Free online calculators for percentages, home projects, business costs, food and more. Accurate answers in seconds, with clear formulas and worked examples.https://opalcalculator.com/https://opalcalculator.com/blog/how-to-calculate-cubic-yards/https://opalcalculator.com/blog/how-to-calculate-cubic-yards/A simple method for working out cubic yards of soil, mulch, gravel or concrete, with a worked example and tips to avoid ordering too little.Thu, 08 Oct 2026 00:00:00 GMThttps://opalcalculator.com/blog/llc-vs-s-corp/https://opalcalculator.com/blog/llc-vs-s-corp/An S corp is a tax election, not a business structure. Learn how an LLC and an S corp differ, when the election may help and what to ask your accountant.Wed, 07 Oct 2026 00:00:00 GMThttps://opalcalculator.com/blog/percentage-increase-vs-decrease/https://opalcalculator.com/blog/percentage-increase-vs-decrease/Why a 20% drop and a 20% rise do not cancel out, how to calculate each change and how to reverse a percentage with simple examples.Tue, 06 Oct 2026 00:00:00 GMT