Accurate calculators for makers, merchants and marketers
Free calculators and converters for print production, packaging, e-commerce and digital marketing — with visible formulas, units and assumptions.
Browse by category
Print & Design
Convert paper weights, check print resolution, calculate bleed and set up book covers, labels, barcodes, embroidery and specialty apparel printing.
10 tools available
E-commerce
Work out per-order profit and marketplace fees for Shopify and Etsy sellers.
3 tools available
Packaging & Logistics
Calculate dimensional (volumetric) weight, void-fill volume and pallet layer arrangements for shipping and warehousing.
3 tools available
Marketing
Find break-even ad spend, convert CPM/CPC/CTR ad metrics, estimate a fair influencer rate and track Amazon ACoS/TACoS.
4 tools available
Instagram Tools
Resize images, plan carousels, format captions and calculate Instagram performance in one practical toolkit.
2 tools available
PDF Tools
Merge, split and otherwise work with PDF files entirely in your browser — nothing you upload is sent to a server.
15 tools available
How calculations are verified
Formulas shown, not hidden
Every tool discloses the exact calculation, not just the result.
Assumptions stated explicitly
Default rates and rounding decisions are labeled, never presented as universal standards.
Dated, sourced data
Any preset rate carries a source and a review date, and is disabled if it goes stale.
Full policy: methodology and review policy.
Updates
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