Compute simple probability as favorable outcomes divided by total outcomes — coin flips, dice rolls, card draws. See 3 in 10 read as 30.0% instantly — free, local, no signup.
Content reviewed October 2026 · About Toolzum
Compute test percentages and grades from correct/total with curve options. Turn 42/50 into 84% (B) instantly — free, local, no signup.
Compute semester GPA from course grades and credit hours with credit-weighted math on the standard 4.0 scale — quick academic snapshot. See what straight B's earn — free, local, no signup.
Convert a single course percentage into its letter grade on the built-in plus/minus scale — see that an 85 earns a B instantly. Free, local, no signup.
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes from text or file input using CryptoJS. Paste text or drop files; digests compute instantly for checksums and lookups — free, local, no signup.
Convert numbers between binary, octal, decimal, and hex with bitwise views. Read 0xFF as 255 instantly — local math, free, no signup.
Not directly — this tool divides two counts you supply, so 6 and 49 reads 12.2%, which is not the lottery odds (real 6/49 combinatorics give about 1 in 14 million). Enter precomputed counts only; it never computes combinations.
Neither — the tool computes one simple ratio (favorable ÷ total). Multi-event, with-replacement, and conditional setups must be reduced to two counts by hand first.
Results show as a percentage with one decimal plus a bar (3 in 10 reads 30.0%). No fraction or odds-ratio display — convert those by hand.
No — math runs locally in your browser. Numbers never leave your device.
Combination Calculator
Compute nCr combinations and nPr permutations with factorial steps shown. Count 5-card poker hands (2,598,960) correctly — free, local, no signup.
Permutation Calculator
Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Numbers never leave your device — every calculation runs locally in your browser.