Credit: http://en.wikipedia.org/wiki/ResistorWhen designing an electronic circuit, it’s important to keep standard resistor values in mind. When you make the jump from a paper (or SPICE) design to a real circuit on the breadboard, you’re going to need to be using resistors that have a standard values since they are what is available.

Standard Resistor Value Tolerances

There are standardized values for resistors in 3 tolerances:

• 10%
• 5%
• 1%

These three tolerances are what you’ll have available to work with (There are more, but these are the most common, and what we’ll focus on here). 10% resistors will be the cheapest to buy, and 1% will be the most expensive (with 5% somewhere in between).

How do resistor tolerances work? Here’s an example: You have a 5% resistor with a stated value of 220 ohms. Based on the 5% tolerance, it may actually have a value in the range from 209 ohms to 231 ohms. For most applications, 5% resistors are close enough to your calculated value. But sometimes you will need to find a resistor that is much closer (oscillators, timing circuits, etc), in this case, you’ll want to get a 1% precision resistor.

Standard 10% Resistor Values

Here are the standard values for 10% tolerance resistors:

 1 10 100 1.0K 10K 100K 1.0M 1.2 12 120 1.2K 12K 120K 1.5 15 150 1.5K 15K 150K 1.8 18 180 1.8K 18K 180K 2.2 22 220 2.2K 22K 220K 2.7 27 270 2.7K 27K 270K 3.3 33 330 3.3K 33K 330K 3.9 39 390 3.9K 39K 390K 4.7 47 470 4.7K 47K 470K 5.6 56 560 5.6K 56K 560K 6.8 68 680 6.8K 68K 680K 8.2 82 820 8.2K 82K 820K

Note that there are 12 standard values that are simply multiplied by factors of ten that make the values in the chart. Also note that the maximum value for 10% resistors is 1 Mâ„¦.

Standard 5% Resistor Values

Here are the standard values for 5% tolerance resistors:

 1 10 100 1.0K 10K 100K 1.0M 10M 1.1 11 110 1.1K 11K 110K 1.1M 11M 1.2 12 120 1.2K 12K 120K 1.2M 12M 1.3 13 130 1.3K 13K 130K 1.3M 13M 1.5 15 150 1.5K 15K 150K 1.5M 15M 1.6 16 160 1.6K 16K 160K 1.6M 16M 1.8 18 180 1.8K 18K 180K 1.8M 18M 2 20 200 2.0K 20K 200K 2.0M 20M 2.2 22 220 2.2K 22K 220K 2.2M 22M 2.4 24 240 2.4K 24K 240K 2.4M 2.7 27 270 2.7K 27K 270K 2.7M 3 30 300 3.0K 30K 300K 3.0M 3.3 33 330 3.3K 33K 330K 3.3M 3.6 36 360 3.6K 36K 360K 3.6M 3.9 39 390 3.9K 39K 390K 3.9M 4.3 43 430 4.3K 43K 430K 4.3M 4.7 47 470 4.7K 47K 470K 4.7M 5.1 51 510 5.1K 51K 510K 5.1M 5.6 56 560 5.6K 56K 560K 5.6M 6.2 62 620 6.2K 62K 620K 6.2M 6.8 68 680 6.8K 68K 680K 6.8M 7.5 75 750 7.5K 75K 750K 7.5M 8.2 82 820 8.2K 82K 820K 8.2M 9.1 91 910 9.1K 91K 910K 9.1M

There are 24 values, multiplied by factors of ten that make up the values of 5% resistors.

Standard 1% Resistor Values

Here are the standard values for 1% tolerance resistors:

 1 10 100 1.00K 10.0K 100K 1.00M 1.02 10.2 102 1.02K 10.2K 102K 1.05 10.5 105 1.05K 10.5K 105K 1.07 10.7 107 1.07K 10.7K 107K 1.1 11 110 1.10K 11.0K 110K 1.10M 1.13 11.3 113 1.13K 11.3K 113K 1.15 11.5 115 1.15K 11.5K 115K 1.18 11.8 118 1.18K 11.8K 118K 1.21 12.1 121 1.21K 12.1K 121K 1.20M 1.24 12.4 124 1.24K 12.4K 124K 1.27 12.7 127 1.27K 12.7K 127K 1.3 13 130 1.30K 13.0K 130K 1.30M 1.33 13.3 133 1.33K 13.3K 133K 1.37 13.7 137 1.37K 13.7K 137K 1.4 14 140 1.40K 14.0K 140K 1.43 14.3 143 1.43K 14.3K 143K 1.47 14.7 147 1.47K 14.7K 147K 1.5 15 150 1.50K 15.0K 150K 1.50M 1.54 15.4 154 1.54K 15.4K 154K 1.58 15.8 158 1.58K 15.8K 158K 1.62 16.2 162 1.62K 16.2K 162K 1.60M 1.65 16.5 165 1.65K 16.5K 165K 1.69 16.9 169 1.69K 16.9K 169K 1.74 17.4 174 1.74K 17.4K 174K 1.78 17.8 178 1.78K 17.8K 178K 1.82 18.2 182 1.82K 18.2K 182K 1.80M 1.87 18.7 187 1.87K 18.7K 187K 1.91 19.1 191 1.91K 19.1K 191K 1.96 19.6 196 1.96K 19.6K 196K 2 20 200 2.00K 20.0K 200K 2.00M 2.05 20.5 205 2.05K 20.5K 205K 2.1 21 210 2.10K 21.0K 210K 2.15 21.5 215 2.15K 21.5K 215K 2.21 22.1 221 2.21K 22.1K 221K 2.20M 2.26 22.6 226 2.26K 22.6K 226K 2.32 23.2 232 2.32K 23.2K 232K 2.37 23.7 237 2.37K 23.7K 237K 2.43 24.3 243 2.43K 24.3K 243K 2.49 24.9 249 2.49K 24.9K 249K 2.55 25.5 255 2.55K 25.5K 255K 2.61 26.1 261 2.61K 26.1K 261K 2.67 26.7 267 2.67K 26.7K 267K 2.74 27.4 274 2.74K 27.4K 274K 2.8 28 280 2.80K 28.0K 280K 2.87 28.7 287 2.87K 28.7K 287K 2.94 29.4 294 2.94K 29.4K 294K 3.01 30.1 301 3.01K 30.1K 301K 3.09 30.9 309 3.09K 30.9K 309K 3.16 31.6 316 3.16K 31.6K 316K 3.24 32.4 324 3.24K 32.4K 324K 3.32 33.2 332 3.32K 33.2K 332K 3.4 34 340 3.40K 34.0K 340K 3.48 34.8 348 3.48K 34.8K 348K 3.57 35.7 357 3.57K 35.7K 357K 3.65 36.5 365 3.65K 36.5K 365K 3.74 37.4 374 3.74K 37.4K 374K 3.83 38.3 383 3.83K 38.3K 383K 3.92 39.2 392 3.92K 39.2K 392K 4.02 40.2 402 4.02K 40.2K 402K 4.12 41.2 412 4.12K 41.2K 412K 4.22 42.2 422 4.22K 42.2K 422K 4.32 43.2 432 4.32K 43.2K 432K 4.42 44.2 442 4.42K 44.2K 442K 4.53 45.3 453 4.53K 45.3K 453K 4.64 46.4 464 4.64K 46.4K 464K 4.75 47.5 475 4.75K 47.5K 475K 4.87 48.7 487 4.87K 48.7K 487K 4.99 49.9 499 4.99K 49.9K 499K 5.11 51.1 511 5.11K 51.1K 511K 5.23 52.3 523 5.23K 52.3K 523K 5.36 53.6