Guides
Guides — guides, articles and tools from CalcaTools covering every topic in this category. Free, fast, browser-based explainers with no sign-up.
Ratios & Proportions: How to Solve Them
Have you ever needed to compare amounts or figure out how much of something you need? That’s where ratios and proportions come in handy! They help us understand how different…
What Grade Do I Need? Final-Exam & GPA Math
Have you ever wondered what grade you need on that big final exam? Or maybe you want to know what it takes to hit a certain GPA? I’ve been there!…
Percentage Difference vs Change: Formulas & Examples
Have you ever needed to compare two numbers? Maybe you wanted to see how much one price differs from another. Or perhaps you tracked how much something grew or shrank…
Days From Now & Days Ago: Counting Between Dates
Figuring out how many days have passed or how many are left until a certain date can seem tricky. Maybe you need to know the time until a specific event,…
What Time Will It Be in X Hours? Time-From-Now Guide
Ever wondered what time it will be in a few hours or minutes? It’s a common question, whether you’re planning something, scheduling tasks, or just curious. Figuring out a future…
Fraction to Percent: How to Convert (with Chart)
Do you need to turn a fraction into a percentage? It’s easier than you might think! First, you divide the top number (numerator) by the bottom number (denominator). This gives…
Adding & Simplifying Fractions: Step-by-Step
Adding & Simplifying Fractions: Step-by-Step Working with fractions means you need to know a few basic rules. This is especially true when you add them or make them simpler. For…
How to Calculate Square Footage (Room, Wall & Lot)
To calculate square footage, you multiply the length of an area by its width. This fundamental principle applies whether you’re measuring a rectangular room, a wall, or a land lot,…
How Many Hours Is My Shift? Hours Between Two Times
Want to figure out how long your shift is? Or just how many hours are between two times? It’s pretty simple: you just subtract the start time from the end…
Hourly to Salary (and Back): Full Conversion Chart
It’s really helpful to know how to switch between an hourly wage and a yearly salary. Most full-time jobs in the U.S. use a simple rule: 2,080 working hours in…