Ferramentas de produtividade

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

Write Markdown and see a clean, rendered preview side by side.

Calculate monthly loan payments, total interest, and a full amortization schedule for any loan.

Convert length, weight, temperature, volume, area, speed, time, data, pressure, force, energy, power, torque, density, and flow rate units instantly. Metric and imperial. Free, browser-based.

Estimate calories burned during workouts and daily activities from your weight, duration, and activity intensity.

Add or remove sales tax from any amount — US state presets, custom rates, and instant totals.

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

Estimate the maximum property price you can afford from income, debts, rate, and term — plus a quick area × rate price check.

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.

Free multiple choice quiz practice tool — paste questions or use a sample quiz. One question at a time, score at the end, review mistakes.

Convert amounts between world currencies using live mid-market exchange rates.