Physics
Sound pressure level
Calculates SPL = 20*log10(p_rms/p_ref) and inverse p_rms = p_ref*10^(SPL/20).
Related calculators
Sound intensity level
Calculates L_I = 10*log10(I/I_ref), by default relative to 10^-12 W/m².
Sound level summation
Sums a list of levels L_total = 10*log10(sum(10^(L_i/10))) with a 128-value limit.
Acoustic impedance
Calculates plane-wave characteristic acoustic impedance Z = rho*c.
Beats
Calculates beat frequency f_beat = |f1 - f2|.
Doppler effect
Calculates f_obs = f_src*(v + s_o*v_o)/(v - s_s*v_s) for a stationary medium.
Geometric spreading
Calculates free-field point-source level drop: L2 = L1 - 20*log10(r2/r1).