Tools

This is an index, not a set of bare calculator pages. Each tool lives inside its article, so the assumptions behind the numbers are on screen next to the inputs. Once an entry is live it links to the article that hosts it.

Every calculation runs locally in your browser. No signal data, file or measurement is transmitted anywhere.

Hann window magnitude response with main lobe and decaying sidelobes — Browse the full index of embedded tools — each one runs entirely in your browser.

Core tools

Published
dB / Level Converter

dBFS, dBu, dBV, dBm, dB SPL and linear V rms, all six representations at once.
Published
IEEE 754 Float ↔ Hex Converter

32- and 64-bit bit patterns, with the decoded fields and the rebuild check shown separately.
Published
Window Function Generator

Coefficients, time-domain shape and magnitude response for Hann, Hamming, Blackman, Blackman-Harris, Nuttall, Blackman-Nuttall, flat-top and rectangular windows.
Published
FFT / RMS / Peak Spectrum Analyser

Windowed spectrum with peak, interpolated peak, RMS, crest factor, noise floor and noise density — including capture file import.
Published
Dual-Channel Coherence Analyser

Magnitude-squared coherence and cross-spectrum phase with user-set averaging, the significance threshold drawn on the plot, and a delay you can dial in.
Published
FIR Filter Coefficient Generator

Windowed-sinc low-pass, high-pass, band-pass and band-stop coefficient sets with measured transition width, attenuation and group delay.

Extended tools

Published
THD / Distortion Analyser

THD, THD+N, SNR, SINAD and ENOB with a harmonic table, from a generated tone or a capture.
Published
Biquad Coefficient Generator

Eight filter types with Q, bandwidth or shelf slope, plus magnitude, group delay and coefficient output for C, Python or CSV.
Published
SPL & Power Calculator

Level against distance from a sensitivity and a power, with air absorption, cabinet stacking and the power a target level needs.
Published
Level Summation Calculator

Correlated and uncorrelated summation, source stacking, noise-floor subtraction and power averaging.
Published
Loudness & True Peak Analyser

ITU-R BS.1770 integrated loudness with the K-weighting curve, gate levels and EBU Tech 3342 range, plus 4x true peak.
Published
Room Mode Calculator

Rectangular-room mode frequencies by type, coincidence analysis, the Schroeder frequency and modal density.

Supporting tools

Published
CRC Calculator

CRC-8, CRC-16 and CRC-32 with the standard parameter sets, custom poly/init/refin/refout, and both wire byte orders.
Published
Nyquist Sampling Calculator

Alias folding, samples per cycle, oversampling gain in dB and bits, and jitter-limited SNR.
Published
Acoustic Time-Distance Calculator

Distance, time and samples against air temperature and humidity, with wavelength readouts.

Accuracy and limits

These calculators implement standard, published formulae. They are engineering aids, not instruments, and no result should be treated as a substitute for a calibrated measurement. The precision of each output, and the conditions under which it is valid, are stated in the accompanying article.