An alto is the lowest standard female voice, singing F3 to F5.
What Is an Alto Voice?
An alto is the lowest of the standard female voice types, sitting below soprano and mezzo-soprano. Alto voices typically sing between F3 and F5, with the strongest tone in the chest and lower middle register.
The term “alto” comes from the Italian altus, meaning “high” — historically it referred to the higher of the two male choral parts. Today, in modern singing, alto refers specifically to the deepest female voice.
If a woman finds her voice most comfortable in the low register, struggles to sing soprano-range notes without strain, and has a darker, richer tone than her peers, she is most likely an alto.
Contralto vs Alto: What’s the Difference?
The terms are often used interchangeably, but they are not the same.
| Alto | Contralto | |
|---|---|---|
| Definition | The lowest standard female voice type used in popular music and choirs | The lowest classical female voice classification, considered a rare subtype |
| Typical Range | F3–F5 | E3–E5 (sometimes lower) |
| Tone | Warm, full, chest-dominant | Dark, weighty, almost masculine resonance |
| Rarity | Common — appears in nearly every choir | Rare — fewer than 5% of trained female voices |
| Example | Most “alto” singers in pop and gospel | Toni Braxton, Annie Lennox, Cher |
The short answer: every contralto is an alto, but not every alto is a contralto. Contralto is the operatic, technically-classified version of the alto voice — heavier, lower, and harder to find.
For a deeper comparison, see our full alto vs contralto breakdown.
What Notes Are in an Alto’s Range?
A typical alto range covers about two octaves, with the most usable notes sitting between G3 and D5.
- Lowest comfortable note: F3 (the F below middle C)
- Tessitura (most natural zone): G3–C5
- Highest comfortable note: F5 (with E5 being the most common upper limit in choral writing)
- Stretch notes: Some altos can push to G5 or descend to E3, though these are not the ideal working range
Choral parts written for alto rarely go above E5, because that’s where the alto’s natural tone starts to thin and where the mezzo-soprano range begins to sound more comfortable.
Is Alto High or Low?
Alto is the low female voice. Among the four standard female voice types — soprano, mezzo-soprano, alto, and contralto — alto sits at the bottom, with only contralto sitting lower in classical classification.
Compared to the average untrained female voice (which centres around the mezzo-soprano range), an alto’s tone sounds noticeably darker and richer in the lower register, and weaker or strained at the top. This is the opposite of a soprano, whose voice naturally brightens and strengthens above the staff.
Alto vs Soprano: Quick Distinction
| Alto | Soprano | |
|---|---|---|
| Position | Low female voice | High female voice |
| Range | F3–F5 | C4–C6 |
| Tone | Warm, dark, chest-rooted | Bright, agile, head-voice-rooted |
| Most comfortable around | A3–C5 | G4–A5 |
If you can sing above C5 with ease and find low notes thin, you’re likely a soprano. If your low notes sound full and your high notes feel strained, you’re likely an alto. For the complete comparison, see alto vs soprano.
Songs Suited to Alto Singers
Songs that sit in the alto range usually stay between G3 and C5, with melodies that don’t climb above E5. Examples that work well for altos include:
- “Stone Cold” — Demi Lovato (alto-friendly verses, mezzo belt in chorus)
- “Royals” — Lorde (sits comfortably in chest-dominated low register)
- “Hometown Glory” — Adele (low verse, controlled rise)
- “I’d Rather Go Blind” — Etta James (classic contralto territory)
- “Black Velvet” — Alannah Myles (deep, smoky alto delivery)
- “Killing Me Softly” — Roberta Flack (sustained alto-range phrasing)
For a fuller curated list, see songs for altos.
How to Know If You’re an Alto
You are likely an alto if:
- Your voice feels strongest around A3–C5
- You struggle to sing notes above E5 without straining
- Low notes feel natural and resonant rather than airy
- Your speaking voice sits lower than most women you know
- In group singing, you instinctively gravitate to the lower harmony
The most reliable way to confirm is to take the free voice type test, which compares your full range and tessitura against the standard voice type benchmarks.
Frequently Asked Questions
Is alto the same as contralto? No. All contraltos are altos, but not all altos are contraltos. Contralto is the rare classical classification for the deepest female voice. Alto is the broader, more common term used in choirs and popular music.
What is the alto voice range in Hz? An alto’s typical F3–F5 range spans roughly 175 Hz to 700 Hz. The most comfortable singing zone sits between approximately 200 Hz and 525 Hz.
Is alto a rare voice type? Alto itself is common — it’s one of the four standard female voice types. Contralto, the operatic subtype, is rare and found in fewer than 5% of trained female singers.
Can altos sing high notes? Altos can typically reach E5 or F5 with training, but their voices lose tonal richness above that point. They are not built to sustain notes in the soprano range.
What’s the difference between alto and mezzo-soprano? Mezzo-soprano sits between soprano and alto. The mezzo’s strongest notes are around C4–A5, while an alto’s strongest notes are around G3–C5. See alto vs mezzo-soprano for full details.