免费在线工具
268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Discount Calculator
Calculate sale price, savings, and discount amount from percentage or fixed discounts.
Used 0 times•Updated never
Break Even Calculator
Find how many units or how much revenue you need to cover fixed costs and break even.
Used 0 times•Updated never
Sales Tax Calculator
Add or remove sales tax from any amount — US state presets, custom rates, and instant totals.
Used 0 times•Updated never
Salary Calculator
Convert salary between annual, monthly, weekly, biweekly, daily, and hourly pay with optional tax estimates.
Used 0 times•Updated never
Freelancer Rate Calculator
Calculate the hourly, daily, and project rates you need to hit your income goals after taxes, expenses, and non-billable time.
Used 0 times•Updated never
Timesheet Calculator
Log daily work hours from clock times or direct entries, then calculate weekly totals, overtime, and gross pay.
Used 0 times•Updated never
Expense Tracker
Log daily expenses by category, see spending totals, and review a breakdown — saved in your browser.
Used 0 times•Updated never
ROI Calculator
Calculate return on investment (ROI), net gain, and annualized ROI from your initial investment and returns.
Used 0 times•Updated never
Calories Calculator
Estimate calories burned during workouts and daily activities from your weight, duration, and activity intensity.
Used 0 times•Updated never
Nutrition Calculator
Convert between macronutrient grams and calories, or split a calorie target into protein, carbs, and fat.
Used 0 times•Updated never
Water Intake Calculator
Estimate your daily water needs from body weight, activity level, climate, and exercise duration.
Used 0 times•Updated never