Global Araç
Percentage Calculator
X'in %Y'si nedir?
Sonuç: —
X, Y'nin yüzde kaçıdır?
Sonuç: —%
X'ten Y'ye yüzde değişim
Sonuç: —
A fast percentage calculator that covers the three formulas that actually come up in daily life: “what is X% of Y”, “A is what percent of B”, and “percent change from old to new”. All three are live on the page — fill the one you need. Negative results show red so a price drop or account loss reads at a glance.
For tip and bill-split math specifically, use the Tip Calculator. For a written walkthrough of five common formulas, including markup and reverse percent, see How to calculate percentages.
Nasıl Kullanılır
- Use the first card for “what is X% of Y” — enter two numbers.
- Use the second for “A is what % of B”.
- Use the third for percent change — negative means a drop.
- Numbers update as you type; nothing to submit.
Ne Zaman Kullanılır
- Quick tip math (15% of $48) or tax math (8.5% of $249).
- Checking percent change on a KPI, stock price, or weight — the third card handles before/after.
- Converting a raw score to a percentage grade (42 out of 50 = what %).
- Sanity-checking a discount that advertises an ambiguous save amount.
Ne Zaman Kullanılmaz
- Compounded percent changes over multiple periods — use the compound interest calculator (stacked percents don't add).
- Margin vs markup business math — use the profit margin calculator (they're different base formulas).
Örnek
Card 1: What is 15% of 300? Card 3: From 200 to 260
Card 1 answer: 45 Card 3 answer: +30% change
Negative results are shown in red so a price drop or portfolio loss is visually unmistakable.
Sık Sorulan Sorular
Is a 50% increase followed by a 50% decrease back to the original?
No — this trips up most people. $100 → +50% → $150 → −50% → $75. Percent changes compound multiplicatively (1.5 × 0.5 = 0.75), not additively. Anytime you stack percents, multiply the factors.
How is percent change different from percentage points?
If interest rates move from 4% to 5%, that's a 1-percentage-point rise but a 25% percent change. Journalists and finance pros use 'percentage points' to avoid this ambiguity. The tool reports percent change; translate to points if needed.
Can I reverse a percent discount (find the original price)?
Yes — use the discount calculator's reverse mode. If a sale price is $70 after 30% off, original = $70 ÷ 0.7 = $100. The math is one divided by the retained fraction, not plus 30%.
Why do my tip + tax results differ between apps?
Order of operations. Tax on the pre-tip subtotal, then tip on pre-tax or post-tax subtotal — all three are valid and all three produce different totals. US convention is tip on pre-tax.