How to Measure Your Bandsaw Blade

Method 1 — Measuring an Existing Blade

The easiest and most accurate way to find your blade length is to measure your existing blade directly.

1. Switch off and unplug your bandsaw machine and wait for it to come to a complete stop.
2. Carefully remove the existing blade from the machine following your machine manufacturer's instructions.
3. Lay the blade out flat on the floor in a large loop or straight line.
4. Using a tape measure, measure the total length of the blade from one end to the other (if straightened out), or measure the full circumference of the loop.
5. Note the measurement in millimetres — this is your blade length.

If your blade is already broken or you do not have an existing blade to measure from, use Method 2 below.

Method 2 — Measuring Around the Wheels

If you do not have an existing blade, you can calculate the blade length by measuring the blade path around your bandsaw's wheels.

1. Switch off and unplug your bandsaw machine.
2. Open the blade guards and wheel covers following your machine manufacturer's instructions.
3. Take a piece of thin string, cord, or a cloth tape measure.
4. Loop the string around both bandsaw wheels, following the exact path the blade would travel.
5. Mark the point where the string meets itself to complete the loop.
6. Remove the string and measure its length from the start to the mark — this is your blade length.
7. Note the measurement in millimetres.

Method 3 — Check Your Machine Manual or Plate

Many bandsaw machines have a data plate or label on the body of the machine that states the recommended blade length. Check the side, rear or inside of the blade guard door for a manufacturer's label. Your machine manual will also typically state the correct blade length in the specifications section.

If your manual states the blade length in inches, you can convert to millimetres by multiplying by 25.4. For example, 98 inches × 25.4 = 2489.2mm, which you would round to the nearest millimetre.

Measuring Width, Thickness and TPI

Length is only part of the size. To order a blade that fits and cuts properly, you also need its width, thickness and teeth per inch (TPI). Check these on your old blade with the machine isolated.

• Width — measure straight across the blade from the tips of the teeth to the back edge. Common widths are often quoted in inches, such as 1/2" (about 12.7mm).
• Thickness — use a vernier or digital caliper on the flat back of the blade, away from the teeth. Measuring across the teeth gives a false reading because the teeth are set outwards.
• TPI — count the number of tooth tips in one inch (25.4mm). If the spacing changes along the blade, it is a variable pitch blade: count over several inches and note the coarsest and finest spacing, for example 10/14 TPI.

Not sure which TPI you should be using for your material? Our bimetal bandsaw blade information and carbon bandsaw blade information pages explain how to match the blade to the job.

Tips for Getting the Right Length

• Always measure in millimetres where possible for the most accurate result
• If you are between two measurements, order the longer size — most bandsaws have wheel tension adjustment to accommodate slight variations
• Double check your measurement before ordering — all our blades are made to order to your exact specification
• If you are unsure, feel free to contact us and we will be happy to help

Common Measuring Mistakes

• Mixing up inches and millimetres. Always double check which unit your manual or old blade label uses, and convert inches by multiplying by 25.4.
• Measuring a coiled blade. A coiled or twisted blade is hard to measure accurately. Uncoil it carefully, wearing gloves, and lay it out flat first.
• Using a stretchy cord for Method 2. Elastic string gives a short reading. Use thin, non-stretch string or a cloth tape.
• Setting the wheels at full tension for Method 2. Measure with the tension adjustment roughly in the middle of its travel, so the new blade can be tightened or slackened as needed.
• Measuring thickness over the teeth. The set of the teeth makes the blade look thicker than it is. Measure the back of the blade.

Frequently asked questions

Is bandsaw blade length measured inside or outside the loop?

Blade length is the total length of the band, the same as if it were cut and laid out straight. Measuring along the back edge of the loop with a flexible tape, or marking a start point and rolling the blade along the floor, gives a reliable figure.

What if my measurement falls between two sizes?

As our tips above explain, order the longer size, as most bandsaws have wheel tension adjustment that can take up a small difference. Because our blades are made to order, you can also enter your exact length.

Can I find my blade size printed on the old blade?

Often, yes. Many blades have the length, width and TPI printed or etched near the weld or on a label. Check it against a quick measurement, as old labels can be worn or the blade may have been rewelded.

Where can I see common bandsaw blade sizes?

Our popular sizes page lists frequently ordered blade sizes, which can help you confirm your measurement looks right.

Ready to Order?

Once you have your blade length, head to our order page to configure your blade. Enter your length, choose your width and TPI, and we will cut your blade to your exact specification with free delivery on all UK orders.