EngCalc

Free Engineering Calculators

Solve a beam with any supports and loads and read its shear, moment and deflection, check a section or a column against IS 800, Eurocode 3 or AISC, plan stairs to the building code, size a pipe, a pump or a tank, choose a cable and its breaker, and read resistor and capacitor codes. In SI or US units, worked out in your browser, with nothing you type uploaded.

Help guideFAQ

Units: SI (metres, newtons, pascals)Everything stays in this browser.

All the calculators

Twenty-eight calculators for structures, building sites, pipes and machines, wiring and circuits. Answers change as you type, every box takes any unit, and each answer shows how it was worked out.

Shortcuts, outside a text box: 1 to 6 open All and the five kinds, / finds a calculator, U switches SI and US units and ? opens the help.

How to Use EngCalc: Step-by-Step

1

Pick a calculator

Open a kind with the tabs, or search All for a word such as beam, cable, pipe or resistor. Press / to find one from anywhere in the tool, and star the ones you use so they come first.

2

Choose SI or US units

The switch above the tabs sets metres, newtons and pascals or feet, pounds and psi, and converts what you typed. Each box also has its own unit list, and you can type a unit after any number.

3

Type what you know

Every calculator opens with example values. Type over them: lengths as 12'6", sums as 2*450 + 30, parts as 4k7. Under each box you see what was understood, and the answer changes as you type.

4

Read the answer and the checks

The main answer is at the top with the other results under it. Green, amber and red notes compare it with the usual limits and the codes, and the drawing shows the beam, the stairs or the tank to scale.

5

See how it is worked out

Open "How it is worked out" for each formula with your numbers in it. On the beam's diagrams, point or use the arrow keys to read the shear, moment and deflection anywhere along it.

6

Share, copy or print

Share makes a link that opens the calculator with your numbers, Copy puts the numbers and the answer on the clipboard, and Print makes a clean sheet. Reset brings the example values back.

Why Use EngCalc?

🏗️ Any beam, not just the textbook ones

Supports anywhere, overhangs and continuous spans, point, spread, varying and moment loads together, with the reactions and the shear, moment and deflection along the whole beam.

📐 Checked against the codes

Columns by IS 800, Eurocode 3 and AISC 360, cables by IEC 60364 and the US NEC, stairs by India's NBC 2016, the IRC, the IBC and Part K, each named where it is used.

🔁 SI and US side by side

Metres or feet and inches, newtons or pounds, pascals or psi, litres or gallons. One switch converts every box, and each answer also shows the other system.

🧾 Every step shown

Nothing is a black box: each answer lists the formulas with your numbers in them, so the result can be checked by hand or taken into a report.

✍️ Typical figures marked

Pipe roughness, a liquid's viscosity, an LED's forward voltage or how much soil swells differ in real life. EngCalc says when a figure is typical and lets you type your own.

🔒 Nothing uploaded

Everything is worked out in your browser and kept in this browser on this device. Delete everything, in the Help window, removes it.

Engineering Calculations Explained

🪵 Moment, shear and sag

A beam carries its loads by bending. The bending moment sets the stress in it (moment divided by the section modulus), the shear sets the stress in the web, and the sag is usually kept under the span divided by 250 to 360 so floors and finishes do not crack.

🏛️ Why columns buckle

A slender column bows sideways and fails long before the steel is crushed. Euler's load gives the limit for a perfect column; the codes lower it with buckling curves for the bends, welds and stresses left in real sections.

🔌 Heat and voltage drop

A cable is sized twice: for heat, so the insulation stays within its temperature with the air around it and the circuits beside it, and for voltage drop, so the far end still gets enough volts. The bigger of the two wins.

Frequently Asked Questions

Is EngCalc free, and is anything I type uploaded?

It is free, with no registration and no limit. Like every page on ZeroDataUpload, it is supported by advertising. The numbers you type are worked out by your browser on your device and never sent to a server. They are kept in this browser's storage so they are there next time; Delete everything, in the Help window, removes them.

How does the beam calculator work?

It takes any straight beam with pinned, roller and fixed supports anywhere and point, spread, varying and moment loads. The reactions come from beam elements with a node at every support and load, the shear and moment from balancing the forces left of each point, and the deflection from hundreds of short elements, so the results are those of an elastic beam. It is a check for planning and learning, not a structural design: anything that carries people needs a design by a qualified engineer under your local code.

Which codes does EngCalc follow?

Column strength by IS 800:2007, EN 1993-1-1 and AISC 360-16; cable ratings by IEC 60364-5-52 and the US NEC Table 310.16 (2023); stairs against India's National Building Code 2016, the US IRC and IBC and the UK's Approved Document K; Indian steel beams from IS 808:1989; PCB traces by IPC-2221. Typical figures, such as pipe roughness or a liquid's viscosity, are marked typical and can be replaced by your own.

How is the cable size chosen?

EngCalc takes the smallest size whose rating, after the corrections for air temperature and for circuits or wires run together, carries the current, and whose voltage drop over the length stays within your limit. The breaker sits between the load current and the cable's rating. Aluminium on the IEC sizes is an estimate at 75% of copper, on the safe side; check the cable maker's table before you buy.

Can I type feet and inches, or values like 4k7?

Yes. Every box takes a unit after the number (25 mm, 3.5 kN, 12 kN/m), feet and inches (12'6"), fractions (1 1/2 in), sums (2*450 + 30) and the shorthand printed on parts (4k7, 2R2, 100n). The SI and US switch converts every box between metres, newtons and pascals and feet, pounds and psi.

Where are concrete, cement and bricks?

They are worked out in HomeCalc, our home and property calculators, in its Cement and bricks tab: concrete by the nominal mixes of IS 456 with the water the standard allows, bricks and blocks with their mortar, and plaster. EngCalc's Building tab has a link that opens it.

Can I share or print a result?

Share makes a link that opens the calculator with your numbers; they ride in the part of the link after #, which the browser never sends to a server, and the page takes them out of the address as it opens. Copy puts the numbers and the answer on the clipboard, and Print makes a clean sheet with the drawing and how it was worked out.

How EngCalc works

Twenty-eight calculators for engineers, builders, electricians and makers. Answers change as you type; there is nothing to press. What you type is kept in this browser for next time and never sent anywhere.

Typing numbers

Every box has its own unit list, and changing the unit keeps the size: 6 m becomes 6000 mm. You can also type a unit after the number (25 mm, 3.5 kN, 12 kN/m), feet and inches (12'6", 6' 4 1/2"), fractions (3/8, 1 1/2 in), sums (2*450 + 30) and the shorthand printed on parts (4k7, 2R2, 100n). Under the box you see what was understood. The SI and US switch (or U) changes every calculator between metres, newtons and pascals and feet, pounds and psi, and converts what you typed.

The answer

The main answer is at the top, with the other results below it. Green, amber and red notes check the result against the usual limits and the codes. "How it is worked out" shows each formula with your numbers in it. Share gives a link that opens the calculator with your numbers (they stay in the part after #, which is never sent to a server); Copy puts the numbers and the answer on the clipboard; Print makes a clean sheet. The star keeps a calculator in your favourites at the top of All.

Beams

The beam calculator solves any straight beam: pinned, roller and fixed supports anywhere, overhangs and continuous spans, point loads, spread and varying loads and moments. Loads are downward when positive and moments clockwise. It splits the beam into hundreds of short elements with a node at every support and load, so the reactions, shear, moment and deflection are those of an elastic beam (to within rounding, a few parts in 100,000). Point at the diagrams, or use the arrow keys on them, to read the values anywhere. It is a check for planning and learning, not a structural design.

Codes and figures

Column strength follows IS 800:2007, EN 1993-1-1 and AISC 360-16; IS 800 has the buckling curves a to d, so curve a0 is used only for Eurocode. The ISMB beams are those of IS 808:1989, which IS 808:2021 has replaced: check the mill's table. Cable ratings for copper are those of IEC 60364-5-52 and the US NEC Table 310.16 (2023), with corrections for air temperature and grouping; aluminium on the IEC sizes is estimated at 75% of copper. Stairs are checked against India's National Building Code 2016 (at most 12 risers a flight, 2.2 m headroom), the US IRC and IBC and the UK's Part K. Pipe roughness, fitting losses, liquids other than water and air, LED forward voltages and soil swell are typical figures; each has a choice for your own value. Motors are the standard sizes of IEC 60072-1 and India's IS 12615.

Concrete, cement and bricks

These are worked out in HomeCalc, our home and property calculators, in its Cement and bricks tab, by the nominal mixes of IS 456. The Building tab here has a link to it.

Keyboard

1 to 6 open All and the five kinds, / finds a calculator, U switches SI and US units and ? opens this help (outside a text box). ← and → move between the tabs and along the beam's diagrams.

Your numbers

Everything stays in this browser on this device. Delete everything puts every calculator back to its example values, clears your favourites and removes EngCalc's data from this browser; the rest of the site is left alone.

These calculators help with planning, checking and learning. For anything that carries people or power, have the design checked by a qualified engineer and follow your local code.