Math & Numbers Calculators
Solve percentages, fractions, roots, and sequences.
163 free calculators
The Calculators Behind Every Other Calculator
Percentages, ratios, rounding, and unit conversions are the building blocks that every other category depends on. These tools handle the pure math — no domain knowledge required, just numbers in and answers out.
Everyday Math Made Instant
The rounding calculator and round to the nearest tenth calculator are the kind of tools you don't think you need until you're staring at a spreadsheet full of decimals. The aspect ratio calculator solves a problem that comes up constantly in design, photography, and video — scaling dimensions while keeping proportions intact. And the absolute value calculator handles the one operation that trips people up more than it should.
Going Deeper
Beyond the basics, you'll find tools for arc length, number sequences, and mathematical operations that show up in engineering, physics, and finance formulas. Many of the calculators in our physics and chemistry sections rely on the same underlying math covered here. If you're working through a textbook or course, these tools let you check your work step by step rather than just giving you a final answer.
Related Sections
For applied math in a specific field, try statistics (probability, confidence intervals, hypothesis testing) or business finance (margins, ratios, break-even analysis).