spelled and spelt - the difference

The Quick Answer

If you're following US writing conventions, use spelled.
If you're following UK writing conventions, use spelt.

(If you're referring to the wheat, use spelt.)

Spelled and Spelt

The verb to spell most commonly means to write or name the letters that form a word in correct sequence.

To spell is one of those verbs with both an irregular form and a regular form. (See the table below for some others.) The past tense and the past participle can be written as either spelled or spelt. However, they are not interchangeable, especially in the US.

Americans Demand Spelled

In America, spelled dominates. The use of spelt as the past tense or past participle of to spell is considered a spelling mistake by many. It will certainly annoy a fair proportion of your readers.

Brits Prefer Spelt

Outside America, spelt is more common, but spelled is generally accepted. (This is almost certainly a result of American influence spreading.)

Misspelled and Misspelt

It's the same with misspelled and misspelt. Americans demand misspelled (and Brits will accept it). However, Brits prefer misspelt.

Verbs with Irregular and Regular Forms

The following verbs (like to spell) can be regular or irregular:

Verb	Past Simple	Past Participle
burn	burned OR burnt	burned OR burnt
dream	dreamed OR dreamt	dreamed OR dreamt
learn	learned OR learnt	learned OR learnt
hang	hung also hanged	hung also hanged
smell	smelled OR smelt	smelled OR smelt
spell	spelled OR spelt	spelled OR spelt