Calculators · Group 04 of 08
Eight precision instruments for grades and data — all running live in the box above. Pick a tool, type your grades or numbers and watch every metric update instantly, right in your tab. Nothing is uploaded, nothing is stored.
Computes a credit-weighted GPA on the standard 4.0 scale. Enter your grades as letters (A, B+, C−…) or as point values, list the matching credit hours, and it returns the weighted average plus quality points, letter equivalent and honors standing.
Grades A, A−, B+, B, A · credits 3, 4, 3, 2, 3…
GPA 3.65 over 15 credits — cum laude territory.
Use it for semester GPAcumulative GPAhonor roll checksapplication forms
Converts in both directions at once: a 4.0-scale GPA becomes a linear percentage (GPA ÷ 4 × 100), and a percentage becomes a GPA (÷ 25). Each direction also shows the matching letter grade, which is what most transcripts and applications actually ask for.
GPA 3.6 · and separately · 85%…
3.6 → 90% (A) · 85% → GPA 3.40 (B+).
Use it for transcript conversioninternational applicationsscholarship formsCV summaries
Moves a cumulative grade point between the three scales that appear most often on documents: 10-point CGPA, 4-point GPA and percentage. The percentage uses the widely cited ×9.5 CBSE convention for 10-point CGPAs, plus a plain linear conversion for comparison.
CGPA 8.2 out of 10…
77.9% (×9.5) · 3.28 / 4 · grade band B+.
Use it for university applicationsvisa & job documentsgrade verificationreport cards
The everyday summary of any list of numbers: paste values separated by commas, spaces or new lines and get the average, sum, count, min, max and range — plus a trimmed average that drops the single highest and lowest values before dividing, which softens the effect of outliers.
12, 15, 18, 21, 24…
Average 18 · sum 90 · range 12.
Use it for test scoresprices & quotesratingsdaily measurements
Where the average tool gives you one number, this one compares the four classical means side by side: arithmetic (sum ÷ n), geometric (the product's nth root — right for growth rates), harmonic (right for rates and ratios) and RMS. It adds a 10% trimmed mean and the midrange for context.
2, 4, 8…
AM 4.67 · GM 4.00 · HM 3.43 · RMS 5.29 — ordered exactly as theory predicts.
Use it for growth ratesspeeds & ratessignal magnitudesstatistics homework
Finds the middle of a data set — the value with half the data below it and half above — and builds the five-number summary around it: median, Q1, Q3, min and max, with the interquartile range that measures the spread of the central 50% without being dragged by extremes.
7, 3, 9, 1, 5 → sorted 1, 3, 5, 7, 9…
Median 5 · Q1 3 · Q3 7 · IQR 4.
Use it for salaries & incomehouse pricesoutlier-proof statsbox plots
Finds the value — or values — that appear most often. It reports every mode when a set is bimodal or multimodal, how many times each occurs, what share of the data it covers, and how many distinct values exist in total.
4, 7, 2, 7, 9, 7, 2…
Mode 7 — appears 3× · 42.9% of the set · 4 unique values.
Use it for survey answersmost common valuecategorical dataquality checks
Measures how spread out a data set is around its mean. It computes both the sample standard deviation (n − 1) — the one you want for samples — and the population version (n), together with both variances, the standard error of the mean and the coefficient of variation.
10, 12, 14, 16, 18…
s = 3.16 (sample) · σ = 2.83 (population) · mean 14 · SE 1.41.
Use it for lab reportstest score spreadquality controlresearch data
Conventions · GPA on the 0–4 U.S. scale (A = 4 … F = 0) · average = sum ÷ count · sample SD divides by n−1 · population SD by n · lists accept commas, spaces and new lines · CGPA percentage uses ×9.5 for 10-point scales
This page has no backend and no database. Every grade and every number you just typed was processed by JavaScript inside your own browser tab — nothing traveled a single centimeter of cable. Close the page and it's gone for good.
The arithmetic average and the arithmetic mean are the same number — sum divided by count. The Average Calculator focuses on the everyday summary (sum, min, max, range, trimmed average), while the Mean Calculator compares the arithmetic mean with the geometric, harmonic and RMS means, and adds a trimmed mean and the midrange.
Use the sample standard deviation (dividing by n − 1, Bessel's correction) when your data is a sample drawn from a larger population — the common case in surveys, experiments and homework. Use the population standard deviation (dividing by n) only when your data set is the entire population you care about.
The standard U.S. 4.0 scale: A+/A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, B− = 2.7, C+ = 2.3, C = 2.0, C− = 1.7, D+ = 1.3, D = 1.0, D− = 0.7, F = 0. You can also type numeric point values directly if your school prints them on the transcript.
No. IrisTool has no backend and no database. All calculations run inside your browser tab and disappear the moment you close or refresh the page. Your grades and numbers are never transmitted, stored or logged.
Yes. Once the page has loaded, every calculator keeps working offline, because all the math runs locally in your browser — there is no server round-trip to fail.