All tools
151 tools available
Savings Calculator
Project your savings growth with regular deposits and compound interest.
Roofing Calculator
Estimate roofing squares and shingle bundles needed from roof dimensions.
Slope Grade & Ratio Calculator
Turn rise and run into slope ratio, percentage grade, and angle — for algebra homework, ramps, roofs, roads, and drainage. Free, instant, works on your phone.
PDF Password Remover
Unlock your own password-protected PDFs — enter the password once, download an unlocked copy.
Fuel Economy Calculator
Calculate MPG or L/100km from distance travelled and fuel used.
Long Division Calculator
Divide two numbers and see the quotient and remainder step by step.
WebP to JPG / PNG Converter
Convert WebP images to JPG or PNG — in bulk, free, in your browser, from files or an image URL.
Protein Calculator
Calculate your daily protein needs from body weight and activity goal.
Number to Roman Numeral Converter
Convert numbers to Roman numerals, or Roman numerals back to numbers.
Amortization Schedule Calculator
Generate a full month-by-month loan amortization schedule.
BMR Calculator
Estimate your Basal Metabolic Rate and daily calorie needs by activity level.
Concrete Calculator
Estimate cubic yards of concrete needed for a slab, and how many bags.
Number to Words Converter
Convert numbers to words — international & Indian (lakh/crore) systems, plus amount in words for rupees & dollars.
Convert Image to WebP
Convert JPG, PNG, GIF or any image to WebP — in bulk, with live previews, resize, crop, and color filters. Free, in your browser, from files or an image URL.
Quadratic Formula Calculator
Solve ax² + bx + c = 0 for real or complex roots.