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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →A cellphone’s absorption rate is usually its specific absorption rate (SAR): the rate at which radiofrequency (RF) energy is absorbed per unit mass of body tissue. It is measured in watts per kilogram (W/kg). A phone’s published maximum SAR is a result from a compliance test, not a readout of your exposure during everyday use.
What SAR measures
SAR describes how quickly RF energy is absorbed relative to the mass of tissue absorbing it. The National Cancer Institute explains SAR as a measure used to estimate the dose of energy absorbed from a source; the International Telecommunication Union’s technical definition describes it as the time derivative of energy absorbed per unit mass. In practical terms, SAR is not the phone’s total radio output or a person’s cumulative lifetime dose.
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Phone SAR testing uses specified device configurations and exposure conditions. The resulting maximum is a compliance-test value, not a continuous measurement of a person’s exposure. Actual exposure depends on circumstances such as how the phone is used and how far it is from the body. The National Cancer Institute notes that SAR decreases very quickly with distance from the source. National Cancer Institute: Cell Phones and Cancer Risk
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How to interpret SAR limits
A SAR figure only makes sense alongside its jurisdiction, exposure category, body region, and averaging mass. Limits are regulatory criteria for specified evaluations; they are not interchangeable health-risk thresholds.
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| Jurisdiction and category | Limit | What is averaged |
|---|---|---|
| United States, general-population/uncontrolled exposure | 0.08 W/kg | Whole body |
| United States, general-population/uncontrolled exposure | 1.6 W/kg | Peak spatial average over any 1 gram of tissue |
| United States, extremities | 4 W/kg | Average over any 10 grams |
| European Commission public information page, head limit | 2 W/kg | The cited page gives this limit but does not specify the averaging mass in the cited summary |
The U.S. values are set out in 47 CFR § 1.1310. The familiar 1.6 W/kg figure is a localized peak spatial-average limit, not a whole-body average. The European Commission’s public information gives a 2 W/kg head limit and says mobile phones are tested assuming maximum transmission power; its page is older public information, so check current national rules for a current legal comparison. Because the cited U.S. and European localized limits use different averaging bases, the numbers are not a direct like-for-like comparison. European Commission: Mobile phones
What a phone’s maximum SAR can—and cannot—tell you
A high or low maximum SAR number alone does not establish your typical exposure, prove a health risk, or show which phone is safer in ordinary use. In a 2012 decision, the FCC explained that one maximum SAR figure is insufficient to compare likely RF exposure across individual phone models and that SAR testing does not indicate the RF exposure consumers experience during normal use. FCC 12-165
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How to look up a phone’s SAR information
For a phone marketed in the United States, the National Cancer Institute describes searching the FCC database by the phone’s FCC ID. The NCI notes that FCC SAR information covers many phones marketed within the previous one to two years, so availability may vary by device and date. Find the FCC ID on the device or its regulatory materials, then confirm that the official record matches the exact model. National Cancer Institute: Cell Phones and Cancer Risk
Ways to reduce RF exposure during phone use
The FCC guide, as quoted in its decision, says the most effective means to reduce RF exposure are to hold the phone away from the head or body and use a speakerphone or hands-free accessory. These are distance and use measures; the cited guidance does not establish that a particular accessory is required or that products marketed as radiation shields or blockers work safely or effectively. FCC 12-165
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