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Free engineering calculators and student tools
Check a lap length, draw a beam’s bending moment diagram or work out concrete and steel. Merge and convert PDFs, count words and build references. Every calculator shows its working, and the file tools never upload your files.
- Concrete VolumeConcrete & materials
- Cement, Sand & AggregateConcrete & materials
- Rebar WeightConcrete & materials
- Stirrup & Bar Cutting LengthConcrete & materials
- Lap & Development LengthStructural
- Brick & BlockConcrete & materials
- Plaster & PaintConcrete & materials
- StaircaseStructural
- Beam CalculatorStructural
- Section PropertiesStructural
- Engineering Unit ConverterSurveying & site
- Slope & GradientSurveying & site
- Land Area from CoordinatesSurveying & site
- Earthwork & ExcavationSurveying & site
- Levelling (Rise & Fall)Surveying & site
- Open Channel Flow (Manning)Water & drainage
- Pipe Head LossWater & drainage
- Stormwater RunoffWater & drainage
- Bearing CapacityGeotechnical
- Retaining Wall StabilityGeotechnical
- Merge PDFPDF tools
- Split PDFPDF tools
- Compress PDFPDF tools
- PDF to ImagePDF tools
- Images to PDFPDF tools
- PDF to WordPDF tools
- Word to PDFPDF tools
- MP4 to MP3Images & media
- Image CompressorImages & media
- Image ConverterImages & media
- Word CounterWriting & study
- Citation GeneratorWriting & study
- GPA CalculatorWriting & study
- QR Code GeneratorImages & media
- AI Writing CheckerWriting & study
- Readability CheckerWriting & study
- Grammar & Spelling CheckerWriting & study
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Popular: Beam calculatorLap lengthMerge PDFWord CounterCitations
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- engineering calculators
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- student tools
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- design codes: EC2, ACI 318, AS 3600, IS 456
Browse tools by category
Eight groups, from concrete and foundations to PDFs and referencing.
Most used tools
Pick one and get an answer in seconds. No account, no watermark.
- Structural Beam Calculator Reactions, shear force, bending moment and deflection diagrams.
- Structural Lap & Development Length Lap and anchorage lengths to Eurocode 2, ACI 318, AS 3600 or IS 456.
- Concrete & materials Concrete Volume Slabs, footings, columns, beams, walls and stairs in m³ or yd³.
- Concrete & materials Cement, Sand & Aggregate Cement bags, sand and aggregate for nominal mixes like 1:2:4 and 1:1.5:3.
- Concrete & materials Rebar Weight Weight of reinforcing steel in kg, tonnes or lb, metric and US bars.
- Geotechnical Bearing Capacity Ultimate and allowable bearing capacity of shallow foundations.
- PDF tools Merge PDF Join several PDF files into one, in the order you choose.
- PDF tools Compress PDF Make a PDF smaller for email and upload limits.
- PDF tools PDF to Word Convert a PDF into an editable Word (.docx) file.
- Writing & study Word Counter Words, characters, sentences, reading time and keywords.
- Writing & study Citation Generator References in APA 7, MLA 9 and Harvard style.
- Writing & study GPA Calculator Semester and cumulative GPA, or percentage from marks.
Latest articles
New guides and study notes, most recent first.
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Pre-Pour Inspection Checklist: What a Site Engineer Checks Before Every Concrete Pour
A practical pre-pour inspection checklist for site engineers: drawings, formwork, reinforcement and cover, cast-in items, weather, concrete supply and testing,…
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Polar vs Non-Polar Covalent Bonds & Molecules
A polar bond is a covalent bond in which the electrons that form the bond are inequally distributed between two…
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Cold blooded vs Warm blooded animals: Definition, Differences & Examples
On the basis of regulating internal body temperature, there are two types of animals, that are Cold blooded animals and…
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Abiotic Factors- Definition, Examples, Abiotic vs Biotic
Abiotic Factors Definition Abiotic Factors are the non-living components in the environment which include all types of physical and chemical…
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Solute vs Solvent: Definition, Main Differences, Examples
A solute is a substance added to a solvent to form a solution. It exists in all three states i.e.:…
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Parts of Microscope with functions and labeled microscopes diagram
A microscope is an optical device that has one or more than one lens system that is used to get…
Browse guides by subject
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Engineering
Guides, worked examples and case studies across civil, structural and other engineering disciplines.
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Site Engineering
Inspection checklists and quality control for engineers working on construction sites.
See site guides →
Study Notes
Maths, physics, chemistry and biology explained with labelled diagrams and examples.
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How every article is made
Checked by an engineer
Engineering articles are written and checked by a civil engineer before they go live.
Sources listed
Standards, reports and references are listed at the end of every article.
Original diagrams
Key ideas get a diagram drawn for the article, not a generic stock photo.
Corrections welcome
If you spot an error, tell us. We check it and update the article.