Calculators: cron, timezones, money, deadlines, sleep

Calculators trade complex inputs for a clear answer. Cron expressions become English sentences. Time zones convert across multiple targets at once. Wedding cake tier sizes match guest counts using the standard Wilton serving chart. Freelance hourly rates back out from a target salary plus billable-hour reality. Gas costs multiply distance by consumption by price. Pizza counts adjust for adult-vs-kid mix and hunger level. Image dimensions translate between pixels, inches, centimeters, and DPI. Sleep cycle suggestions align with 90-minute REM cycles. Project deadlines skip weekends and US federal holidays.

Each calculator focuses on one clear question and answers it without ceremony. No accounts, no upsells, no advice surrounded by ads. The math runs locally; you can reload the page and keep working without losing context.

Inputs and assumptions are stated plainly so you can decide whether the calculation applies to your situation. The freelancer rate calculator is honest that overhead percentages vary by country; the wedding cake calculator notes that wedding-style cuts give more servings per tier than party-style. Where the math has limits (sleep cycles are an average, federal holidays do not include state holidays), the tool says so plainly.

These are estimates and aids, not professional advice. For load-bearing decisions (financial, medical, legal, contractual), confirm the math against authoritative sources or talk to someone whose job is to know.

All 9 tools in this category

Other categories

• Encoders, decoders, and validators (9 tools)
• Generators and converters (10 tools)
• Image and color tools (4 tools)
• AI-augmented (8 tools)

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