How-To Guides
Step-by-step guides that teach you how to perform calculations manually.
How to Calculate Derivatives in Calculus: Step-by-Step Guide
Master calculus derivatives
Read guideHow to Calculate the Collatz Sequence: Step-by-Step Guide
Learn to calculate the Collatz sequence manually
Read guideHow to Calculate the Digit Sum and Digital Root: Step-by-Step Guide
Calculate digit sum and digital root manually
Read guideEuler's Totient Function: A Step-by-Step Guide
Calculate φ(n) manually
Read guideHow to Check if a Number is Perfect, Abundant, or Deficient: Step-by-Step Guide
Learn to classify numbers manually
Read guideHow to Convert Numbers Between Different Bases: A Step-by-Step Guide
Learn to convert numbers between bases 2-16 manually
Read guideHow to Calculate Divisibility: Step-by-Step Guide
Learn divisibility rules for 2-13
Read guideNumber Theory: A Step-by-Step Guide
Learn number theory basics
Read guideHow to Apply Number Theory: Step-by-Step Guide
Learn number theory basics
Read guideHow to Calculate Great-Circle Distance: A Step-by-Step Haversine Guide
Calculate distance between GPS coordinates manually
Read guideTriangle Solver: Step-by-Step Guide
Solve any triangle given 3 known values
Read guideHow to Calculate Trigonometric Values on the Unit Circle: Step-by-Step Guide
Learn to calculate trig values manually
Read guideHow to Calculate Arctan: Step-by-Step Guide
Learn to find angles using inverse tangent
Read guideHow to Calculate Arccos: Step-by-Step Guide
Learn to find angles from cos values
Read guideHow to Calculate Arcsin: Step-by-Step Guide
Learn to calculate arcsin manually
Read guideHow to Calculate Tangent: Step-by-Step Guide
Calculate tan(θ) manually
Read guideHow to Calculate Cosine: Step-by-Step Guide
Calculate cosine manually
Read guideHow to Calculate Sine: Step-by-Step Guide
Learn to calculate sine manually
Read guideHow to Visualize Trig Function Graphs: Step-by-Step Guide
Learn to visualize trig graphs manually
Read guideHow to Calculate Inverse Trig Functions: Step-by-Step Guide
Learn inverse trig functions
Read guideHow to Calculate Trigonometric Ratios: Step-by-Step Guide
Learn to calculate sin, cos, tan by hand
Read guideHow to Calculate Trig Functions Manually: Step-by-Step Guide
Manual trig calculations made easy
Read guideHow to Calculate Trigonometry: Step-by-Step Guide
Learn trigonometry manually
Read guideBox Volume Calculator: Step-by-Step Guide
Calculate box volume manually
Read guidePool Volume Calculator: Step-by-Step Guide
Calculate pool volume in litres and gallons
Read guideHow to Calculate Pipe Volume: Step-by-Step Guide
Calculate pipe volume manually
Read guideHow to Calculate Tetrahedron Properties: Step-by-Step Guide
Calculate tetrahedron volume and surface area manually
Read guideHow to Calculate Octahedron Properties: Step-by-Step Guide
Calculate octahedron properties manually
Read guideHow to Calculate the Volume and Surface Area of a Hexagonal Prism: Step-by-Step Guide
Calculate hexagonal prism volume and surface area manually
Read guideHow to Calculate the Volume and Surface Area of a Pentagonal Prism: Step-by-Step Guide
Calculate volume and surface area of a pentagonal prism
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