Samsung Galaxy S25 Fe vs Samsung Galaxy S25 Ultra: SAR comparison

The Samsung Galaxy S25 Fe lists the lower head sar, cellular only (us): 1.04 W/kg vs 1.26 W/kg for the Samsung Galaxy S25 Ultra (17% lower). Reported SAR values in W/kg; lower is shaded green and higher red within each row, for comparison only.

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Side-by-side SAR values

Samsung Galaxy S25 Fe vs Samsung Galaxy S25 Ultra reported SAR and specs
Measurement	Samsung Galaxy S25 Fe	Samsung Galaxy S25 Ultra
Head SAR, cellular only (US)	1.04 W/kg	1.26 W/kg
Body SAR, cellular only (US)	1.03 W/kg	0.78 W/kg
Head SAR, Wi-Fi + cellular (US)	1.52 W/kg	1.59 W/kg
Body SAR, Wi-Fi + cellular (US)	1.53 W/kg	1.40 W/kg
Hotspot SAR, cellular only (US)	1.10 W/kg	1.19 W/kg
Hotspot SAR, Wi-Fi + cellular (US)	1.59 W/kg	1.48 W/kg
Display: Type	Dynamic AMOLED 2X, 120Hz, HDR10+, 1900 nits (peak)	Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2600 nits (peak)
Display: Size	6.7 inches, 110.2 cm2 (~89.2% screen-to-body ratio)	6.9 inches (full rectangle); 6.8 inches accounting for rounded corners
Display: Resolution	1080 x 2340 pixels, 19.5:9 ratio (~385 ppi density)	1440 x 3120 pixels, 19.5:9 ratio (~505 ppi density)
Display: Protection	Corning Gorilla Glass Victus+	Corning Gorilla Armor 2
Hardware: Operating System	Android 15, up to 7 major Android upgrades, One UI 7	Android 15, up to 7 major Android upgrades, One UI 7
Hardware: Chipset	Exynos 2400 (4 nm)	Snapdragon 8 Elite for Galaxy
Hardware: CPU	10-core (1x3.2GHz Cortex-X4 & 2x2.9GHz Cortex-A720 & 3x2.6GHz Cortex-A720 & 4x1.95GHz Cortex-A520)	Octa-core (2x4.19 GHz & 6x2.90 GHz)
Hardware: GPU	Xclipse 940	Adreno 830 (1.25 GHz)
Battery: Type	Si/C Li-Ion 4500 mAh	Li-Ion 5000 mAh, non-removable
Battery: Charging	45W wired, PD, QC2 15W wireless Reverse wireless	45W wired, PD3.0, 65% in 30 min (advertised) 25W wireless (Qi2/PMA) 4.5W reverse wireless
Design: Type	Bar	Bar
Design: Dimensions	161.3 x 76.6 x 7.4 mm (6.35 x 3.02 x 0.29 in)	162.8 x 77.6 x 8.2 mm (6.41 x 3.06 x 0.32 in)
Design: Weight	190 g (6.70 oz)	218 g
Design: Colors	Dark Blue, Light Blue, Black, White	Titanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray; additional colors may vary by market

Colors make differences within the same measurement easy to see. They do not label a phone safe or unsafe. US values use 1 g of tissue and the 1.6 W/kg limit; EU values use 10 g and 2 W/kg, so don't mix them. What SAR tells you.

Questions and answers

Which has lower head SAR, the Samsung Galaxy S25 Fe or the Samsung Galaxy S25 Ultra?

The Samsung Galaxy S25 Fe lists the lower head sar, cellular only (us): 1.04 W/kg vs 1.26 W/kg for the Samsung Galaxy S25 Ultra (17% lower). Values are reported maximums from FCC filings as listed in the RF Safe dataset, in W/kg averaged over 1 gram of tissue.

Which has lower body SAR, the Samsung Galaxy S25 Fe or the Samsung Galaxy S25 Ultra?

The Samsung Galaxy S25 Ultra lists the lower body sar, cellular only (us): 0.78 W/kg vs 1.03 W/kg for the Samsung Galaxy S25 Fe (24% lower). Values are reported maximums from FCC filings as listed in the RF Safe dataset, in W/kg averaged over 1 gram of tissue.

Which has lower hotspot SAR (Wi-Fi + cellular), the Samsung Galaxy S25 Fe or the Samsung Galaxy S25 Ultra?

The Samsung Galaxy S25 Ultra lists the lower hotspot sar, wi-fi + cellular (us): 1.48 W/kg vs 1.59 W/kg for the Samsung Galaxy S25 Fe (7% lower). Values are reported maximums from FCC filings as listed in the RF Safe dataset, in W/kg averaged over 1 gram of tissue.

What is the highest reported SAR value for each phone?

Across the six US measurements, the Samsung Galaxy S25 Fe's highest listed value is 1.59 W/kg and the Samsung Galaxy S25 Ultra's is 1.59 W/kg. The FCC limit for the head and body is 1.6 W/kg averaged over 1 gram. Wi-Fi + cellular values are simultaneous-transmission sums and are evaluated differently, so read each row on its own.

Does a lower SAR mean a phone is safer?

No. SAR is a lab compliance measurement taken at maximum power. Everyday exposure depends on signal strength, distance from the body and which radios are active. Use SAR to compare phones, not as a health score.

Where do these numbers come from?

From the RF Safe SAR dataset, compiled from FCC equipment authorization filings (FCC ID A3LSMS731U and A3LSMS938B). Nothing on this page is estimated.

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