This page converts feet into picometers using the factor 3.048e+11, and shows the reverse figure alongside it. Both units measure length, which is why one number does the whole job.
Twelve inches, or exactly 0.3048 metres — still standard for human height and aviation altitude in the US. One trillionth of a metre, the SI unit crystallographers use where chemists still reach for angstroms.
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". Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into picometers, which is usually more useful than the bare number.
The formula
feet- The amount you are converting, in feet
304,800,000,000- The exact number of picometers in one foot
picometers- The converted result
How it works, step by step
- Enter the value in feet.
- It is multiplied by 304,800,000,000, the exact factor between the two units.
- The answer is shown in picometers, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
The Eiffel Tower: 1080 ft in picometers
At 1080 ft (the eiffel tower), the same quantity in picometers is 1080 × 3.048e+11 = 3.29184e+14 pm. One foot is 3.048e+11 picometers, so the numbers grow as expected.
A door height: 6.67 ft in picometers
At 6.67 ft (a door height), the same quantity in picometers is 6.67 × 3.048e+11 = 2.03302e+12 pm. One foot is 3.048e+11 picometers, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many picometers are in one foot?
Exactly 304,800,000,000. 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 feet to picometers?
picometers = feet × 304,800,000,000. Reversed, feet = picometers ÷ 304,800,000,000, which is the same as multiplying by 3.28083989501e-12.
Which is the bigger unit, the foot or the picometer?
The foot. One foot equals 3.048e+11 picometers.
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 foot?
Twelve inches, or exactly 0.3048 metres — still standard for human height and aviation altitude in the US.
What is a picometer?
One trillionth of a metre, the SI unit crystallographers use where chemists still reach for angstroms.
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.
Is there a quick way to do ft to pm in my head?
Plenty of people do this in their head: multiply by 300000000000.000000 instead of using the exact factor 304800000000.000000. At 100 that shortcut gives 3.0000e+13 picometers, off by 480000000000.000000 picometers or about 1.57%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Feet to picometers reference tables
| Feet | Picometers |
|---|---|
| 0.5 ft | 1.524e+11 pm |
| 1 ft | 3.048e+11 pm |
| 2 ft | 6.096e+11 pm |
| 3 ft | 9.144e+11 pm |
| 5 ft | 1.524e+12 pm |
| 10 ft | 3.048e+12 pm |
| 20 ft | 6.096e+12 pm |
| 25 ft | 7.62e+12 pm |
| 50 ft | 1.524e+13 pm |
| 75 ft | 2.286e+13 pm |
| 100 ft | 3.048e+13 pm |
| 250 ft | 7.62e+13 pm |
| 500 ft | 1.524e+14 pm |
| 1000 ft | 3.048e+14 pm |
| 5000 ft | 1.52400e+15 pm |
Exact factor: 1 foot = 304,800,000,000 picometers.
| Quantity | ft | pm |
|---|---|---|
| A credit card’s long edge | 0.2808 ft | 8.56e+10 pm |
| A door height | 6.667 ft | 2.032e+12 pm |
| An Olympic pool | 164 ft | 5e+13 pm |
| The Eiffel Tower | 1083 ft | 3.3e+14 pm |
| A marathon | 1.384e+05 ft | 4.220e+16 pm |
| Earth’s diameter | 4.18e+07 ft | 1.274e+19 pm |
Published reference values, converted with the same factor this page uses.