Chord Progression Calculator — Build Progressions in Any Key

Songwriting often stalls not on melody or lyrics but on harmony. What chords go together? Why does this progression feel happy and that one melancholy? The chord progression calculator takes the guesswork out and shows you all the chords that naturally belong to any key.

Explore progressions in any key at CalcHub.

Diatonic Chords: The Palette for Any Key

Every major key has 7 diatonic chords — one built on each scale degree. These chords use only the notes in the key, so they naturally sound cohesive when combined.

Diatonic Chords in C Major

Numeral	Chord	Type	Feel
I	C major	Major	Home, resolved
ii	D minor	Minor	Gentle tension
iii	E minor	Minor	Ambiguous, dreamy
IV	F major	Major	Open, uplifting
V	G major	Major	Tension, wants to resolve to I
vi	A minor	Minor	Melancholy, emotional
vii°	B diminished	Diminished	Unstable, dramatic

How to Use the Calculator

1. Select your key (major or minor)
2. The calculator shows all diatonic chords with their numerals and types
3. Build progressions by selecting chord numerals in order
4. See the actual chord names for your chosen key

The CalcHub calculator also transposes any standard progression to any key instantly — enter the Roman numeral pattern, select target key, get chord names.

Essential Progressions and Where You've Heard Them

I-IV-V-I — The most common progression in Western music. Countless blues, rock, and country songs. In C: C - F - G - C. I-V-vi-IV — Pop's favorite. Used in thousands of hits across every decade. In C: C - G - Am - F. "Let It Be," "No Woman No Cry," "Don't Stop Believin'" (roughly). ii-V-I — The cornerstone of jazz harmony. Creates smooth voice leading and strong resolution. In C: Dm7 - G7 - Cmaj7. I-vi-IV-V — The "50s progression," heard in doo-wop, early rock and roll. In C: C - Am - F - G. vi-IV-I-V — The "emotional minor feel in a major key" progression. In C: Am - F - C - G. Widely used in modern pop for verses.

Minor Key Progressions

Natural minor uses the same diatonic structure but starting from the vi chord. In A minor:

Numeral	Chord
i	Am
ii°	B diminished
III	C major
iv	D minor
v	E minor
VI	F major
VII	G major

The harmonic minor scale raises the 7th degree, giving you a major V chord (E major instead of E minor) — creating stronger resolution back to i. The progression i-iv-V-i in A minor: Am - Dm - E - Am.

Why do some chords outside the key still work?

Borrowed chords come from the parallel minor or other modes. The bVII chord (in C major: Bb major) is borrowed from C Mixolydian. The iv chord (Fm in C major) is borrowed from C minor. These create color and emotional contrast without leaving the gravitational pull of the home key.

What is a "secondary dominant"?

A secondary dominant is a V chord that resolves to a chord other than I. In C major, D7 (V of V) creates tension that wants to resolve to G. E7 (V of vi) resolves to Am. Secondary dominants borrow from other keys momentarily, adding harmonic richness to otherwise diatonic progressions.

How do modal progressions differ from major/minor?

Modal progressions avoid the strong pull toward a tonic chord that characterizes major/minor harmony. Dorian (the ii mode) and Mixolydian (the V mode) are common in rock and folk — they have a flatter, more ambiguous feel because they lack the leading tone that creates strong resolution. Santana's "Oye Como Va" and "So What" by Miles Davis are classic Dorian examples.

Related Calculators

• Key Transposer Calculator — move any progression to a new key
• Interval Calculator — understand the intervals that build each chord
• BPM Calculator — set the right tempo for your progression