Calculators · Group 05 of 08
Seven precision instruments for everyday numbers — all running live in the box above. Pick a tool, type your values and watch every result update instantly, right in your tab. Nothing is uploaded, nothing is stored.
Answers the classic question — "what is X% of Y?" — and then keeps going: the result as a ratio, the total when you add the percentage, the difference when you subtract it, and the reverse ratios. One pair of inputs, eight useful numbers.
15% of 200…
30 · 200 + 15% = 230 · 200 − 15% = 170.
Use it for shopping mathtax & tipsexam scoresquick ratios
Measures growth between two values: the absolute change, the percentage increase, the multiplier and a projection of what happens if the same growth repeats. If the second value is actually smaller, it tells you honestly that it's a decrease.
From 80 to 100…
+25% increase · multiplier 1.25× · same growth again → 125.
Use it for salary raisesrevenue growthprice changestraffic & stats
The mirror of the increase tool: how far a value fell, in absolute terms and in percent, plus the recovery figure — the percentage needed to climb back to the original. That last number surprises people: a 20% drop needs a 25% rise to break even.
From 100 down to 80…
−20% decrease · 80% remains · recovery needs +25%.
Use it for discountsweight lossbudget cutserror reduction
A full keypad evaluated by a real expression parser — no eval, no guesswork. Powers, roots, trig and inverse trig, logarithms, π and e, parentheses and postfix percent, in DEG or RAD mode. The result panel also shows x², √x, 1/x, x! and scientific notation of the answer.
sin(30) + √(16) · DEG mode…
4.5 — 0.5 + 4, powers before addition.
Use it for homeworkphysics & engineeringquick triglog scales
Adds, subtracts, multiplies and divides two fractions and always reduces the answer to lowest terms using the greatest common divisor. Improper fractions are also shown as mixed numbers and decimals, so the result reads the way your teacher, your recipe or your code expects it.
1/2 + 1/3…
5/6 ≈ 0.8333 — already in lowest terms.
Use it for school mathrecipes & DIYmeasurementsratio work
Converts between decimal and binary in both directions and fills in the rest of the picture: hexadecimal, octal, bit length, and the value padded to 8 and 16 bits — the exact strings you need for byte-level work.
Decimal 42…
101010₂ · 2A₁₆ · 52₈ · 6 bits → 00101010 padded.
Use it for programmingbitwise logicnetworkingexam problems
Converts between decimal and hexadecimal both ways, with binary and octal alongside. Values up to 0xFFFFFF are also shown as a CSS color code, which makes this tool secretly a color picker for developers who think in numbers.
Decimal 255…
0xFF · 11111111₂ · color #0000FF — pure blue.
Use it for colors & CSSmemory addressesserial protocolsdebugging
Conventions · scientific: ^ before × ÷, functions and parentheses first · % is postfix (50% = 0.5) · trig defaults to DEG · fractions auto-reduced via gcd · binary & hex take non-negative integers up to 2⁵³
This page has no backend and no database. Every number you just watched was computed by JavaScript inside your own browser tab — your expressions and values never traveled a single centimeter of cable. Close the page and they're gone for good.
Standard precedence: functions (sin, cos, √, log…) and parentheses first, then powers (^, right-associative — 2^3^2 is 512), then multiplication and division, then addition and subtraction. The percent sign is postfix: 50% evaluates to 0.5, so 200 + 15% means 200.15; for "200 plus 15 percent of 200" type 200 + 200 × 15%.
The calculator defaults to degrees (DEG), which matches school math and most everyday use. Switch to RAD for calculus and physics — sin(30) is 0.5 in degrees but about −0.988 in radians. Inverse functions (asin, acos, atan) return their answers in the same mode.
Yes. Every fraction result is reduced to lowest terms with the greatest common divisor, and improper fractions are also shown as mixed numbers and decimals. Signs are normalized so the denominator is always positive.
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 numbers are never transmitted, stored or logged — and the scientific parser evaluates expressions locally without ever using eval().