Find the Right Handle for Your Hand

Most tool handles are one-size-fits-all. Your hands are not. Measure once, and know exactly which grip diameters will keep you working without pain.

Start Measuring How to Measure

Grip Size Calculator

Enter your hand dimensions below. Results update as you type.

Quick start:
Fingertip to wrist crease. Example: 18.5
Enter your hand length in centimeters, from fingertip to wrist crease
Widest part of palm, below the fingers. Example: 8.2
Enter your palm width in centimeters, measured across the widest part below the fingers
Grip strength

Your Recommended Handle Diameters

Enter your measurements above to see recommendations.

How to Measure Your Hand

Accurate measurements lead to better recommendations. Follow these steps with a flexible tape measure or ruler.

Hand Length

Place your hand flat on a table, fingers together. Measure from the tip of your middle finger to the crease where your wrist bends. Keep the tape straight, not curved around the skin. Record to the nearest half centimeter.

Palm Width

With your hand still flat, measure across the widest part of your palm. This is usually just below where your fingers meet your palm. Do not include your thumb. Press the tape lightly so it does not compress the flesh.

Grip Strength

Be honest here. If your hands ache after 15 minutes of using a screwdriver, choose "Light." If you regularly turn wrenches or dig for hours, "Strong" is probably right. When in doubt, pick "Average."

Measure Both Hands

Most people have a dominant hand that is slightly larger. Measure both and use the larger set of numbers. If one hand is injured or has limited mobility, measure the healthier hand and note the difference.

Common Mistakes

  • Measuring the back of the hand instead of the palm. Palm width is taken from the palm side, where the handle actually contacts your skin.
  • Including the thumb in palm width. The thumb wraps around the handle from the side. Only measure the four fingers and palm body.
  • Rounding up too much. A half-centimeter difference changes the recommendation. Measure as precisely as you can.
  • Measuring over gloves or with a stiff tape. Use a flexible sewing tape or a piece of string you can then measure against a ruler.
  • Ignoring grip strength. Two people with identical hand sizes can need very different handle diameters based on how hard they grip.

Popular Tool Brands by Handle Diameter

Use this table to match your recommended diameter to real products. Sizes are approximate and can vary by model.

Brand Screwdriver Chisel Hammer Garden Trowel Handle Shape
Stanley FatMax 38–42 mm — 33–36 mm — Tri-lobe soft grip
Wiha 28–32 mm 25–28 mm — — Slim round
Wera 30–35 mm — — — Hexagonal with soft zone
Felco — — — 30–34 mm Ergonomic rotary
DeWalt 36–40 mm — 32–35 mm — Overmolded
Pfiel — 22–26 mm — — Octagonal hardwood
Radius Garden — — — 32–36 mm Natural grip curve
Vessel 26–30 mm — — — Round with dimple
Estwing — — 30–34 mm — Leather or vinyl wrap
Narex — 24–28 mm — — Octagonal beech

Note: Handle diameters are measured at the grip zone, not at the ferrule or base. Always verify with the manufacturer's specs if exact sizing matters for your use case.

Questions People Ask

What if my measurements fall between two size ranges?

Pick the range that matches your grip strength. If you have a strong grip, lean toward the larger end. If your hands tire easily, start with the smaller end and work up.

Can I use this for power tools too?

The recommendations are optimized for hand tools with cylindrical or slightly contoured grips. Power tools often have pistol-grip or D-handle shapes that change the ergonomics. Use the screwdriver or garden tool range as a rough guide, but test before buying.

I have arthritis. Should I always pick the largest handle?

Not necessarily. Very large handles can force wide finger spread, which stresses arthritic joints. For most people with arthritis, a mid-range diameter with a soft, slightly oval grip works best. The sizer flags when a handle may be too large for your hand.

How do I measure if I have limited mobility in one hand?

Use your less-affected hand for measurement, then add 1-2 mm to the palm width to account for swelling or reduced flexibility. If one hand is significantly different, measure each hand separately and use the larger set of recommendations.

Why does grip strength matter if I'm measuring my hand?

Two people with the same hand size can have very different grip strengths. A stronger hand can control a slightly larger diameter without fatigue. A weaker hand needs a smaller diameter to maintain a secure grip without over-squeezing. The strength rating adjusts the diameter range up or down.

How often should I re-measure?

Hand size does not change much in adults, but grip strength can decline with age or improve with exercise. Re-measure if you notice tools feeling different in your hand, or every few years as a check.