Toy Noise Level Safety Calculator
Check if a toy noise level is safe for children.
Enter measured dB and distance, then calculate sound pressure at 50 cm per ASTM F963 and EN 71-1 limits.
Loud toys can damage children’s hearing. ASTM F963 and EN 71-1 both set maximum sound level limits measured at 50 cm from the toy.
Limits:
- Handheld toys and toys pressed against the ear: 65 dB(A) at 50 cm
- Floor toys and toys operated at arm’s length: 85 dB(A) at 50 cm
Why 50 cm? It approximates the distance from a held toy to a child’s ear.
Converting a measurement taken at a different distance:
dB_50cm = dB_measured + 20 x log10(d_measured / 0.50)
This applies the inverse square law: each doubling of distance reduces sound pressure by 6 dB. If you measured 80 dB at 30 cm, the equivalent at 50 cm is 80 + 20 x log10(0.30/0.50) = 80 - 4.4 = 75.6 dB.
Key note: This formula assumes free-field conditions (no reflective surfaces). Measurements in a room will be somewhat higher. For borderline cases, measure in the open or add a 2-3 dB safety margin.
Testing with a calibrated sound level meter (SLM) set to A-weighting, slow response, at the specified distance gives the most reliable result. Smartphone apps are useful for screening but should not be used for compliance documentation.