5.2 One-Length & Graduated Shapes

One-Length (Blunt) Cut

A one-length cut — also called a blunt cut or solid form — is produced at 0° elevation. Hair is held at its natural fall and cut to a single length, so all the weight settles at the bottom line. The result is a clean, solid edge best suited to straight or gently wavy hair; on curly hair the bottom line tends to triangle and lose its sharp edge.

Characteristics

• Elevation: 0° (natural fall).
• Weight: concentrated at the bottom perimeter.
• Cutting line: horizontal for a classic blunt bob, diagonal for a soft one-length.
• Best hair type: straight to slightly wavy, medium density.
• Worst hair type: very curly or coily (bottom fans out), very fine (looks thin at the line).

The A-Line Bob Variation

An A-line bob is a one-length variation cut with slight forward elevation in the back sections. The back is cut shorter and the front left longer, producing a silhouette that lengthens toward the face — the shape of the letter A from the side. The over-direction is subtle (a few degrees), so the back still reads as a solid line rather than a true graduation.

Graduation

Graduation uses elevation between 0° and 90° to build a stacked weight curve — shorter at the top of the section and longer at the bottom. The classic graduation angle is 45°, which produces the recognizable graduated bob silhouette with weight sitting at the occipital bone.

Why Graduation Builds Weight

When you elevate a section to 45°, the hair at the top of the section is cut shorter than the hair at the bottom. As each subsequent section is cut to a travelling guide, the shorter top lengths stack on top of the longer bottom lengths, accumulating weight at the curve of the head. The lower the elevation (closer to 0°), the lower the weight sits; the higher (closer to 90°), the higher the weight rises and the more it blends into layering.

graph LR
    A[0° elevation] --> B[Weight at bottom line]
    B --> C[One-length / solid form]
    D[45° elevation] --> E[Stacked weight curve]
    E --> F[Classic graduation]
    G[90° elevation] --> H[Weight removed]
    H --> I[Layering]

One-Length vs Graduation at a Glance

Sectioning and Comb Control

One-Length Sectioning

1. Take a centre parting from forehead to nape.
2. Section a nape guide about 1 cm deep, cut to the desired length.
3. Work up the back in horizontal sections, each brought down to the stationary nape guide and cut.
4. Move to the sides, bringing each section back to the back guide.

Graduation Sectioning

1. Begin with the same nape guide.
2. Take the next section above it and elevate to 45°, cut to the travelling guide (the previous section's length).
3. Continue up the back; each section is elevated 45° and cut to the section below it.
4. The weight stack builds at the occipital bone.

Comb Control

• Comb each section twice before cutting — once to align, once to confirm even tension.
• Hold the section between the index and middle fingers of the non-cutting hand, fingers parallel to the cutting line.
• Cut on the closed side of the fingers so the section does not slip.
• Maintain the same finger angle for every section; rotating the hand changes the cutting line.

Cutting Line Direction

The cutting line is the angle of the shears relative to the head.

• Horizontal cutting line → blunt, solid edge (one-length, classic bob).
• Diagonal cutting line → soft or stacked edge (A-line, graduated bob, face-framing).
• Vertical (perpendicular) cutting line → used in layering to remove weight, not in one-length or graduation.

Worked Example: Graduated Bob

Here is a complete graduated bob using 45° elevation, a travelling guide, and a diagonal back cutting line.

1. Prep: Clean, towel-dried hair. Section into four quadrants (centre parting + crown-to-ear parting). Leave a 1 cm nape section down.
2. Nape guide: Comb the nape section straight down (0°). Cut a horizontal line at the desired nape length (e.g. 2 cm below the occipital bone).
3. First graduation section: Release the next 1 cm section above the guide. Elevate it to 45°. Align it with the nape guide (travelling) and cut diagonally, following the head curve.
4. Continue up the back: Each 1 cm section is elevated to 45° and cut to the section immediately below. The stack builds at the occipital bone.
5. Sides: Release side sections. Elevate to 45°, over-direct slightly forward, cut to the back guide. The forward over-direction gives the A-line length toward the face.
6. Top and fringe: Release the top. Elevate to 45°, cut to the side guide. The fringe is the last section, cut to the desired length with a slight diagonal.
7. Cross-check: Comb the cut against its natural direction and check for any long hairs; trim them.

Common Faults

• Dropping elevation mid-cut → weight falls lower than planned; the back reads as one-length, not graduated.
• Switching guide type → if the back used a stationary guide but the sides use a travelling guide, the sides will be shorter than the back, breaking the silhouette.
• Inconsistent tension → uneven line in the nape, the most visible area.
• Cutting the nape guide too short → the whole cut is built on that length; there is no way to add it back without starting over.