Calculate engineering stress σ = F/A and engineering strain ε = ΔL/L₀ under uniaxial load. Choose what to solve: for stress, enter force F (N) and cross-section area A (mm²) → result in MPa; for strain, enter original length L₀ and elongation ΔL (negative for compression) → dimensionless ratio. Units are self-consistent (N, mm) so stress comes out directly in MPa.

Math & Numbers

Tensile & Yield Strength Calculator

Compute engineering tensile strength σ_uts = F_max/A₀, yield strength σ_y = F_y/A₀ (optional), and the yield ratio σ_y/σ_uts from a uniaxial tension test. Forces in kN, area in mm² → stress in MPa. A₀ is the original cross-section. Yield ratio <0.55 high ductility, 0.55–0.85 moderate, >0.85 low ductility.

Math & Numbers

Weir Flow Calculator (Rectangular & V-Notch Weirs)

Compute the discharge over a sharp-crested thin-plate weir. Rectangular (suppressed, no side contraction): Q = (2/3)·C_d·√(2g)·b·H^1.5. V-notch (triangular): Q = (8/15)·C_d·√(2g)·tan(θ/2)·H^2.5. b is the crest width, H the head over the crest (or over the vertex for a V-notch), θ the notch angle. If C_d is left blank it defaults to 0.611 for rectangular weirs (Rehbock/Francis typical value) and 0.58 for V-notch weirs. Crest width in m/cm, head in m/cm/mm; output in m³/s, L/s, L/min and m³/h.

Math & Numbers

Wedge Angle Force Calculator

Calculate the force-amplification ratio and self-locking condition of a wedge mechanism. Ideal M = 1/tan(α), with friction M = 1/tan(α+ρ) where ρ = arctan(μ). Self-locking when α ≤ ρ (i.e. tan(α) ≤ μ).

Finance

Student Loan Calculator

Calculate student loan repayment with an optional grace period and subsidized/unsubsidized interest. Unsubsidized loans accrue interest during the grace period that capitalizes into principal; subsidized loans do not. Shows monthly payment, total interest, total repayment, a balance curve, and a yearly breakdown.

Math & Numbers

Wavelength Calculator (λ = v/f, period, wave number, angular frequency)

Solve wavelength, frequency, or wave speed from v=f·λ, with derived period, angular frequency, wave number, and photon energy

Math & Numbers

Watt to KW

Convert watts to kilowatts with configurable decimal precision

Math & Numbers

TB to TiB

Convert terabytes to tebibytes with decimal vs binary interpretation, alternate-system comparison, and network-speed-aware transfer estimates

Math & Numbers

TB to GB

Convert terabytes to gigabytes with decimal vs binary interpretation, alternate-system comparison, and transfer estimates

Math & Numbers

Weeks to Days

Convert weeks to days with configurable decimal precision

Math & Numbers

Tablespoon to Teaspoon

Convert US tablespoons to US teaspoons with configurable decimal precision

Math & Numbers

Teaspoon to Tablespoon

Convert US teaspoons to US tablespoons with configurable decimal precision