What is the 1-1-1 doubling rule?

If a word has one syllable, one vowel and one consonant at the end, double that last consonant before adding a suffix that starts with a vowel. Hop becomes hopping and big becomes bigger.

When do you not double the consonant?

Do not double when the word ends in two consonants (jump, jumping), has two vowels before the last consonant (rain, rained), or ends in w, x or y (snowing, boxing, playing).

Do you double the consonant in two-syllable words?

Only when the stress falls on the last syllable. Begin becomes beginning, but visit becomes visiting.

What is the drop the e rule?

When a word ends in a silent e, drop the e before adding a suffix that starts with a vowel. Make becomes making and hope becomes hoping. Keep the e before a suffix that starts with a consonant, as in hopeful.

The 1-1-1 Doubling Rule: When to Double the Consonant

By Kids Learning editorial team · Updated October 26, 2026

Phonics poster for the 1-1-1 doubling rule with the words hopping, running, stopped, bigger and swimming

Double the last consonant when a one-syllable word has one vowel and ends in one consonant, and the suffix starts with a vowel. That is the 1-1-1 rule: one syllable, one vowel, one final consonant. It explains hop → hopping, run → running, big → bigger and stop → stopped. This how-to shows how to apply the rule in four checks, what changes for two-syllable words, and how it pairs with the drop-the-silent-e rule.

The four checks

Before adding -ing, -ed, -er or -est to a word, run these checks in order.

Does the suffix start with a vowel? -ing, -ed, -er, -est and -y all do. If not (-ful, -ly, -ness), do not double.
Does the base word have one syllable? (If not, see the two-syllable section below.)
Does it have one vowel? Rain has two vowel letters, so it does not double.
Does it end in exactly one consonant? Jump ends in two. Hop ends in one.

If all four checks pass, double the last letter.

Word	Checks	Result
hop + ing	1 syllable, 1 vowel, 1 final consonant	hopping
big + er	passes	bigger
swim + ing	passes	swimming
jump + ing	ends in two consonants	jumping
rain + ed	two vowels	rained
help + ing	ends in two consonants	helping

Why doubling happens

The doubled consonant protects the short vowel. Hoping (long o) and hopping (short o) are different words, and the double p is what tells you which one you are reading. This is the same logic as the silent e: one signals a long vowel, the other protects a short one. See the magic e guide for the long-vowel side.

Letters that never double

Three letters do not double, even when the other checks pass:

w: snow → snowing, show → showing.
x: box → boxing, fix → fixing.
y: play → playing, stay → stayed.

These are the honest exceptions, and they are easy to teach, because the letters are few.

Two-syllable words: look at the stress

The rule extends to longer words with one extra check: double the final consonant only if the stress is on the last syllable.

Word	Stress	Result
begin	be-GIN (last syllable)	beginning
forget	for-GET (last syllable)	forgetting
admit	ad-MIT (last syllable)	admitted
prefer	pre-FER (last syllable)	preferred
visit	VIS-it (first syllable)	visiting
open	O-pen (first syllable)	opening
listen	LIS-ten (first syllable)	listening

To find the stress, say the word aloud and notice which syllable is louder and longer. Clap it if you need to. Then apply the same four checks to the last syllable.

Some word forms are British or American variants (traveling versus travelling). Choose one and stay with it.

The drop-the-silent-e rule

The doubling rule has a partner. When a word ends in a silent e, drop the e before a suffix that starts with a vowel, and keep it before a suffix that starts with a consonant.

Base	Suffix	Result	Why
make	-ing	making	drop e before a vowel suffix
hope	-ed	hoped	drop e
ride	-er	rider	drop e
hope	-ful	hopeful	keep e before a consonant suffix
safe	-ly	safely	keep e

Exceptions include noticeable and courageous (the e stays to keep c and g soft) and dyeing (to keep it apart from dying).

Putting both rules together

When a child writes hoping or hopping, the spelling shows the vowel sound. Ask the child to say the word slowly and decide: long o or short o? Long o means a silent e was dropped (hoping). Short o means the consonant was doubled (hopping). That is one of the most useful checks in beginning spelling.

A quick routine

Write a base word on the board (run).
Ask: does the suffix start with a vowel? (-ing: yes.)
Say the four checks out loud as a class.
Add the suffix and read the new word.
Write a sentence: "The dog was running in the sun."

Practice with a basket of ten base words and three suffixes. Kids who can explain why a word doubles or does not are using the rule, not just memorizing words. For a map of how this rule connects to others, see the list of spelling rules, and for how to split long words, see the syllable division guide.

Interactive notebook page for one phonics rule, with a word sort, missing letters and a sentence to copy

Posters for the doubling rules

Phonics & Spelling Rules Posters includes three posters for this topic: the 1-1-1 doubling rule, the doubling rule for two-syllable words, and the drop-the-silent-e rule. Each has a plain-language rule, six example words, a contrast and a decodable sentence. They belong to the full set of 130 posters, in color and black & white, in full-page, half-page and mini sizes.