Math & Education

Whether it’s “what’s 23% of 4,500?” or “how many square feet is 40 square metres?”, you shouldn’t have to dig out a formula or open a spreadsheet. The calculators in this section cover the stuff that comes up all the time: percentages (including increases and decreases), exact age in years and months, GPA from your grades, and every unit conversion most people need—length, weight, temperature, area, volume, and time. Students use them for homework; everyone else uses them for recipes, travel, DIY, or that random “wait, how old am I in days?” moment.

All the maths uses standard, well-known formulas. You enter your values, pick the units you want, and get an answer. The scientific calculator is there when you need powers, roots, logarithms, or trig. Everything is computed locally—your inputs stay on your machine and we don’t have access to them.

We added this category because “quick math” and “unit conversion” were two of the most common requests. If you’re comparing metres and feet for a room, Celsius and Fahrenheit for the oven, or kg and pounds for luggage, you’ll find the right tool below. Bookmark the ones you use often; they’re free and they’ll stay that way.