What These Maths Calculators Cover
This collection covers the practical maths problems that come up most often for students, teachers, tradespeople, and anyone working with real measurements. The tools are grouped into geometry, volume, conversions, and general number problems. Each one shows the formula it uses, applies it to your inputs, and walks through the steps so you can follow and verify the working yourself.
Geometry and Triangles
The Triangle Calculator solves any triangle from any combination of known sides and angles using SSS, SAS, ASA, AAS, and SSA rules. It finds missing sides, angles, area, height, and perimeter, and handles right triangles with the Pythagorean theorem as a special case. The Slope Calculator takes two coordinate points and returns the slope as a fraction, a decimal, a percentage, and an angle in degrees, which covers roof pitch and ramp gradient problems as well as coordinate geometry. The Distance Calculator works in 2D, 3D, and latitude-longitude mode, and also covers the speed-distance-time formula for problems that involve rate and time.
Volume Calculators
The Volume Calculators collection has a dedicated tool for each common 3D shape: sphere, cylinder, cone, cube, pyramid, capsule, ellipsoid, frustum, and rectangular tank. Every tool shows the standard formula, applies it step by step, and converts the result to liters, gallons, and cubic feet automatically. These are used for everything from school geometry homework to sizing tanks, estimating concrete, and checking product dimensions in manufacturing.
Percentages and Ratios
The percentage tools handle the four most common percentage problems in a single page each. The Percentage Calculator finds what percent one number is of another, calculates X percent of a value, and works out percentage difference. The Percentage Increase Calculator and Percentage Decrease Calculator handle salary rises, price drops, year-over-year changes, and reverse calculations where you know the percentage and need the original value. The Aspect Ratio Calculator finds the ratio from any width and height and scales dimensions proportionally for screen resolutions, print sizes, and photo crops.
Time and Concrete
The Time to Decimal Calculator converts hours, minutes, and seconds to a decimal number and back, which is the standard format for payroll, timesheets, and Excel time calculations. The Work Hours Calculator totals hours worked from clock-in and clock-out times with break deductions, and optionally multiplies the result by an hourly rate. The Concrete Calculator estimates volume in cubic yards for slabs, footings, columns, driveways, and post holes, then converts to bags and an optional cost estimate based on the bag price you enter.
Who Uses These Tools
These calculators are used by secondary and university students checking homework and exam working, teachers preparing examples with known correct answers, construction workers and tradespeople estimating materials, and professionals who need a fast geometry or percentage check without opening a spreadsheet. The step-by-step working on each page is written to be readable, not just technically correct, so the answer makes sense rather than just appearing.