How to use it
- Pick the question that matches yours — there are three.
- Type your numbers.
- The answer updates live. No button needed.
~/lokafile / calculators / percentage-calculator
Percentage Calculator
The three percentage questions everyone actually asks — answered live as you type.
What is X%% of Y?
%% of = —
X is what percent of Y?
is = —
Percentage change from X to Y
→ = —
All three update live as you type.
The three forms
Almost every percentage problem is one of three questions: “what is X% of Y” (discounts, tips), “X is what percent of Y” (scores, progress), and “percentage change from X to Y” (prices, growth). This calculator handles all three side by side so you never have to rearrange a formula in your head.
Questions people ask
Is my file uploaded to a server?
No. Every other online converter uploads your file to a server. Lokafile never uploads anything — the work happens in your browser, so your file physically never leaves your device.
Do I need to sign up or pay?
No account, no payment, no watermark, no CAPTCHA before download. Free.
Does it work offline?
Yes — once loaded, you can disconnect and it still works. You can even install Lokafile as an app.
Is there a file size limit?
No artificial cap. The only limit is your device’s memory.
How do I calculate X percent of Y?
Multiply Y by X and divide by 100. 15% of 80 = 80 × 15 ÷ 100 = 12. Or just type it above.
How is percentage change calculated?
(New − Old) ÷ Old × 100. Going from 50 to 65 is a 30% increase.