Carpenter

Board Feet Calculator

Lumber math by board feet — qty × thickness × width × length, with $/bf totals. Multiple boards in one calc.

Unit Converter

Convert between temperature, weight, length, volume, speed, and data units.

Tap Drill Chart

UNC, UNF, and ISO metric tap-drill sizes at 75% thread engagement.

Number Base Converter

Convert between decimal, binary, octal, and hex.

Quote Generator

Create professional quotes for your clients. Drag to reorder line items, see a live summary, save as draft or convert straight to an invoice. Numbered, in-browser, all on your device.

Invoice Generator

Create professional invoices for your small business. Drag to reorder line items, see live totals, save as draft, mark as paid and issue a receipt in one click.

Receipt Generator

Quick receipts for cash, card, and bank-transfer payments. Drag-handle line items, live cash-change calculation for walk-ins, save customers for next time.

Percentage Calculator

Calculate percentages, increases, decreases, and changes.

Compound Interest Calculator

Calculate investment growth with compound interest over time.

Discount Calculator

Calculate sale prices and how much you save.