Halloween party budget without invented shop prices
A useful cost sheet that separates supplied prices from estimates and unknowns. Paste this prompt into ChatGPT, Gemini, Claude or Grok, change the parts in brackets to suit you, and generate.
- Written for
- ChatGPT, Gemini, Claude, Grok
- Occasion
- Halloween · 31 Oct
- Status
- Tested 9 Oct 2026 in Grok, 9 Oct 2026 (one run; model id not exposed)
- Test settings
- The page's exact default prompt was run once in Grok on 9 Oct 2026. The default details already written on the page were the input. They are illustrative, not a record of a real event. ChatGPT and Gemini were not used. The first result was kept.
- Variability
- A different set of details, or another run, will change the wording. This is the first result for the defaults on this page.
Prompt
Build a budget worksheet for a Halloween gathering. Spending cap/currency: 100 CAD Guests and categories: 10 adults; snacks, decorations and quiz prizes Quotes or prices I have: snacks: 30 CAD total; decorations: 20 CAD total Use only the details I supply. Ask for essential missing information rather than inventing it. Label suggestions as ideas, not facts or confirmed bookings. Do not invent prices, people, schedules or offers. Give category | quantity assumption | supplied unit cost or ? | calculable subtotal or ?. Calculate only from supplied figures, showing the arithmetic. Separate must-haves and optional spending. Do not use invented store prices to make the budget look complete. Show known total, remaining allowance and questions for unpriced items. Suggest reductions by priority, not unsupported savings percentages. Treat a supplied category total as a total, not a unit price to multiply by guest count. Keep unknown quantities, prices, taxes and fees marked ?. The cap minus the known subtotal is only an unallocated allowance, not confirmed spare money: unpriced essentials still need funding. If currencies differ or the cap is missing, ask before comparing totals; do not invent an exchange rate.
Customise
For example: 100 CAD.
For example: 10 adults; snacks, decorations and quiz prizes.
For example: snacks: 30 CAD total; decorations: 20 CAD total.
Fields start with illustrative values; replace them with your own facts. The prompt updates as you type. Copy prompt copies your version.
Example output
Actual tested output. The notes used for this result are an example, not a real event. This box is not copied. Replace the notes above with your own before you paste the prompt.
Budget worksheet. Figures below are only the ones you supplied. Suggestions are ideas, not bookings or shop quotes. Guest count is 10 adults. Currency is CAD. Cap is 100 CAD. category | quantity assumption | supplied unit cost or ? | calculable subtotal or ? Snacks | 10 adults. Your figure is a category total, not a unit price, so it is not multiplied by 10. | 30 CAD total | 30 CAD Decorations | item count not supplied. Your figure is a category total, not a unit price. | 20 CAD total | 20 CAD Quiz prizes | quantity ? | ? | ? Arithmetic Snacks subtotal = 30 CAD, the supplied total. Decorations subtotal = 20 CAD, the supplied total. Known subtotal = 30 + 20 = 50 CAD. Cap minus known subtotal = 100 - 50 = 50 CAD. That 50 CAD is an unallocated allowance, not confirmed spare money. Quiz prizes are still unpriced. If you keep them, they still need funding. Taxes and fees were not supplied and stay ?. Must-haves: snacks, because they are the priced food for the gathering (30 CAD). Planned and priced: decorations (20 CAD), if that quote still stands. Optional until you decide otherwise: quiz prizes. Price ?. The plan is not called within the 100 CAD cap. An unpriced prize spend is still open. If a prize quote is higher than the 50 CAD allowance, reduce by priority, not by a savings percentage: 1. Cut quiz prizes first. They are the optional, unpriced line. 2. Then lower decorations below the 20 CAD you already quoted, only by choosing a smaller set. 3. Keep the 30 CAD snacks. Questions for unpriced items - What is the quiz-prize total in CAD, and are prizes required or optional? - Do the 30 CAD and 20 CAD totals already include tax or any fee? - Is there any other cost category? None was supplied.
How to use it
- Open ChatGPT, Gemini, Grok or Claude.
- Paste the prompt and replace the [BRACKETS] with your details.
- Review names, facts and the requested format; follow up with corrections or missing details.
How to use this prompt
- Fill Customise with your real details. Do not let the tool guess a missing fact. Write the missing information clearly if you need to.
- Press Copy prompt and paste it into the AI app named above. This page copies the prompt. The answer is created in the external app.
- Check names, facts, numbers, language and the format you asked for. If something is wrong or incomplete, ask for a correction.
Good to know
- Confirm all arithmetic, taxes and actual vendor prices. This is a planning worksheet, not financial advice. Run once in Grok on 9 Oct 2026 using the illustrative defaults on this page. Check the draft against your own facts before you use it.
- Check facts before you rely on the answer.
