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- Health
How to Calculate Mean Arterial Pressure (MAP), With a Worked Example
Learn the MAP formula, why diastolic counts double, and why the 65 mmHg perfusion target is easy to miscalculate with a naive average. Free calculator.
July 11, 2026 - Health
How to Calculate the Anion Gap (With Albumin Correction)
Learn to calculate the anion gap from sodium, chloride and bicarbonate, correct it for low albumin, and read the result with a free anion gap calculator.
July 11, 2026 - Productivity
How to Calculate Time Duration Between Two Times (Even Overnight)
Learn how to find the hours and minutes between two clock times, including overnight spans that cross midnight. Free duration calculator included.
July 11, 2026 - Health
How to Calculate the HEART Score for Chest Pain (With a Worked Example)
Learn how the HEART score stratifies chest pain risk in the ED: the 5 criteria, a worked example crossing risk tiers, and a free calculator.
July 11, 2026 - Developers
How to Check Text Similarity Between Two Pieces of Text (Cosine Similarity Explained)
Learn how cosine similarity scores text overlap, with two worked examples (74% and 6%) showing what the score can and can't tell you.
July 11, 2026 - Utilities
How to Convert Cm to Inches (Why the TV Size Isn't the Width)
1 cm = 0.393701 inches. See the exact factor, worked examples for height, TV screens and paper sizes, and the rounding mistakes that cost money at scale.
July 11, 2026 - Utilities
How to Convert Km to Miles (Exact Factor, Not the Rounded 0.62)
1 km = 0.621371 miles. See the exact factor, race-distance examples (5K to marathon), and the nautical mile and Scandinavian mil traps.
July 11, 2026 - Developers
How to Convert Number Bases: Binary, Octal, Decimal, and Hex
Learn how to convert numbers between binary, octal, decimal, and hex by hand, with a full worked example (202) and a real chmod 755 case.
July 11, 2026