To convert picas to light-years, multiply by 4.474636864e-19. That factor is the whole relationship: both units measure length, so the conversion is a proportion with no offset and no substance-specific constant.
The distance light covers in one Julian year — about 9.46 trillion kilometres. Twelve points, or 1/6 inch — the column-width unit of print layout.
The mil and the millimetre are not the same thing and are out by a factor of about forty. A mil is one thousandth of an inch — 0.0254 mm — and a spec sheet that quotes film thickness in mils means the small unit. British drawings write the same size as "thou". The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in light-years, so you can sanity-check whether your answer is a plausible size.
The formula
picas- The amount you are converting, in picas
4.47463686404e-19- The exact number of light-years in one pica
light-years- The converted result
How it works, step by step
- Enter the value in picas.
- It is multiplied by 4.47463686404e-19, the exact factor between the two units.
- The answer is shown in light-years, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A credit card’s long edge: 20.2 pica in light-years
Take a credit card’s long edge, roughly 20.2 pica. The conversion is a single multiplication — 20.2 × 4.47464e-19 — giving 9.03877e-18 ly. Because the relationship is proportional, doubling the input doubles the answer to 1.80775e-17 ly.
A door height: 480 pica in light-years
At 480 pica (a door height), the same quantity in light-years is 480 × 4.47464e-19 = 2.14783e-16 ly. One pica is 4.47464e-19 light-years, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many light-years are in one pica?
Exactly 4.47463686404e-19. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert picas to light-years?
light-years = picas × 4.47463686404e-19. Reversed, picas = light-years ÷ 4.47463686404e-19, which is the same as multiplying by 2.23481822187e+18.
Which is the bigger unit, the pica or the light-year?
The light-year. One pica is only 4.47464e-19 of a light-year, so it takes 2.23482e+18 picas to make one light-year.
What does this quantity actually measure?
Both units measure length. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a pica?
Twelve points, or 1/6 inch — the column-width unit of print layout.
What is a light-year?
The distance light covers in one Julian year — about 9.46 trillion kilometres.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Picas to light-years reference tables
| Picas | Light-Years |
|---|---|
| 0.5 pica | 2.23732e-19 ly |
| 1 pica | 4.47464e-19 ly |
| 2 pica | 8.94927e-19 ly |
| 3 pica | 1.34239e-18 ly |
| 5 pica | 2.23732e-18 ly |
| 10 pica | 4.47464e-18 ly |
| 20 pica | 8.94927e-18 ly |
| 25 pica | 1.11866e-17 ly |
| 50 pica | 2.23732e-17 ly |
| 75 pica | 3.35598e-17 ly |
| 100 pica | 4.47464e-17 ly |
| 250 pica | 1.11866e-16 ly |
| 500 pica | 2.23732e-16 ly |
| 1000 pica | 4.47464e-16 ly |
| 5000 pica | 2.23732e-15 ly |
Exact factor: 1 pica = 4.47463686404e-19 light-years.
| Quantity | pica | ly |
|---|---|---|
| A credit card’s long edge | 20.22 pica | 9.048e-18 ly |
| A door height | 480 pica | 2.148e-16 ly |
| An Olympic pool | 1.181e+04 pica | 5.285e-15 ly |
| The Eiffel Tower | 7.795e+04 pica | 3.488e-14 ly |
| A marathon | 9.967e+06 pica | 4.460e-12 ly |
| Earth’s diameter | 3.01e+09 pica | 1.347e-09 ly |
Published reference values, converted with the same factor this page uses.