is one syllable and never confuses anyone. So the score is a smoke detector, not a fire report — it tells you where to look, not exactly what to change. But the editing works: shorten sentences and cut heavy words, and comprehension genuinely improves, even where the syllable proxy was crude.
Why a lower score reaches more people
Most web readers skim and most are not reading in their first language. A lower grade level lets more people finish your sentence on the first pass, which means more of them act, share, or come back. Lowering it is not about writing for children; it is about removing unnecessary load so the idea lands. Clarity is a courtesy, and courtesy converts.
The research consensus here is unusually settled. Health-communication bodies, including the American Medical Association and NIH institutes, have recommended for years that patient-facing materials be written around a sixth-grade level, because studies going back to the early 1990s linked low health literacy to worse outcomes — missed appointments, medication errors, poorer disease control. Nobody is claiming patients are unintelligent; the claim is that reading capacity drops under stress, and a diagnosis is stressful. The same logic applies to your refund policy, your onboarding email, and your donation page.
When to reduce it
- Public-facing pages where the reader is broad and impatient.
- Instructions and FAQs where a misread costs support time.
- Nonprofit and government comms serving diverse readers — this is a legal obligation in some contexts, covered below.
- Health, safety, and financial materials where a misread has real consequences.
- Product copy where the buyer decides in seconds.
- Any draft that tested high but needs to reach everyone.
How to reduce it well
Shorten sentences so each carries one idea. Swap long words for short ones that mean the same thing — "use" beats "utilize". Cut filler like "in order to" and "it should be noted that". Prefer the active voice so the doer comes first. Then re-read aloud; if you trip, the sentence is still too dense. The goal is not tiny words but unblocked meaning.
That paragraph is the summary. Here is the craft underneath it.
Sentence surgery: one idea per sentence
Pick up any dense sentence and count the ideas inside it. Most grade-14 prose is not made of hard words — it is made of three or four ideas welded into one sentence with relative clauses. The fix is mechanical: find the natural break points, split, and let each sentence carry exactly one idea. It is why "fix sentences first" comes before any word swap in the workflow below.
Watch the rhythm while you do it. If every sentence lands at nine words, the prose drones like a metronome. Vary lengths deliberately: a short sentence after two medium ones gets attention, which is exactly where your key point belongs.
Convert nominalizations back into verbs
A nominalization is a verb wearing a noun costume: "make a decision" instead of "decide", "conduct an analysis of" instead of "analyze", "provide assistance to" instead of "help". Bureaucratic prose runs on these because they sound official. They also inflate sentence length, hide the actor, and push every readability number up. The rewrite rule: find the buried verb — usually the last word of the noun phrase — and rebuild the sentence around it. "The implementation of the policy was completed by the team" becomes "The team implemented the policy." Shorter, clearer, and the doer finally stands in front.
Replace jargon — or define it in place
When a technical term has a plain equivalent, swap it: "prior to" becomes "before", "utilize" becomes "use", "commence" becomes "start". When the term has no honest equivalent — a medical name, a legal term of art, a product concept — do not delete it; define it in place. The plainlanguage.gov guidance is explicit about this pattern: introduce the term, define it in one short clause, then use it consistently. "Metabolism — how your body turns food into energy — slows with some medicines." The reader learns the real word instead of a vague substitute, which matters when they need to discuss it with a pharmacist.
Read aloud: the cheapest detector in writing
Reading aloud catches what the formula cannot: the sentence you stumble over, the phrase you have to re-breathe halfway, the paragraph that leaves you no place to pause. It costs nothing and takes a minute per paragraph. If you find yourself re-reading your own sentence, a first-time reader has no chance. This is the insider habit that separates a genuine clarity pass from a cosmetic one.
A step-by-step method
- Measure the baseline with a readability tool so you know the starting grade and the metrics behind it.
- Fix sentences first — split long ones at natural breaks, one idea each. This alone often moves the score several grades.
- Fix jargon second — swap plain equivalents, define unavoidable terms in place, convert nominalizations to verbs.
- Delete filler — "in order to", "it should be noted that", "at this point in time" — and switch to active voice where it reads clearer.
- Re-measure and repeat until you hit the target range for your audience.
- Read the final draft aloud before shipping. The score is the estimate; your ear is the verdict.
The order matters. Writers who start by hunting long words polish syllables while the fourteen-idea sentence sits untouched.
A worked example
Real before-and-after rewrites, with the editing move named:
- Filler and jargon swap. "Utilize the following methodology in order to facilitate optimal outcomes." becomes "Use this method to get better results." Nine words down to seven, four heavy words to zero, meaning identical.
- Nominalization reversal. "It should be noted that implementation of the aforementioned policy modifications will necessitate a comprehensive review." becomes "We will review the new policy carefully." The actor appears, the bureaucratic padding disappears, and the grade level collapses.
- Sentence split. "Customers who have received a notification that their subscription payment failed and who have not updated their payment information within seven days will lose access to their account, which will remain inaccessible until the balance is cleared." becomes "Did your subscription payment fail? Update your payment information within seven days. Otherwise we have to pause your account until the balance is cleared."
Same information in all three cases. That is the discipline: nothing is lost except friction.
Common formulas compared
- Flesch-Kincaid Grade Level — sentence length plus syllables per word; outputs a U.S. school grade. The default in Word and most tools.
- Flesch Reading Ease — the 1948 original; outputs a 0–100 score where higher is easier, and 60–70 reads as plain English. Several U.S. states write the score into insurance regulations, requiring policies to meet a minimum ease threshold — one of the few places a readability formula has force of law.
- SMOG — G. Harry McLaughlin's 1969 formula; counts polysyllabic words in a sample of sentences. Preferred in much health writing because it was validated against actual reader comprehension.
- Gunning Fog — sentence length plus the share of words with three or more syllables.
They can disagree by one to three grades on the same text because they weight the two levers differently. Do not chase agreement. Pick one formula, track it over time, and treat the trend as the signal.
A quick scenario: a nonprofit communicator
A nonprofit sends a grant update full of phrases like "leverage synergies" and "facilitate outcomes". Readers donate less because they cannot tell what happened. The communicator runs the draft through a readability tool, sees a grade 14, and rewrites in plain language. The next update reads at grade 7, donations tick up, and the team learns that clarity is part of the mission, not a distraction from it.
The habit sticks. Every public message gets a quick readability pass before it ships, and the organization's voice becomes trusted because people actually understand it. Lower grade level becomes a default, not a one-time fix.
Two details make the habit durable in organizations like this. First, the target is written into the style guide as a range — "grade 6–8 for public materials" — so nobody relitigates it per newsletter. Second, the pass happens on the template: recurring sections get rewritten once and reused, so each new draft starts closer to the target.
Common mistakes
- Chasing the number by chopping words until the sentence is broken. Clarity, not a score, is the aim — a fragment is not a short sentence.
- Replacing every long word and stripping the voice until it reads like a robot. Vary sentence length; keep one distinctive phrase per paragraph.
- Making every sentence the same length. Uniform prose scores fine and reads terribly.
- Ignoring the reader's actual expertise. A specialist audience can handle more — writing grade 5 copy for engineers talks down and wastes their time.
- Cutting necessary precision. Do not replace a defined legal term with an approximate plain phrase in a contract; define it instead.
- Testing only the first draft. The loop is measure, edit, re-measure — a single pass rarely lands in range.
Who should use it (and who shouldn't)
Reduce grade level for general, public, or action-driving copy where reach matters. The plain-language movement has institutional weight behind it now: the U.S. Plain Writing Act of 2010 required federal agencies to write public documents in plain language, and plainlanguage.gov maintains the Federal Plain Language Guidelines that agencies and nonprofits borrow from. If government forms can do it, your pricing page can.
But match the grade to the audience — do not chase the lowest possible number. Legal and technical precision has limits: a contract's defined terms, a drug's contraindications, an API's error semantics cannot be paraphrased away without lying. For specialist readers, density is expected and respected; a grade-12 white paper for surgeons is correct, not a failure. Write to the reader on the other side, then trim the friction that serves no one.
How it fits a writing toolkit
Glint's readability analyzer reports the grade level and the metrics behind it, and the word counter confirms length. Together they turn "make it simpler" into a measurable loop you can repeat on every draft. Both run free in your browser with no account.
For the theory behind the score, see the free readability checker and the roundup of best reading ease analyzer tools. The sister guide on improving your reading ease score covers the formula side of the same problem, and the word counter handles length checks as you split sentences.
Frequently asked questions
Is lowering grade level dumbing down? No. It removes friction; the ideas stay as complex as they need to be.
What grade level should I target? Aim for 6 to 8 for general audiences, higher for specialist readers.
Does short sentences always help? Mostly, but vary them so the text does not read like a robot.
Which formula should I trust? They disagree slightly; track one over time rather than chasing a single number.
Is the Glint analyzer free with no signup? Yes. It runs in your browser and needs no account or upload.