Is this tool private?

Yes. All processing happens locally in your browser. No data is uploaded.

What extras does this tool have?

Extras: (1) Core function, (2) Batch mode, (3) Copy results, (4) Download, (5) History, (6) CSV export, (7) Custom options, (8) Validation, (9) Warnings, (10) Stats, (11) Multi-format, (12) Configurable, (13) Preview.

Calculators Runs in your browser

Percentage Of Calculator

Calculate X% of Y, what % is X of Y, and % increase/decrease. 100% private. 100% private.

100% Private Works Offline Instant

Core inputs

X (percentage or value)

Y (base value)

X% of Y

10% × 200 = 20

X is what % of Y

(10 ÷ 200) × 100 = 5%

Y + X%

220

200 × (1 + 10%) = 220

Y − X%

180

200 × (1 − 10%) = 180

Original (Y inc. X%)

181.8182

200 ÷ (1 + 10%) = 181.8182 (original before 10% markup)

Y grown by X% × 5

322.102

200 × (1 + 10%)^5 = 322.102

% Change (old → new)

Old value

New value

Percent change

25% increase

((125 − 100) ÷ |100|) × 100 = 25% (increase)

Tip calculator

Bill

Tip %

People

Tip: 18

Total: 118

Per person: 29.5

Discount calculator

Original

Discount %

You save: 50

Final price: 150

Batch percentage

Values (one per line)

PercentageMode

Output

100	10
200	20
500	50

Grade calculator

Score

Max

Grade: B · 85% · GPA 3.0 · Pie angle 306°

100% private — all math runs in your browser.

Calculate X% of Y, what % is X of Y, and % increase/decrease. 100% private. 100% private. Everything runs locally in your browser — your data never leaves your device.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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