#calculator
5 discoveries · Hand-picked discoveries from the open web, newest first.
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Show HN: A trim size and margin calculator for self-published books
Pick a trim size and page count: see which printers list it, the page size to set, KDP minimum margins, spine width and full cover size. Free, no sign-up.
Show HN · EN
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Show HN: FetchIndex – cost calculator for 19 scraping and search APIs
Free calculator: estimate the monthly cost of 21 scraping, SERP and AI search APIs for your volume from published pricing tiers. Prices verified 2026-11-09.
Show HN · EN
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Show HN: Mercury 3 cost calculator (launch promo vs. list pricing)
Estimate your Mercury 3 API bill: compare launch promo ($0.10/$0.35) vs list pricing ($0.20/$0.70) per 1M tokens, with cached-input savings.
Show HN · EN
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Show HN: Business days calculator that shows which days it skipped
Count working days between two dates or add business days to a date. Skips weekends and US federal or UK bank holidays. Free, no sign-up.
Show HN · EN
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The most impractical calculator in the world only has two buttons
Modern calculators have many buttons, including ones for sine, square root, pi and exponents. But it’s possible just two could suffice
Scientific American · EN