Calculator collection · 22 distinct tools
Electrical & Engineering Calculators
Solve foundational voltage, current, resistance and power relationships without hiding the formulas.
Electrical pages separate real power, apparent power, current, voltage, power factor, efficiency and ideal component relationships. Formula results are calculation aids—not conductor, breaker or code-compliance recommendations.
Open a real interactive tool instead of landing on a thin keyword page.
Formulas, units and assumptions stay visible beside the result.
Move between genuinely different calculations inside one collection.
Supplier, manufacturer, drawing and standards data remain authoritative where required.
Choose the calculation that matches the job
Each page owns a distinct input/output task. Reciprocal forms stay together when the underlying job is the same.
Calculator
Ohm's Law Calculator — Volts, Amps, Ohms and Watts
Calculate voltage, current, resistance and power from any two positive electrical values using Ohm's Law and Watt's Law.
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Watts to Amps Calculator — DC, Single-Phase and Three-Phase
Convert watts to amps from power and voltage for DC, single-phase AC or balanced three-phase AC, with an explicit power-factor input for AC loads.
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Amps to Watts Calculator — DC, Single-Phase & Three-Phase
Convert current in amps to real power in watts for DC, single-phase AC or balanced three-phase AC with explicit voltage and power-factor inputs.
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kW to Amps Calculator — DC, Single-Phase & Three-Phase
Convert kilowatts to amps from voltage, system type and power factor for DC, single-phase AC or balanced three-phase AC.
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Electricity Cost Calculator — kWh & Energy Cost
Estimate energy use in kWh and simple electricity cost from device watts, hours per day, number of days and your own tariff per kWh.
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Power Factor Calculator — kW, kVA & kVAR
Calculate power factor from real power and apparent power, or derive kVA and reactive power from kW and a known power factor.
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kVA to Amps Calculator — Single & Three Phase
Convert apparent power in kVA to current using voltage and phase configuration, with separate balanced three-phase line-to-line and line-to-neutral voltage formulas.
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Three-Phase Power Calculator — kW, kVA, kVAR & Power Factor
Calculate balanced three-phase apparent, real and reactive power from line-to-line voltage, current and power factor, with phase angle shown for the simplified power triangle.
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VA to Watts Calculator — Apparent vs Real Power
Convert volt-amperes to watts or watts to VA using an explicit power factor, while keeping apparent power and real power separate instead of treating them as interchangeable.
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kW ↔ kVA Calculator — Real & Apparent Power
Convert kW to kVA or kVA to kW with an explicit power factor, plus a reverse check that keeps real and apparent power from being treated as the same quantity.
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Horsepower to Amps Calculator — DC, 1-Phase & 3-Phase
Convert electric horsepower output to estimated input current using voltage, efficiency, phase and power factor, with the input watts and assumptions shown beside the result.
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Ah ↔ Wh Calculator — Battery Charge & Energy
Convert amp-hours to watt-hours or watt-hours to amp-hours using battery voltage, with kWh and mAh equivalents and a reverse check on the same page.
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Battery Runtime Calculator — Wh/Ah, Load, DoD & Efficiency
Estimate battery runtime from Wh or Ah capacity, voltage, load, usable depth of discharge and conversion efficiency, while keeping ideal and adjusted runtime separate.
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Series & Parallel Resistor Calculator — Equivalent Resistance
Calculate equivalent resistance for up to four resistors in series or parallel, with reciprocal working shown and an optional source voltage for total current.
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Series & Parallel Capacitor Calculator — Equivalent Capacitance
Calculate equivalent capacitance for up to four capacitors in series or parallel, with the reciprocal relationship and optional stored-energy estimate from an entered voltage.
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Frequency ↔ Period Calculator — Hz, kHz, MHz, Seconds & More
Convert frequency to period or period to frequency with explicit Hz/kHz/MHz/GHz and s/ms/µs/ns units, reciprocal working, cycles-per-minute context and a reverse check.
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Joules ↔ Watt-Hours Calculator — J, kJ, MJ, Wh & kWh
Convert joules to watt-hours or watt-hours to joules using the exact 3,600 J per Wh relationship, with kJ, MJ, Wh and kWh equivalents plus visible reciprocal working.
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kWh ↔ MJ Calculator — Kilowatt-Hours & Megajoules
Convert kilowatt-hours to megajoules or megajoules to kilowatt-hours with the exact 1 kWh = 3.6 MJ relationship, plus joule, kilojoule and watt-hour equivalents.
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Transformer Turns Ratio Calculator — Solve Voltage or Winding Turns
Solve an ideal transformer for primary voltage, secondary voltage, primary turns or secondary turns from the other three values, with turns ratio, voltage ratio and ideal current-ratio context.
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Transformer kVA Calculator — Single & Three-Phase Current
Calculate transformer kVA from voltage and current or calculate ideal primary and secondary full-load current from a kVA rating, with single-phase and balanced three-phase formulas kept explicit.
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RC Time Constant Calculator — Solve τ, R or C + Cutoff & Timing
Calculate RC time constant from resistance and capacitance or solve backward for resistance or capacitance from a target tau, with five-tau settling, first-order cutoff and charge/discharge timing.
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LED Resistor Calculator — E12/E24 Value, Color Code & Power
Calculate a simple DC LED current-limiting resistor, round upward to E12/E24, recalculate actual current and power, and show the selected resistor’s standard 4-band color code.
Open calculatorUseful next calculations
Move to a different formula only when the next question actually changes.
Percentage Calculator
Calculate percentage change for measured or design values.
Ratio Calculator
Simplify decimal or integer ratios.
Electricity Cost Calculator
Move from power and runtime to kWh and an editable energy tariff.
Frequency ↔ Period Calculator
Move between frequency and period before timing or RC calculations.
Explore adjacent calculator collections
Cross-cluster links help you move from measurement to project quantity, electrical relationships, math or media planning without flattening everything into one giant list.
Measurement Calculators →
Work with tape-measure dimensions, drawing scales, area and unit conversions.
Construction & DIY Calculators →
Estimate area, concrete and tile quantities with visible assumptions and formulas.
Statistics Calculators →
Paste datasets to calculate descriptive statistics, sample/population spread and weighted averages with the formulas, conventions and row-level working kept visible.
Fraction Calculators →
Work with fractions, decimals, mixed numbers and practical inch fractions with the simplifying steps kept visible.
Geometry Calculators →
Solve right triangles, general triangles, circles, rectangles, perimeter, volume and slope from explicit dimensions and formulas.
Screen, Image & Video Calculators →
Plan pixel density, physical screen dimensions, aspect ratios, video bitrate and file size before resizing, converting or compressing media.
Formula first, assumptions visible
MAXScanner keeps editable rates and dimensions next to the result, shows the working where it helps, and avoids turning reciprocal formulas into duplicate pages. For product, electrical or construction decisions, manufacturer data, drawings and applicable standards remain authoritative.