Science & Engineering
Ohm's law, pH, density, kinematics — tools for students and engineers.
Browse 9 free science & engineering tools that run entirely in your browser. No signup, no uploads, and no data stored — everything calculates or processes locally on your device. Use these tools for quick calculations, conversions, and everyday tasks with clear explanations and FAQs on every page.
Ohm's Law Calculator
Solve for voltage, current, or resistance given any two values.
Resistor Color Code Calculator
Decode a 4-band resistor color code to its resistance value.
Voltage Divider Calculator
Output voltage, current, and power for a resistor voltage divider.
Torque Calculator
Calculate torque in N·m, ft·lb, and in·lb from force and moment arm.
Newton's Second Law Calculator
Solve F = ma for force, mass, or acceleration.
Density Calculator
Solve for density, mass, or volume (ρ = m/V).
pH Calculator
H⁺ concentration, pOH, and classification from a pH value.
Half-Life Calculator
Remaining quantity after radioactive decay over any time period.
Kinematics Calculator
Solve SUVAT equations for velocity, acceleration, time, and displacement.
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Finance & MoneyLoan Calculator
Monthly payment, total interest, and total cost for any fixed-rate loan.
Health & FitnessBMI Calculator
Body mass index, WHO category, and your healthy weight range.
Math & EducationPercentage Calculator
Percent of a number, percent one number is of another, and percent change.
Developer ToolsJSON Formatter & Validator
Format, validate, and minify JSON with precise error messages.
Text ToolsWord Counter
Words, characters, sentences, paragraphs, and reading time — live.
PDF ToolsMerge PDF
Combine several PDF files into one, in any order.
Image ToolsImage Compressor
Shrink image file size with a live quality preview.