Geometry & Trade Math Calculators
Despite the name, this hub is less about pure geometry and more of a trade math toolbox — the everyday arithmetic that comes up across a job site, shop floor, or classroom rather than one specific industry. It covers estimating what a device costs to run, averaging results that don't carry equal weight, solving for a missing speed/distance/time value, working out a system of linear equations, and scaling a ratio up or down to a new batch size.
Geometry & trade math calculators
Right Triangle Calculator
Solve a right triangle from any two values — two sides, or a side and an angle — for the missing sides, angles, area, and perimeter.
Any 2 of sides/angles → all sides, angles, area
Electricity Cost Calculator
Estimate the running cost of an appliance or motor from its wattage, hours of use, and your electricity rate.
Watts, hours/day, rate → daily/monthly/annual cost
Weighted Average Calculator
Compute a weighted average from a list of values and their weights or quantities.
Values + weights → weighted average
Speed, Distance & Time Calculator
Solve for speed, distance, or time — enter any two known values to get the third.
Any 2 of speed/distance/time → the third
Linear Equation Solver
Solve a system of linear equations with up to eight variables instantly.
Coefficient matrix → variable values
Ratio & Proportion Calculator
Solve a ratio, or scale a recipe or mixture proportionally to a new batch size.
Known ratio + one new value → the missing value
Where this trade math actually gets used
These five calculators share one trait: each is a closed-form or trivially solved equation that people reach for constantly but rarely have memorized. An electrician or homeowner wants a running-cost estimate before buying a space heater or leaving a shop light on overnight; a quality inspector needs to average scores that don't all carry the same weight because batches came in different sizes; a driver, pilot, or logistics planner needs a fast ETA from a known distance and speed.
Ratio and proportion problems show up anywhere a recipe, mix, or formula needs to scale — a concrete mix, a cleaning-solution dilution, or a shop formula sized for a batch twice or half the original quantity, all without redoing every ratio by hand. Linear equation solving covers the same territory at a slightly larger scale, when two or more unknowns depend on each other simultaneously, such as balancing loads across circuits or splitting a mixture into more than two components.
None of this math needs a numeric solver or iteration — every one of these five tools is pure algebra, which is exactly why they're grouped together as a fast, no-frills trade math toolbox rather than five separate specialist tools.