Math & Numbers
Compute the Reynolds number Re = ρ·v·D/μ (dynamic viscosity) or Re = v·D/ν (kinematic viscosity, ν = μ/ρ) and classify the flow regime: Re < 2300 laminar, 2300 ≤ Re < 4000 transitional, Re ≥ 4000 turbulent. Diameter accepted in m/cm/mm. In dynamic mode the kinematic viscosity ν = μ/ρ is also returned. For internal pipe flow and general fluid-mechanics regime analysis.
reynolds-number-calculatorMath & Numbers
Compute complex admittance Y = 1/Z = G + jB for series or parallel RLC circuits: G = R/|Z|², B = −X/|Z|². Returns conductance, susceptance, magnitude and phase angle. Supports any subset of R/L/C.
admittance-calculatorMath & Numbers
Compute complex impedance, magnitude |Z| and phase angle φ for series or parallel RLC circuits: X_L=2πfL, X_C=1/(2πfC), |Z|=√(R²+X²), φ=atan2(X,R). Supports any subset of R/L/C and an optional linear frequency sweep.
impedance-calculatorMath & Numbers
Compute the operating time of an inverse-time overcurrent relay per IEC 60255-151: t = TMS·(k/((I/I_s)^α − 1)). Supports Standard Inverse (SI), Very Inverse (VI), Extremely Inverse (EI) and Long-Time Inverse (LTI) curves, and samples a T-I characteristic.
relay-setting-calculatorMath & Numbers
Estimate the three-phase symmetric short-circuit current using the IEC 60909 far-from-generator method: I"_k = c·U_n/(√3·|Z|) and i_p = κ·√2·I"_k with κ = 1.02 + 0.98·e^(−3R/X). Source impedance is the series sum of transformer and line R/X.
short-circuit-current-calculatorMedia
Decode PQ or HLG AVIF, convert BT.2020 to sRGB, and tone map highlights into a viewable SDR PNG.
hdr-avif-to-sdr-pngMedia
Decode HEIC photos to compatible JPEG with quality, chroma subsampling, and background controls.
heic-to-jpgMedia
Decode HEIC photos to verified 24/32-bit or high-precision 48/64-bit PNG files.
heic-to-pngMedia
Inspect real sample depth, stored pixel depth, channels, palette, alpha, color space, ICC, and HDR metadata.
image-bit-depth-inspectorMedia
Convert images to exact monochrome, indexed, grayscale, RGB, or RGBA PNG bit depths with verified output.
image-to-bit-depth-pngMedia
Store PNG pixels as true 16-bit-per-channel grayscale, 48-bit RGB, or 64-bit RGBA PNG.
png-to-16bit-pngMath & Numbers
Size the shunt capacitor needed to raise the power factor: C = P·(tanφ₁ − tanφ₂)/(2π·f·U²). Returns compensated reactive power Qc, capacitive reactance Xc, capacitor current Ic, and the required capacitance in F/μF.
power-factor-correction