How do I convert µs to fs?

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

What is the formula for µs to fs?

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

When should I use µs vs fs?

µs 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 µs to fs

Use the live converter below to translate between Microsecond (µs) 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

µs → fs

Microsecond

µs

Femtosecond

1,000,000,000

Rounded result (4 decimals max)

Formula

1 µs = 1,000,000,000 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

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µs 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.

Microsecond (µs)	Femtosecond (fs)
0.25 µs	250,000,000 fs
0.5 µs	500,000,000 fs
1 µs	1,000,000,000 fs
2 µs	2.00000×10^9 fs
5 µs	5.00000×10^9 fs
10 µs	1.00000×10^10 fs
25 µs	2.5×10^10 fs
100 µs	1.00000×10^11 fs

fs back to µs

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

Femtosecond (fs)	Microsecond (µs)
0.25 fs	2.5×10^-10 µs
0.5 fs	5.00000×10^-10 µs
1 fs	1.00000×10^-9 µs
2 fs	2.00000×10^-9 µs
5 fs	5.00000×10^-9 µs
10 fs	1.00000×10^-8 µs
25 fs	2.5×10^-8 µs
100 fs	0 µs