Free online calculators, converters and text tools - fast, private, ad-light and built for every device.
Tip: every tool runs in your browser. Bookmark the page you need and use it as many times as you like.
Plan loans, mortgages, savings, retirement and budgets with fast calculators that run locally.
Calculate ages, count days, find weekdays and measure time durations accurately across time zones.
Count words, convert case, generate random text, validate data and clean up any list.
Convert between metric and imperial units, temperatures, file sizes and screen dimensions instantly.
Calculate percentages, fractions, averages, grades, random numbers and times tables.
Track BMI, calories, body fat, ideal weight and pregnancy milestones with private on-device maths.
Plan study hours, GPA, credit progress, test scores and study schedules with local, private calculators.
Estimate paint, wallpaper, flooring, decking, concrete and lumber - plus roof pitch and window savings.
Set freelance rates, track billable hours, plan taxes and price products with privacy-friendly tools.
ToolKit Online is a collection of fast, accurate calculators and converters that respect your privacy. Every page is a self-contained tool with no accounts, no email collection and no third-party trackers. The maths runs entirely in your browser, which means your numbers stay on your device.
Every page is fully responsive. On a phone the layout stacks, the touch targets are large and the inputs are optimised for number pads. On a tablet and desktop the side panels and reference tables sit alongside the calculator so the result and the explanation are visible at the same time.