Math & Converters

Calculators and unit converters for everyday math problems.

9 free tools · No sign-up required · Runs in your browser

Percentage Calculator

Calculate percentages, percentage change, and percentage of a total.

Convert between metric and imperial units instantly.

Convert between world currencies using live exchange rates.

Calculate your Body Mass Index from height and weight.

Calculate exact age in years, months and days from a birth date.

Calculate proportional dimensions for any aspect ratio.

Convert between pixel and rem CSS units instantly.

Calculate the final sale price and total savings from a discount.

Calculate ad revenue, CPM, or required impressions for a target earnings.

JSON, encoding, hashing, formatting and other everyday tools for developers.

Meta tags, sitemaps, schema markup and other tools to help your site rank.

Compress, convert, resize and edit images entirely in your browser.

Count, clean, convert and compare text instantly.

Merge, split, compress and convert PDF files without uploading them anywhere unsafe.

Prompt builders and content generators to speed up your writing workflow.

Pick colors, build gradients, shadows and check accessibility contrast.

Generate strong passwords and hashes without sending your data anywhere.