Calculators
Markup, pitch, time, seller fees, deck material, and local QR tools. Formulas sit next to the result.
Markup Calculator
Cost to selling price with markup or margin.
Roof Pitch Calculator
Rise and run to pitch, angle, and slope.
Military Time Converter
24-hour ↔ 12-hour with AM/PM.
Etsy Fee Calculator
Estimate listing, transaction, and processing fees.
Deck Material Calculator
Estimate decking boards and joists.
Deck Board Calculator
Estimate decking boards for a deck footprint.
Concrete Calculator Bags
Bags of concrete for a slab from L × W × thickness.
Wi‑Fi QR Code Generator
SSID and password to a scannable Wi‑Fi QR.
YAML to JSON
Paste YAML, get pretty JSON.
vCard QR Code Generator
Name and contact fields to a vCard QR.