What’s inside

One SKILL.md (the playbook) + one starter template. A preview:

Calculation to Return

When to use

• Showing return on investment: cost in, gains out, one final ROI or payback figure
• Breaking down a savings claim (old cost minus new cost, step by step, to the amount saved)
• Explaining a pricing total where each line item adds up to a final price
• Walking through loan, mortgage, or subscription math where the audience needs to trust each step
• Comparing two options numerically, each resolving to its own final figure before the verdict
• Debunking or verifying a headline number by showing the arithmetic behind it

Workflow

1. Write the arithmetic as a line-by-line script (input: your numbers → output: calculation script with inputs, steps, and final figure)
   Lay out the full calculation before animating: the inputs (each with its label, value, and unit), the steps in order (each one operation: add, subtract, multiply, divide, or percentage), and the final return figure. Every step must show its own result — never jump from inputs to answer. Round consistently (e.g. whole dollars, or two decimals throughout) and keep units on every number: "$4,200/yr" not "4200". If a step needs an assumption ("assumes 12% churn"), write it as a footnote line in the script, not hidden.
2. Stage the inputs (input: calculation script → output: input keyframes)
   Open with the inputs laid out as a clean column or row, each fading or sliding in over 0.3 seconds, staggered 0.15 seconds apart, ease-out. Inputs sit in a quieter style (smaller, lighter weight) than the steps that follow — they are the givens, not the story. Hold the full input set for 1 second so the viewer can orient before the math starts.
3. Animate each step, one operation at a time (input: inputs → output: per-step keyframes)
   Reveal one step at a time: the operation line appears (0.3 s fade/slide, ease-out), the numbers resolve into that step's result over 0.5–0.8 seconds with a count-up or count-down, then a 0.5-second hold. The count animation is the heart of the pattern — use ease-out so the number decelerates into its final value, and make sure it lands exactly on the true result, never a rounded-off near miss. While one step animates, all previous steps stay visible but dimmed to ~60% opacity, and future steps stay hidden.

Template preview

Calculation to Return — Animation Spec Template

Fill in the full arithmetic before animating. One operation per step; every step shows its result.

Calculation: {title — e.g. "Annual savings from switching plans"}

Canvas: {1920×1080 / 1080×1080 / 1080×1920} | Frame rate: 30 fps | Export: H.264 Rounding rule: {whole dollars / two decimals — same rule throughout} Units: {every number carries its unit, e.g. $/yr}

Inputs (the givens — quieter style, staggered in)

Input stagger: 0.3 s each, 0.15 s apart, ease-out | Hold with all inputs visible: 1 s

Steps (one operation each, in order)

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