Round results to correct significant figures with rule explanations — 0.00450 has 3. Stop overstating lab precision — free, local, no signup.
Compute test percentages and grades from correct/total with curve options. Turn 42/50 into 84% (B) instantly — free, local, no signup.
Raise any base to any power — squares, cubes, negative and fractional exponents with full precision. Students check 2^10 = 1024 homework in seconds — free, no signup, runs locally.
Compute semester GPA from course grades and credit hours with weighted math. Students check what an A in a 4-credit lab does before finals — free, no signup, runs locally.
Preview your text in 6 Google fonts — Inter, Playfair Display, Fira Code, Pacifico, Outfit, and Montserrat — and copy the ready-to-use CSS import plus font-family rule. Free, local, no signup.
Diff two PDFs side by side — spot changed clauses, figures, and pages before signing. Review a 20-page contract revision in minutes — local PDF.js comparison, free, no signup.
Three (4, 5, 0) — leading zeros never count, trailing zeros after decimal always do. The tool annotates each digit's status.
Multiply/divide: fewest sig figs wins. Add/subtract: fewest decimal places wins. Different rules per operation — the classic exam trap.
Counts and definitions (12 inches/foot) carry infinite precision — they never limit results. Measured values alone constrain.
No — math runs locally in your browser. Numbers never leave your device.
Rounding Calculator
Round numbers using 5 modes: round half up, banker's rounding, floor, ceil, and truncate. Shows step-by-step explanation with the digit being rounded. Numbers never leave your device — every calculation runs locally in your browser.
Scientific Notation Converter
Convert between standard and scientific notation — 6,020,000,000 ↔ 6.02×10⁹. Handle Avogadro-scale numbers cleanly — free, local, no signup.
Last updated October 2026