Suzanne Williamson, RD
Founder of Frugal Organic Mama. My first dozen sourdough loaves had one of two scoring problems: the blade dragged and deflated the dough, or the cut was too shallow and sealed shut in the oven. Both are fixable. Here's what actually changed my results.
🍞 Scoring changes with hydration level.
Higher hydration doughs are stickier and harder to score — the calculator helps you understand what your dough percentage means for handling.
For the first several months I made sourdough, I used a sharp chef's knife to score. The loaves came out okay. Sometimes the score opened nicely. Sometimes it sealed shut. Sometimes the blade caught and deflated half the loaf before it got into the oven.
I assumed this was a skill problem — that I needed better technique. It wasn't. It was a tool problem. The day I switched to a proper lame with a razor blade, my scoring success rate went from about 50% to close to 90% immediately. Technique matters, but the right tool is the prerequisite.
This guide covers both.
What Scoring Actually Does
Most guides present scoring as aesthetic — the beautiful patterns you see on bakery loaves. That's secondary. The functional purpose is more important.
When a shaped loaf goes into a hot oven, several things happen simultaneously in the first 10–15 minutes:
Yeast activity surges as temperature rises toward the yeast's kill point (~140°F). CO₂ production spikes.
Water converts to steam inside the dough, expanding rapidly.
The crust begins to set from the outside in as the surface dries and proteins coagulate.
This creates a race: the interior is expanding dramatically while the exterior is hardening. The expanding gases need to escape somewhere. Without a score, they find the weakest point in the crust — typically the junction between the bottom and side, or wherever surface tension is lowest — and burst through it.
A score creates a deliberate weak point. The expansion happens there, in the direction the baker controls, producing the upward push that opens the crumb and creates the characteristic ear rather than a random sideways blowout.
The difference in final loaf structure is real and significant. A properly scored loaf has more even crumb because the expansion was controlled. An unscored loaf often has dense areas adjacent to wherever it burst, because that area didn't participate in the oven spring.
The Tool Problem (Most Common Cause of Failure)
A standard kitchen knife — even a sharp one — is 1–3mm thick at the cutting edge. When you press that into dough, it displaces the dough sideways before it cuts. On a properly proofed loaf, this displacement compresses the gas structure and can partially deflate the loaf before you've made a clean cut.
A razor blade is 0.1–0.2mm thick. It cuts before it displaces. You feel the difference immediately — a razor blade moves through dough with almost no resistance.
The lame: A bread lame (rhymes with "balm," from French) is a handle that holds a razor blade at a controlled angle. You can find them for $8–20 at kitchen supply stores or online. The curved blade variants (the blade bowed outward) are specifically designed to produce a pronounced ear on a single-slash score.
Alternatives that work:
- Single-edge razor blade held directly (wrap the non-cutting end in tape for grip)
- Very sharp thin paring knife — serrations actually help because they create a sawing action rather than pushing
Alternatives that don't work well:
- Standard chef's knife (too thick)
- Bread knife with large serrations (tears rather than cuts)
- Scissors (produces a different effect — used intentionally for some patterns, but not for standard scoring)
Keeping the blade sharp: Razor blades dull faster than you'd expect on sticky dough. Replace the blade every 3–5 uses. A dull razor blade is almost as bad as using a kitchen knife — it drags and deflates. At $0.15–0.30 per blade, there's no reason to push a dull one.
The Four Variables
1. Timing: Score from Cold
Score the loaf immediately before it goes into the oven, while it's cold from the refrigerator.
Cold dough is firmer, holds its shape under the blade, and the surface doesn't stick to the razor as much. Room temperature dough is tacky and tends to grab the blade mid-cut, deflating the loaf or producing a ragged cut.
This is why most sourdough recipes use an overnight cold retard instead of room temperature proofing (shaped loaf in the banneton in the refrigerator): it's not just for flavor development, it also makes scoring dramatically easier.
If you're working with room temperature dough (same-day bake), chill the shaped loaf in the freezer for 15–20 minutes before scoring. Not long enough to freeze, just long enough to firm the surface.
2. Angle: Controls the Ear
30–45 degrees from the dough surface (blade nearly horizontal): produces an ear. The blade cuts under the dough surface at an angle, creating a flap that lifts away from the loaf as it expands. This is the classic sourdough look — the raised, dark-edged flap along the top of the loaf.
90 degrees (vertical): produces an open expansion without a distinct ear. The cut opens symmetrically and the loaf expands upward and outward rather than lifting one side. Used for grid patterns, leaf patterns, and decorative scoring where multiple cuts are made.
I use 30–40 degrees for my main functional cut and 90 degrees for any secondary decorative cuts. The ear forms on the side of the cut away from the blade angle — so if you score from left to right with the blade tilted to the right, the ear rises on the left side.
3. Depth: ¼ to ½ Inch
Too shallow (under ¼ inch): The oven's initial heat seals the cut before the loaf has expanded. The score becomes decorative rather than functional — you can see a faint line but it doesn't open. The loaf then finds its own escape point.
The sensory check for correct depth: when you make the cut, you should see the dough slightly spring open — a few millimeters of gape. If you see nothing, the cut was too shallow.
Too deep (over ½ inch): The structural integrity of the shaped loaf is disrupted. Instead of controlled upward expansion, the loaf splays outward and the crumb flattens. Particularly problematic with high-hydration doughs (75%+) that have less structure to begin with.
The ½ inch target feels deeper than most beginners expect. Don't be timid — a shallow cut is more likely to fail than a deep one within the correct range.
4. Speed: One Confident Motion
Score in one continuous motion without stopping or restarting. A hesitation mid-cut causes the blade to catch and drag. This is a technique point that genuinely improves with repetition — the first 20 scores feel uncertain, the next 20 feel more natural.
I practice the motion before the blade touches the dough: one smooth stroke from start to finish, held at the target angle. Then execute the same motion on the loaf.
If your first attempt catches and drags, don't try to continue the cut — you risk further deflating the loaf. Load it into the oven as-is. The loaf will still bake; it just may burst at an unexpected point. Learn from the result and adjust next time.
Patterns: Start Simple, Add Complexity Later
The Single Slash (Best Starting Point)
One cut, from one end of the oval loaf to the other, slightly off-center (not along the exact midline). Hold the blade at 30–45 degrees, cut in one motion.
This is the highest-reliability scoring pattern. It requires one confident stroke, produces a clear ear when done correctly, and gives you one data point per bake about what's working and what isn't. I made exclusively single-slash scores for about six months before trying anything more complex.
The Cross (For Round Boules)
Two cuts crossing at 90 degrees, both at 90-degree vertical angle. Produces a square expansion pattern. No ear, but the loaf opens symmetrically and looks clean. Good for round boules where a single diagonal slash looks awkward.
The Wheat Stalk
A central spine with angled cuts branching off both sides, like a wheat stalk. All cuts made at 90 degrees. This is a decorative pattern — the functional expansion happens at the longest cut or at the weakest point between cuts. More visually impressive than the single slash, but harder to execute consistently.
The most common mistake with the wheat stalk: the branch cuts are too close together, which weakens the crust structure between them and causes unpredictable expansion.
The Box / Grid
Four cuts forming a square, or a diamond grid pattern over the whole surface. Used for flatter focaccia-style loaves more than tall boules. Each cut is at 90 degrees and relatively shallow.
How Hydration Changes Scoring
High-hydration doughs (75%+) are harder to score cleanly. The dough is stickier and has less structure — the blade catches more easily, and the loaf spreads more than it rises if the cut is too deep.
For high-hydration doughs:
- Use a blade straight from the package (fresh and sharp)
- Score from cold, ideally after a full overnight retard
- Use shallower angle (20–30 degrees) and shallower depth (¼ inch)
- Make the cut faster and more decisive than you think you need to
Lower-hydration doughs (65% and below) are more forgiving — they hold shape better, the blade catches less, and you have more margin for a slightly imperfect cut. If you're struggling with scoring, temporarily drop hydration by 5–10% and see if the results improve. If they do, hydration was part of the problem.
Use the Sourdough Hydration Calculator to understand what your recipe's hydration percentage means for handling and scoring behavior.
What My First Failed Scores Looked Like
Score that sealed shut: Too shallow, and I used a chef's knife that compressed before cutting. The solution was a real lame and more depth.
Score that deflated the loaf: The blade caught mid-cut because I used room temperature dough. Started scoring from cold after that.
Score that produced no ear: Blade at 90 degrees rather than 30–45. Changed the angle.
Score that caused the loaf to spread: Too deep on a 78% hydration loaf. Reduced hydration temporarily to practice, then went back up once the technique was consistent.
Ragged score with multiple restart lines: Blade was dull — about 8 uses old. Replaced it.
Each failure produced one piece of information. After enough failures, the variables became clear enough that the process became reliable rather than hopeful.
Related Reading
- Sourdough Starter from Scratch — Building a reliable starter before you worry about scoring
- Bulk Fermentation Guide — Getting bulk fermentation right is the prerequisite for a loaf worth scoring
- Sourdough Poke Test — How to read your dough before it goes into the oven
- What to Do With Overproofed Sourdough — When the loaf is overproofed, scoring changes too
- Troubleshooting Flat Sourdough — When poor oven spring isn't a scoring problem but a fermentation one
- Cold Proofing vs Room Temperature Proofing — Why cold dough scores better and how temperature affects crust development
