Practical guidance on development, online stores and the tools that help your business work better.
Tag: free tools
A browser barcode scanner decodes EAN-13, UPC-A, Code 128 and QR codes from a camera, a photo or a screenshot — no app to install. This guide covers the three routes and the troubleshooting ladder for codes that refuse to read.
Asad · Oct 18, 2026 Read article →Daily calories start with BMR from the Mifflin-St Jeor equation, multiplied by an activity factor for TDEE: our worked man's BMR is 1,755 kcal and sedentary maintenance about 2,106 kcal. Estimates only — the guide explains the honest limits.
Asad · Oct 18, 2026 Read article →An aspect ratio is width and height divided by their greatest common divisor: 1920 x 1080 is 16:9, and resizing keeps the pair constant (width 1280 needs height 720). This guide also shows why 2560 x 1080 is honestly 64:27.
Asad · Oct 18, 2026 Read article →The difference between two dates counts the days from start to end, start day excluded: 15 January 2026 to 18 October 2026 is 276 days. This guide shows the month-by-month counting, the leap-day trap and deadline use.
Asad · Oct 18, 2026 Read article →Time duration is subtraction with borrowing in sixties: 09:15 to 17:45 is 8 hours 30 minutes, and 2h 45m plus 1h 50m is 4h 35m, not 3.95 hours. This guide covers night shifts, breaks and payroll totals.
Asad · Oct 18, 2026 Read article →A cuboid's volume is length x width x height, its surface is 2 x (lw + lh + wh), and its space diagonal is sqrt(l squared + w squared + h squared): 6 x 4 x 3 gives 72, 108 and about 7.81.
Asad · Oct 18, 2026 Read article →A cylinder's volume is pi x radius squared x height, its total surface is 2 x pi x r x (r + h), and its lateral area is 2 x pi x r x h: radius 5, height 10 gives 785.40, 471.24 and 314.16.
Asad · Oct 18, 2026 Read article →A rectangle's area is length x width, its perimeter is 2 x (length + width), and its diagonal is sqrt(length squared + width squared): 12 x 8 gives 96, 40 and about 14.42. Worked examples and buying mistakes included.
Asad · Oct 18, 2026 Read article →One measurement fixes a whole circle: radius 7 gives diameter 14, circumference 2πr ≈ 43.98 and area πr² ≈ 153.94, while diameter 10 gives radius 5, circumference ≈ 31.42 and area ≈ 78.54. This guide works both anchors and the reverse formulas.
Asad · Oct 17, 2026 Read article →a² + b² = c² finds any third side of a right triangle: legs 3 and 4 give hypotenuse 5, hypotenuse 13 with leg 5 leaves leg 12, and a 30×40 rectangle has diagonal 50. This guide covers both rearrangements, the triples, and screens, ladders and squareness checks.
Asad · Oct 17, 2026 Read article →A triangle’s angles sum to 180°, its perimeter adds the three sides, and its area is ½ × base × height. This guide reads the 3-4-5 triangle completely — area 6, perimeter 12, angles 36.87°, 53.13° and 90° — and works a missing-angle and an equilateral example.
Asad · Oct 17, 2026 Read article →The quadratic formula x = (−b ± √(b²−4ac))/2a solves every quadratic, and the discriminant decides the outcome: positive gives two roots like 3 and 2, zero gives one repeated root, negative gives no real roots. This guide works all three cases in full.
Asad · Oct 17, 2026 Read article →This conversation is closed — thanks for chatting with us.
