Compare soprano vs alto side by side, from range and tone to the choir parts each one sings, then sing into your mic to see which range your voice fits better. Free, no sign-up, right in your browser.
Quick reference
The two voices share more than an octave, from middle C to F5. What separates them is where each one is comfortable, how it sounds and what it does in a choir.
| Feature | Soprano | Alto |
|---|---|---|
| Typical range | C4 – C6 | F3 – F5 |
| Frequency | 262 – 1,047 Hz | 175 – 698 Hz |
| Comfort zone | About F4 – G5 | About G3 – C5 |
| Upper register shift | Around F#5 | Around D5 |
| Tone color | Bright, light, ringing | Dark, warm, full |
| Choir role | Usually the melody | Inner harmony below the melody |
| Classic solo roles | Mimì, Pamina, Christine | Erda, Ulrica, Messiah alto arias |
Alto is strictly a choir part; the matching solo voice type is contralto. Many women who sing alto in a choir are mezzo-sopranos, the voice type between the two. Ranges are commonly cited classical figures; C4 is middle C.
How it works
You do not need a piano or a teacher to get a good first answer. You need your range, your lowest steady note and one simple hymn.
Step 1
Warm up for two minutes, press Start and sing from a comfortable low note to your highest clean one, holding each for about two seconds. The result gives a match for soprano, alto and mezzo-soprano. Choose 'Compare as: Female' to rank only the women's types.
Step 2
Your bottom note is the most telling number, because it changes little with training. A steady, clear F3 or G3 points to alto. If your voice fades to a whisper somewhere around A3 to C4, soprano or mezzo is more likely.
Step 3
Take a simple four-part hymn and sing the top line, then the second line. Whichever you can sing through three verses without tiring or straining is your part, at least for now. A choir director can confirm it in a two-minute voice check.
Highlights
Range overlaps, so listen for these clues as well. Two or three of them pointing the same way is a fairly reliable answer.
Notes around E5 to G5 feel easy and bright, your notes below A3 turn breathy or quiet, and your voice shifts into head voice high, around F#5. People may describe your voice as light, clear or sweet, and the melody line feels natural to you.
Your voice sounds warm and strong from G3 to C5, chest voice carries up to about G4 without effort, and long passages above D5 tire you quickly. Harmony comes naturally, and you may already find yourself drifting to the line under the melody.
If both lines feel fine, you may be a mezzo-soprano, the most common female voice type. Mezzos often sing soprano 2 or alto 1. In the test this shows up as similar bars for soprano, mezzo and alto; our mezzo-soprano vs alto guide helps you decide.
Quick reference
SATB stands for soprano, alto, tenor and bass, the four parts of a standard mixed choir. Each choir part sits inside the full solo range of its voice type.
| Part | Solo voice range | Typical choir part | Role in the harmony |
|---|---|---|---|
| Soprano | C4 – C6 | About C4 – G5 (A5) | Melody, the top line |
| Alto | F3 – F5 | About G3 – C5 (D5) | Inner harmony under the melody |
| Tenor | C3 – C5 | About C3 – G4 (A4) | Inner harmony, the upper men's line |
| Bass | E2 – E4 | About F2 – C4 (D4) | Foundation and chord roots |
Tenor parts are usually written in treble clef an octave above where they sound. Mezzo-sopranos and baritones have no part of their own in SATB, so they join whichever line suits them. Choir part limits vary by piece and arranger. The vocal range chart shows all seven voice types together.
Choir directors usually place singers with a short voice check: a few scales, a high note, a low note, sometimes a line of a hymn. They listen for range, but also for tone and for how easily you hold a harmony line against the melody. The final call often depends on balance; a choir with 30 sopranos and 8 altos will ask its mezzos to sing alto.
That means your choir part and your voice type are not always the same thing. Plenty of mezzo-sopranos sing alto for years, and some altos discover a free top later and move up. If your part feels like a constant strain, ask to try the other line for a few rehearsals. A part that suits you should only feel tiring at its extremes.
Teens should expect to move. Girls' voices deepen by a few semitones and gain color through the teenage years, so a 13-year-old soprano may be a comfortable alto at 18. The reverse happens too, as head voice develops and the top gets easier.
Sopranos usually need to strengthen the middle and lower notes, which can sound thin next to the altos and men. Altos usually need a freer top and good tuning on inner harmony notes, where it is easy to drift toward the melody. Whichever side of the soprano vs alto line you land on, the same daily habits help.
Last updated October 21, 2026
FAQ
Quick answers about the two female choir parts and how to choose between them.
Still have a question?
The quickest way to find out is to try it yourself. It only takes a minute.
Sing one slow slide from your lowest note to your highest and see your soprano, mezzo and alto matches side by side. Free, no sign-up, nothing uploaded.
