Weighted GPA: credits count, not courses
A weighted GPA multiplies grade×credits, adds up and divides by total credits: an A (4.0) in a 12-credit course weighs four times more than a C (2.0) in a 3-credit one. US grades run 0 to 4.0, and for exchange or Italian applications the calculator also shows the 30 scale. Weighting stops a small elective from skewing the average. This calculator is built for fast, private, offline use in your browser. Every formula runs locally and is verified against official sources. You enter the key numbers, see the result instantly and check the steps.
TL;DR
- Total points / total credits gives the GPA.
- Formulas: GPA = Σ(grade×credits)/Σcredits | 30L=31
- Example 1: 3.7 (3 cr), 4.0 (4 cr) — Points: 3.7×3 + 4.0×4 = 11.1 + 16.0 = 27.1
How it works
Points = grade×credits per course. Total points / total credits gives the GPA. The calculator detects the scale from the size of the grade: above 4.0 it is the Italian 30 scale (30L counts as 31), below it the 4.0 scale, and it shows both. Start with clean data, keep the same units and follow the order in the formula. The tool does the arithmetic, you choose rate, period or factor. A second example with different numbers shows how the result scales.
The math
3.7×3+4.0×4=11.1+16.0=27.1 points÷7 credits=3.87. With uneven credits the simple mean lies: 4.0(12cr)+2.0(3cr)=48+6=54÷15=3.6 instead of an even 3.0. Credits in the denominator do justice to the big courses.
6 credits weigh twice as much as 3. Italian 30L counts as 31 points.
Examples
Example 1: 3.7 (3 cr), 4.0 (4 cr)
- Points: 3.7×3 + 4.0×4 = 11.1 + 16.0 = 27.1
- Credits: 3 + 4 = 7
- GPA: 27.1 ÷ 7 = 3.87
- Major and minor courses fairly weighted
Example 2: 4.0 (12 cr) and 2.0 (3 cr)
- Points: 4.0×12 + 2.0×3 = 48 + 6 = 54
- Credits: 12 + 3 = 15
- Weighted: 54 ÷ 15 = 3.6
- Simple would be (4.0 + 2.0) ÷ 2 = 3.0, more than half a point lower
When to use it
✦ Scholarships and Dean's List
Before finals, check whether the GPA cutoff is still in reach and what grade each exam needs.
✦ Transfer and grad school
Place a 4.0 GPA next to 30-scale or percent grades for an application, with the registrar validating the conversion.
⚠ Common mistakes
- Simple mean without credits: a 4.0 in 3 credits then counts as much as a 2.0 in 12.
- Mixing scales: US 4.0, Italian 30 and percent grades in one calculation. The calculator keeps them apart, you pick one.
- Counting 30L as 30: with honors it is 31 and pulls the average up.
FAQ (7)
Weighted or simple?
Weighted divides points by credits. Simple divides by course count and favors small electives.
What GPA do scholarships need?
It depends on the program rules; the official rules always win.
How much is 30L worth?
31 points in the Italian system: it enters the weighting raised.
Do you save the numbers I type for area, volume or conversions?
Not at all. Every conversion — kg to lbs, area, fraction math — runs locally. No form data is posted anywhere. You can convert 1,500 kg to lbs on a shared computer and walk away knowing nothing was logged.
Will it work without internet in class?
Yes — that's why students like it. Load once on Wi-Fi, then fraction, base-converter or standard deviation work offline in class or in an exam hall without signal. It's just math in JavaScript, no server round-trip.
How accurate are the math results?
We use standard definitions (e.g. 1 kg = 2.20462 lbs, BIPM SI) and double-check edge cases via automated tests. For homework or site measurements it's more than enough, but for certified engineering or lab work, cross-check with the primary standard.
Can I share a calculation with a classmate?
Tap 'Share Link' — it puts the inputs in the URL. Your classmate opens it and sees the same 3/4 → 0.75 → 75% breakdown instantly, without retyping.
Sources & References
How this calculator is maintained
This calculator is written and maintained by Davide Coronese, independent developer and founder of CalcTracker.
Methodology: every formula is checked against official publications and validated by an automated test suite before release. Health, tax and finance pages cite the exact sources they rely on.
Found an error? Contact us — verified corrections ship within 24 hours.