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Every Calculation You Need, in One Place
Free, fast and reliable calculators for engineering, mathematics, physics and science.
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Popular calculators
The tools people need most.
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Civil Engineering
Concrete Volume Calculator
Concrete volume in cubic metres for slabs, footings and columns, with waste allowance, truck count and weight. -
General Calculations and Unit Conversion
Unit Converter (Engineering Units)
Convert length, pressure, temperature, power, energy, flow, torque and about 40 quantities. Type a value and see it in every unit in one table. -
Materials and Metallurgy
Linear Cutting Optimizer for Bars, Pipes and Profiles
Fits your cut list into stock lengths with minimum waste. Saw kerf, end trims, cutting sheet, reusable offcut list and CSV export. -
Fluid Mechanics
Flow Rate, Pipe Diameter and Velocity Calculator
Enter any two of flow rate, inside diameter and velocity to get the third. Q = v × A for a full circular pipe. -
Electrical and Electronics
Electrical Power, Current and Voltage Calculator (Single and Three Phase)
Find power, current, voltage or power factor for single and three phase AC. Active, apparent and reactive power together. -
Civil Engineering
Rebar Weight and Quantity Calculator
Rebar weight per metre, total length, kilograms and tonnes from rows of diameter, length and quantity, with a summary by diameter and CSV export. -
Steel Structures and Statics
Beam Deflection Calculator
Support reactions, maximum moment and maximum deflection for simply supported and cantilever beams under point or distributed load, with shear, moment and deflection diagrams. -
Geometry
Triangle Calculator: Sides, Angles, Area
Solves a triangle from three known values: remaining sides, angles, area, perimeter and altitudes, with a scale drawing and the two solution case. -
Mathematics
Percentage Calculator
Percent of a number, what percent one number is of another, percent increase and decrease, percent change and reverse percentage.
Categories
Calculators are grouped by field, then by topic.
- Mathematics 10 calculators
- Physics 7 calculators
- Chemistry 30 in the works
- Geometry 3 calculators
- General Calculations and Unit Conversion 1 calculator
- Mechanical Engineering 2 calculators
- Civil Engineering 2 calculators
- Electrical and Electronics 4 calculators
- Steel Structures and Statics 2 calculators
- Materials and Metallurgy 3 calculators
- Manufacturing, CNC and Welding 1 calculator
- Fluid Mechanics 3 calculators
- HVAC and Thermodynamics 1 calculator
- Energy and Renewables 56 in the works
- Environmental and Process Engineering 280 in the works
- Surveying and Geodesy 15 in the works
- Automotive and Vehicle Technology 224 in the works
- Aerospace 224 in the works
- Marine and Naval Engineering 280 in the works
- Geotechnics and Soil Mechanics 224 in the works
- Industrial and Production Engineering 392 in the works
- Automation and Robotics 280 in the works
- Statistics and Data Analysis 81 in the works
- Agricultural and Food Engineering 280 in the works
- Finance, Cost and Project Management 1 calculator
Recently added
The latest calculators.
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Mathematics
Integral Calculator
Compute definite integrals numerically with an error estimate and find antiderivatives symbolically. Every antiderivative is checked by differentiation. -
Mathematics
Derivative Calculator
Type a function and see its derivative step by step: sum, product, quotient and chain rules, a simplified result, the value at a point and a graph. -
Mathematics
Matrix Calculator
Matrix addition, multiplication, transpose, determinant, inverse, rank and Gaussian elimination. Exact fraction results with every row operation shown. -
Finance, Cost and Project Management
Material and Labour Cost Calculator
Builds a quote from material, labour and equipment lines with waste, overhead, profit and VAT, plus unit cost. Saved projects, CSV and print. -
Mathematics
Equation Solver
Type an equation and see the roots step by step: linear, quadratic and cubic, discriminant, complex roots, numeric roots and systems in 2, 3 or 4 unknowns. -
Geometry
Triangle Calculator: Sides, Angles, Area
Solves a triangle from three known values: remaining sides, angles, area, perimeter and altitudes, with a scale drawing and the two solution case.
For professionals
Site, workshop and office calculations: quantities, cutting, piping, electrical, structural.
For students
Mathematics, geometry and physics: calculators that show the formula and the working.