1. Nothing to install
Every calculator runs in the browser — phone, tablet, or laptop. Bookmark the page and it behaves like an app with zero storage cost.
Fraction calculators
Fraction Calculator App
A complete fraction calculator that lives in your browser — free, no download, no account. Add, subtract, convert, and simplify with answers that show the rules they used, so the work can be checked and learned from.
- free, no download
- runs in any browser
- every fraction operation
- step-by-step answers
Visual subtraction tool
See how fraction parts become ready to subtract
Make the parts match, regroup one whole when you need more pieces, then take away the second amount.
Type the full expression
Examples: 3/4 - 1/6, 2 - 3/4, or 2 1/4 - 1 2/3.
Visual explanation
Notice the part sizes
The fractions name different-sized pieces, so they are not ready to subtract yet.
First amount9/4
2 wholes
Amount to take away5/3
1 whole
1/4 part
1/3 part
These pieces are not the same size yet.
The toolbox
One app, a calculator for every job
Mixed Number Calculator
Add and subtract mixed numbers with the regrouping shown bar by bar.
Rational Number Calculator
Convert any rational number between fraction, decimal, and percent forms.
Whole Number Addition Tool
Whole plus fraction, with the visual model making the units clear.
Rational Expressions Calculator
Add algebraic fractions over their least common denominator, step by step.
All Four Operations
Type a full mixed-operation expression; the calculator names each rule it uses.
Subtracting Fractions
The visual subtraction tool with regrouping and common denominators.
Why a web app
Free, installed in one tap, teaching while it computes
2. Add it to your home screen
On a phone, open the browser menu and choose "Add to Home Screen" — LumaMath then opens full-screen like an installed app, still completely free.
3. Answers teach, not just tell
Each tool shows the rules it used — common denominators, regrouping, cancellation — so the work can be checked and learned from, not just copied.
4. Works offline-friendly
Once a page has loaded, the calculators keep working without a connection: all the math happens on your device.
What the step-by-step answers look like
Enter 2 1/4 − 1 2/3 above. The tool matches the fraction parts (quarters and thirds become twelfths), regroups the whole that has to give one up, subtracts, and simplifies — announcing each move in order. The answer 7/12 arrives with its reasoning attached, which is the difference between checking homework and guessing at it.
Every calculator in the toolbox follows the same pattern. The rational number converters name the place value they used; the rational expressions calculator shows the least common denominator and the like-term combination; the operations calculator identifies which rule fired at each step of a mixed expression. Free, in the browser, on whatever device is nearby.
Also typing fractions into a handheld calculator? Read this firstCommon questions
Fraction Calculator App FAQ
Yes — LumaMath’s calculators are a free web app: they run in any browser on phone, tablet, or computer, with nothing to download or install. Add the page to your home screen and it opens full-screen like a native app.