Productivity Tools

Estimate body fat percentage using the US Navy circumference method with neck, waist, and hip measurements.

Plan daily protein, carbs, and fat from your calorie target or estimated needs, with per-meal macro splits.

Calculate restaurant net profit, food and labor costs, prime cost ratio, and profit margins from sales and operating expenses.

Calculate time differences and add or subtract hours, minutes, and seconds from any clock time.

Perform basic and scientific calculations with trigonometry, logarithms, powers, and degree or radian mode.

Calculate tip amount, total bill, and fair split per person with quick percentage presets.

Create professional invoices with line items, tax, and totals — preview, print, or download as PDF.

Create printable sales receipts with items, tax, payment details — preview, print, or download as PDF.

Create professional price quotations with line items, tax, and validity dates — preview, print, or download as PDF.

Generate product SKU codes from brand, category, product, color, size, and variant fields with custom separators and sequences.

Calculate heart rate training zones with Karvonen or % max HR — 3 or 5 zones from age, resting HR, and max HR formulas. Free, instant, browser-based.

Calculate basal metabolic rate (BMR) with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle — compare formulas and TDEE estimates. Free, instant, browser-based.