To slice sourdough bread evenly, let the loaf cool completely, halve a round loaf and lay each half cut side down, then saw with a long serrated knife held upright while you watch its spine. The knife you already own is usually fine; what changes the result is the angle you hold it at.
Key takeaways
- Wedge-shaped slices usually mean the blade tilted during the cut, not that the knife is bad. A lean too small to notice at the crust shows up as a clear wedge at the base.
- Halving a round loaf and laying each half cut side down gives you a flat, stable base and a shorter cut, so there is less distance for the blade to drift.
- Standing slightly side-on lets you watch the knife's spine, which shows the angle while the edge is hidden inside the bread.
- Make one trim cut to get a straight face, then fix any slanted slice by adjusting the next cut rather than shaving the loaf again.
- A slicing guide or crank slicer is mostly worth it for people who slice entire loaves on a regular schedule; for a few slices at a time, practiced knife technique usually does the job.
Why Do Sourdough Slices Come Out Uneven or Slanted?
Most uneven slices come from a knife that drifts off vertical during the cut. The blade can look straight from above and still lean; you only see it when the slice falls over as a wedge.
"I just couldn't get a straight and even cut!!" wrote jonhong on The Fresh Loaf. Find your slice in the table and change one thing at a time.
| What the slice looks like | Likely cause | What to change |
|---|---|---|
| Thick at the top, thin at the bottom | The blade leans toward or away from you | Stand side-on so you can see the blade's angle |
| Thick on one side, thin on the other | The knife is angled sideways to the cut face | Sight down the loaf from the end and square the blade to the face before sawing |
| The first slice is much thicker | The loaf end slopes or curves, not the knife | Treat it as a straight trim cut |
| The blade wanders halfway down | Pressing down, or a blade too short for the loaf | Use the full length of the blade and let it saw |
| The last slices lean and wedge | Nothing left to hold steady | Turn the heel on its side |
| Torn crumb | A warm loaf or downward force | Let it cool; saw lightly |
For a sandwich loaf, jj1109 explained the thick first slice on The Fresh Loaf: "most loaf tins aren't square at the end, but slope out a fraction. So your first slice will be thick at the top, and thin at the bottom."
What Do You Need Before You Slice?
A fully cooled loaf, a long serrated knife and a board that does not move. A ruler for marking slices is optional.
- A cool loaf. America's Test Kitchen says to "wait until the loaf is cool, since cooling gives the starches time to set."
- A long serrated knife. ATK recommends a serrated edge "that is at least 9 inches long." If yours is shorter than the loaf is wide, halve the loaf first so the blade reaches across.
- A steady board. A damp towel underneath stops it sliding.
Not sure your knife is up to it? Our comparison explains how to tell if your bread knife is enough.
How Do You Slice a Sourdough Boule Evenly, Step by Step?
Set the loaf so it cannot rock, make one straight trim cut, mark each slice, and saw lightly with the whole blade, checking every slice as you go.
- Cut the loaf in half. CarryOn on the Breadtopia forum: "I first cut the round in half down the middle (and in quarters if it's a large one), then set it cut side down and slice it that way."
- Lay each half on its cut face. The open crumb on the board "gives a stable base," as evnpar put it in the same thread.
- Make the first cut straight. Ignore its thickness; it only needs to leave a flat, vertical face.
- Pick one thickness and mark it. Nick the crust with the knife tip where the next cut starts. A ruler beside the loaf keeps the spacing consistent.
- Set your stance before the first stroke (see the next section).
- Let the blade do the work. ATK: "Take your time and use the full length of the blade in a gentle horizontal sawing motion. Let the weight of the knife work for you and use minimal downward pressure."
- Stand the slice up and look at it. If it tapers, tilt the knife slightly the other way on the next cut.
How Do You Keep the Knife Straight All the Way Down?
Watch the spine of the knife for the whole cut, stand where you can see it, and start where the crust gives the blade a grip, often the bottom of the loaf.
Watch the spine. jj1109 on The Fresh Loaf notes that keeping the knife straight takes concentration the whole way down.
Try standing side-on. The same baker wrote: "I find if I stand straight in front of the loaf, square, I can never slice even slices, I always stand a little side on to the bench, and it works." They added, "It's probably different for you though!"
Start from the bottom. If a domed top makes the blade skate, WatertownNewbie suggests: "Flip the loaf over and start at an edge of the bottom." For a pan loaf, Lazy Loafer added, "starting on a bottom corner works too."
Groove a hard crust. Pantry Mama's tip: "use the knife to make a small groove so that you have a guide to use."
How Do You Slice the Last Few Inches Without a Wedge?
When the loaf gets too short to stand upright, lay it on its side and slice down through it. It has a broad base again and is easier to keep steady for the last few slices.
Lay the heel so the crust rests on the board; your other hand then holds a wide stretch of crust instead of a narrow edge. Benito on Breadtopia does the same with wide loaves: "Because my knife isn't long enough to slice across the full width of the loaf when it is wide, I turn the boule or 'bouletard' on its side."
Stop when the piece is too small to hold with your fingers well clear of the blade, and cube the end for croutons.
Does the Method Change for a Batard or a Sandwich Loaf?
The method stays the same; only the starting point changes.
| Loaf shape | Where to start | What to watch |
|---|---|---|
| Round boule | As in the steps above | Middle slices are larger than end slices, but the thickness can match |
| Oval batard | One short end, or halve a long one | A wide loaf can outrun a short knife; turn it on its side |
| Sandwich (pan) loaf | A bottom corner, after a trim cut | The sloped tin end makes the first slice thick at the top |
When Does a Slicing Guide or Hand-Crank Slicer Make Sense?
A tool makes sense when you slice whole loaves often and would rather set the thickness once than judge each slice by eye. If you slice a few pieces at a time, the steps above are enough.
A slicing guide holds the knife upright if your loaf fits its frame; our full knife vs slicer comparison compares the tools.
The slicer described here is the AltitudeCraft Manual Bread Slicer, which AltitudeCraft sells. With a hand-crank slicer, the guide holds the thickness and the crank drives the blade. Here, a knob and cm/inch scale set the guide up to 1 in, and the crank turns a 7.6 in stainless steel serrated blade, no electricity needed. The packaging describes it as giving "more even slices than cutting with a knife," a claim we have not measured.
It fits loaves up to 5.5 in tall and 10 in wide; halve larger rounds first. See the loaf sizes it fits.
AltitudeCraft Manual Bread Slicer: set the slice thickness once, up to 1 in; fits loaves up to 5.5 in tall and 10 in wide.
$89.99
How We Put This Guide Together
This is a technique guide, not a product test. We built the steps from America's Test Kitchen's bread-slicing guidance, Pantry Mama's tip for hard crusts, and advice from home bakers on The Fresh Loaf and Breadtopia forums, quoted by username and checked against the original posts in October 2026. We have not yet photographed or measured these knife steps ourselves, so images marked "Illustration" are drawings; we will update this page when our own step photos are ready. The slicer's size limit comes from our bread slicer guide; the 1 in maximum thickness comes from our own test of the slicer.
Frequently Asked Questions About Slicing Sourdough Evenly
Should you slice sourdough upside down?
It often helps. The flatter bottom crust gives the blade a grip, so the first stroke does not skate across a domed top.
Can you slice sourdough with a chef's knife?
You can, but it is harder to cut sourdough bread straight with one: a smooth blade can skate on a hard crust, while a serrated one grips and saws.
How do you cut a round sourdough loaf so the slices are the same size?
You can match the thickness, not the size: middle slices of a round are always larger than end slices.
Why is my first slice always thicker?
Because the end of the loaf is not square: a pan loaf's end slopes outward and a round loaf curves away. Treat the first cut as a trim and measure your thickness from the flat face it leaves.
Do bread slicing guides work for sourdough?
They keep the knife upright, which helps with slanted slices, but check that your usual loaf fits the guide's opening.
The Bottom Line on Slicing Sourdough Evenly
Even slices come from a steady angle, not a special knife. If you slice whole loaves every week and would rather set the thickness once, see the AltitudeCraft Manual Bread Slicer or browse our Kitchen & Baking collection. More guides: the AltitudeCraft Kitchen blog.
Sources
- America's Test Kitchen: How to Slice Bread
- Pantry Mama, Kate Freebairn: How To Slice Sourdough Bread Perfectly (2020-06-19)
- The Fresh Loaf forum: How to slice (2018)
- The Fresh Loaf forum: How to slice a sandwich loaf (2010)
- Breadtopia forum: Slicing Boules (2021)
