How do I convert ns to fs?

Use the formula shown above or enter a value to see ns converted to fs instantly.

What is the formula for ns to fs?

The converter calculates fs by applying the category-specific conversion factor for Time.

When should I use ns vs fs?

ns and fs are both part of the Time category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Time Conversion Reference

Convert ns to fs

Use the live converter below to translate between Nanosecond (ns) and Femtosecond (fs). Scroll further for quick examples, formula tips, and related units.

Formula insight: Most unit conversions use a simple multiplication or division by a conversion factor. The calculator shows the exact formula used.

Convert

ns → fs

Nanosecond

Femtosecond

1,000,000

Rounded result (4 decimals max)

Formula

1 ns = 1,000,000 fs

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table

Results update as you type. Swap the direction to convert back from fs to ns.

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ns to fs quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Nanosecond (ns)	Femtosecond (fs)
0.25 ns	250,000 fs
0.5 ns	500,000 fs
1 ns	1,000,000 fs
2 ns	2,000,000 fs
5 ns	5,000,000 fs
10 ns	10,000,000 fs
25 ns	25,000,000 fs
100 ns	100,000,000 fs

fs back to ns

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Femtosecond (fs)	Nanosecond (ns)
0.25 fs	0 ns
0.5 fs	0 ns
1 fs	0 ns
2 fs	0 ns
5 fs	0 ns
10 fs	0 ns
25 fs	0 ns
100 fs	0.0001 ns

Explore more time conversion reference

ns → ps

Convert into Picosecond without leaving SwapUnits.

ns → µs

Convert into Microsecond without leaving SwapUnits.

ns → ms

Convert into Millisecond without leaving SwapUnits.

ns → s

Convert into Second without leaving SwapUnits.

ns → min

Convert into Minute without leaving SwapUnits.

ns → h

Convert into Hour without leaving SwapUnits.

Compare all time conversion reference

View the full unit roster, charts, and tips for Time Conversion Reference conversions.

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