Number drill to decimal inches
Type a value in drill to get it in in instantly.
0.201in
That's about the same as the tap drill for 1/4-20 (#7).
Convert the other way: in to drill
What it means
How wide is that hole?
Sizes from ASME B94.11M. Between two listed drills the label shows the nearest one; the millimeters are exact.
The math
How to convert drill to in
Number and letter drills are a table: #29 = 0.1360 in = 3.454 mm, #7 = 0.2010 in, F = 0.2570 in. Millimeters = inches × 25.4.
Example: #7 drill = 0.201 in.
Every unit
That drill in every system
Tables
drill to in conversion table
| drill | in |
|---|---|
| #1 drill | 0.228 in |
| #3 drill | 0.213 in |
| #5 drill | 0.2055 in |
| #7 drill | 0.201 in |
| #10 drill | 0.1935 in |
| #15 drill | 0.18 in |
| #20 drill | 0.161 in |
| #21 drill | 0.159 in |
| #25 drill | 0.1495 in |
| #29 drill | 0.136 in |
| #30 drill | 0.1285 in |
| #33 drill | 0.113 in |
| #36 drill | 0.1065 in |
| #40 drill | 0.098 in |
| #43 drill | 0.089 in |
| #50 drill | 0.07 in |
| #60 drill | 0.04 in |
| #70 drill | 0.028 in |
| #80 drill | 0.0135 in |
in to drill conversion table
| in | drill |
|---|---|
| 0.0135 in | #80 drill |
| 0.028 in | #70 drill |
| 0.04 in | #60 drill |
| 0.07 in | #50 drill |
| 0.089 in | #43 drill |
| 0.098 in | #40 drill |
| 0.107 in | #36 drill |
| 0.113 in | #33 drill |
| 0.129 in | #30 drill |
| 0.136 in | #29 drill |
| 0.15 in | #25 drill |
| 0.159 in | #21 drill |
| 0.161 in | #20 drill |
| 0.18 in | #15 drill |
| 0.194 in | #10 drill |
| 0.201 in | #7 drill |
| 0.205 in | #5 drill |
| 0.213 in | #3 drill |
| 0.228 in | #1 drill |
Quick answers
Quick answers
- How many in is #1 drill?
- #1 drill is 0.228 in.
- How many in is #10 drill?
- #10 drill is 0.1935 in.
- How many in is #7 drill?
- #7 drill is 0.201 in.
The units
About these units
Number drill (drill)
Number drills #1 to #80.
Decimal inches (in)
The diameter in inches, as charts list it.
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