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
Master ratios and proportions to compare amounts and solve for unknowns; a ratio compares numbers while a proportion states two ratios are equal.
What Grade Do I Need? Final-Exam & GPA Math
Final-exam and GPA math that shows how to calculate the grade you need to hit a target GPA using a formula that weights your current grades by their value.
Fractions: Adding, Simplifying, and Converting to Decimals & Percents
Step-by-step rules for adding fractions using common denominators and reducing results to simplest form.
How to Calculate Square Footage (Room, Wall & Lot)
How to calculate square footage for rooms, walls, and lots, with adjustments for triangles and multi-sided spaces.
How Many Hours Is My Shift? Hours Between Two Times
Shows how to find hours between two times or a shift length by subtracting start time from end, with practical examples.
Hourly to Salary (and Back): Full Conversion Chart
Hourly-to-salary conversion using the 2,080 working hours per year rule for full-time jobs, showing how to convert hourly wages to annual salary and vice versa.