Calculators — Guides & Articles
How to Calculate Developer Fee: Rates and Hours
Published 2026-09-10
Calculate developer fee for software work: hourly, fixed-price, retainer, and percentage models, with a precise 32-bit integer walkthrough.
How to Find Prime Numbers Between 100 and 200
Published 2026-09-09
There are exactly 21 primes between 100 and 200. Get the full list with the free Prime Number Generator — Sieve of Eratosthenes in your browser.
How to Calculate Percentage of a Number (With Examples)
Published 2026-09-09
Find X% of any number using (X ÷ 100) × Y. See real examples for discounts, tips, and tax, and use the free Percentage Calculator to check your work.
How to Find Prime Factorization by Division Method
Published 2026-09-09
The division method breaks any whole number into prime factors. Divide by 2, 3, 5 until the quotient reaches 1, with a worked example and a free instant tool.
Maximum Allowable Pressure vs Design Pressure
Published 2026-09-09
Maximum allowable pressure vs design pressure: how MAWP differs from design pressure and how to convert pressure units between psi, bar and MPa.
Pregnancy Due Date After Embryo Transfer: How to Calculate
Published 2026-09-09
Calculate your pregnancy due date after embryo transfer by converting the transfer day to an equivalent last menstrual period, then using the Pregnancy Due…
How to Convert PowerPoint to Canva: Import + Power Math
Published 2026-09-09
Step-by-step method to import a PowerPoint file into Canva using a desktop browser, plus convert watts, kW, hp, BTU/h and more for technical slides.
Digits of Pi Example: 10 to 10,000 Decimal Places
Published 2026-09-09
Looking for a digits of pi example? See pi to 10, 50, 100, 1,000, or 10,000 decimal places, with the Feynman point at position 762 explained.
Interactive Periodic Table Alternative: All 118 Elements
Published 2026-09-08
Looking for an interactive periodic table alternative? Browse all 118 elements with IUPAC weights, instant search, and category filters — no sign-in.
How to Find Parallelogram Area With Diagonals
Published 2026-09-08
Find the area of a parallelogram from its diagonals using A = ½ · d₁ · d₂ · sin(θ). Step-by-step formula, worked example, plus a free area tool.