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Free Engineering Calculators

5 free engineering calculators - Ohm's Law, electrical load and MCB sizing, concrete mix design, beam deflection and wire cable sizing. No login required.

Ohm's Law Calculator

Calculate voltage, current, resistance or power using Ohm's Law. Enter any two values and instantly get the other two. Supports V, A, Ohm and W with unit multipliers.

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Electrical Load Calculator

Calculate electricity consumption (kWh) and monthly bill for your home or office. Add appliances with wattage and hours per day to get daily units, monthly units, bill estimate and required MCB rating.

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Concrete Mix Calculator

Calculate cement bags, sand and aggregate quantities for M15, M20, M25 and M30 concrete grades using IS 10262 nominal mix method. Enter volume in cubic metres and get full material requirements.

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Beam Deflection Calculator

Calculate maximum deflection and bending moment for simply supported and cantilever beams under UDL or point load. Checks deflection against IS 456 permissible limits (L/250, L/350).

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Wire & Cable Size Calculator

Find the right cable cross-section (mm2) for any electrical load. Enter current, material (copper/aluminium) and installation method to get IS 694 based recommendations with derating factors.

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Engineering Tools FAQ

Use our Electrical Load Calculator - add all appliances with wattage and hours. The tool shows total load, full load current, and recommends the correct standard MCB size (6A to 125A) based on a 1.25 safety factor. Also shows daily kWh, monthly units and estimated electricity bill.

For 1 m3 of M20 (1:1.5:3): dry volume = 1.54 m3, cement = 403 kg = 8.07 bags (50 kg each). Procure 9 bags with 10% wastage. Sand = 672 kg. Aggregate = 1209 kg. Use our Concrete Mix Calculator for M15, M20, M25 and M30 grades at any volume with optional cost estimation.

Simply supported beam with UDL: max deflection = 5wL4/(384EI), max moment = wL2/8. Our Beam Deflection Calculator covers all four cases (simply supported and cantilever with UDL or point load), shows IS 456 permissible limit check and marks the beam as Safe or Exceeds.

Full load current = 2000/230 = 8.7A. Design current (x1.25) = 10.9A. For copper cable clipped direct, 1.5 mm2 (15A) works, but 2.5 mm2 (20A) is safer for outlet circuits. In conduit use 2.5 mm2 (derated to 16A). Our Cable Size Calculator uses IS 694 tables with derating for installation method and cable material.