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Effective hourly rate on a retainer, explained: the formula that shows when a client stops paying

A monthly retainer has a contracted rate (fee ÷ hours included) and an effective rate (fee ÷ hours actually used). The contract shows the first. Your margin depends on the second. The formula effectiv

3 min readbardachtech.hashnode.dev

Sebastian Bardach21h ago

The freelance hourly rate formula, explained: one division and the input that moves it most

A freelance hourly rate is one division: the revenue you need over a year, divided by the hours a client will actually pay for. Both halves have a trap, and the second one is where most rates go wrong

3 min readbardachtech.hashnode.dev

Zayed2d ago

Reverse sales tax: how to find the pre-tax price from a receipt total (with JavaScript)

Disclosure: I'm Zayed and I build ClearCalc Tools, a free calculator site. This post explains the math behind one of its features. A very common mistake when you want the price before tax is to subtra

2 min readclearcalc-notes.hashnode.dev

FightNome3d ago

Random calls on a beat grid: the arithmetic of 6 to 45 calls per minute at 74 to 128 BPM

I build FightNome, a boxing and Muay Thai training app, and this note comes from working on one of its modes. FightNome has two striking modes. In combo mode the coach repeats a combination you built.

4 min readfightnome.hashnode.dev

CalcHub Tools3d ago

Voltage drop, explained with code: why your 100-foot extension run needs thicker wire

Ohm's law, a resistance table and one line of JavaScript explain voltage drop. Here's how to calculate it, why the 3% guideline exists, and how to pick a wire gauge for long runs.

4 min readcalchubtools.hashnode.dev

Ravi Patel4d ago

A Numerically Stable Quadratic Solver in Python (with Steps)

Most "quadratic formula" snippets online stop at two lines of code. That is fine until you hit a negative discriminant, a = 0, or floating-point noise that turns a double root into two slightly differ

3 min readravi-numerics.hashnode.dev

Urban Mixo5d ago

How Does a Grade Calculator Work? The Linear Algebra of Weighted Scoring and Final Exam Targets

A mathematical breakdown of weighted syllabus equations, credit-hour quality points, and exam target prediction algorithms in vanilla JavaScript.

9 min readurbanmixo.hashnode.dev

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Urban Mixo5d ago

From Formula to Pixels: Building a 60 FPS Mathematical Graphing Engine on HTML5 Canvas in Pure JavaScript

How we solved safe algebraic evaluation without eval(), world-to-screen coordinate mapping, and asymptote discontinuity handling in under 100 lines of code.

9 min readurbanmixo.hashnode.dev

CalcHub Tools5d ago

Sizing a solar array from your electric bill: the math, in a dozen lines of JavaScript

How to turn monthly kWh into a system size and a panel count, what 'peak sun hours' really means, and the derate factor most quick estimates leave out.

4 min readcalchubtools.hashnode.dev

Sigma Calculator6d ago

How a Car Loan Calculator Works — The Math Behind Your Monthly Payment

You type four numbers into a car loan calculator — price, down payment, interest rate, term — and it instantly tells you the monthly payment. No magic. Just one formula, written in 1676, doing exactly

3 min readsigmacalculator.hashnode.dev

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