Best Percenatge Calculator on the Internet.
Percentage Calculator
Calculate percentages, discounts, tips, reverse VAT & more — fast and free
Basic Percentage Calculator
Find any part of a percentage equation
Percentage Change Calculator
Calculate increase or decrease between two values
Reverse Percentage Calculator
Find the original value before a % was applied
Discount Calculator
Find sale price, savings & effective discount
Tip Calculator
Calculate tips & split bills — perfect for UK restaurants
Bulk Percentage Calculator
Calculate multiple percentages at once
| # | Percentage (%) | Number | Result |
|---|
Right, be honest — when was the last time you worked out a percentage in your head and actually trusted the answer? Most of us either reach for a phone calculator or just guess and hope for the best. That's exactly why we built the tool above: one single percentage calculator UK shoppers, students and small business owners can rely on, covering the six situations people actually run into day to day — a plain percentage of a number, a percentage change between two figures, a reverse percentage calculator for stripping VAT off a price, a discount calculator, a tip calculator UK users can split a bill with, and even bulk calculations if you've got a whole list of numbers to get through. No more switching between five different calculator apps.
In this guide we'll walk through exactly how this percentage change calculator and its five sister tools work, what each of the six tabs does, and — more importantly — how the actual maths behind each one works, so you're not just getting a number, you understand where it came from. Think of it as a percentage calculator with steps built in, rather than a black box that spits out an answer you have to trust blindly.
What This Percentage Calculator Actually Does
Rather than build six separate calculators (and make you hunt for the right one every time), we put everything into one tabbed tool. Here's a quick breakdown of what lives under each tab:
| Tab | What it's for | Typical use case |
|---|---|---|
| Basic % | Works out a percentage of a number, what % one number is of another, or the total when you know the percentage | "What's 15% of £240?" |
| % Change | Finds the percentage increase or decrease between two values | Comparing this month's electricity bill to last month's |
| Reverse % | Works backwards from a final value to find the original amount before a % was applied | Removing 20% VAT from a receipt total |
| Discount | Calculates the sale price, how much you save, and the price with VAT added back on | Working out a 30% off sale price before you buy |
| Tip Calc | Splits a restaurant bill and works out the tip, per-person cost included | Splitting a dinner bill between four people |
| Bulk | Runs several percentage calculations at once in a table | Checking margins on a dozen products in one go |
How to Use This Calculator (Step by Step)
The calculator's designed to be self-explanatory, but here's the quick version so you're up and running in a few seconds:
- Pick the right tab at the top — Basic %, % Change, Reverse %, Discount, Tip Calc or Bulk — depending on what you're trying to work out.
- Type your numbers into the input boxes. Each field is labelled clearly, so you'll always know whether it wants an original value, a new value, or a percentage.
- Press "Calculate Result". The answer appears straight away, along with the exact formula used, so you can double-check the working yourself.
- Check the extra figures underneath. Most tabs give you more than just the headline number — for example, the Discount tab also shows you the price with VAT added back on, and the Tip tab shows the cost per person.
- Hit "Reset" whenever you want to start fresh. It clears everything and takes you straight back to the top of the calculator.
Every calculation you run also gets logged in the Calculation History section further down, so if you're comparing a few different numbers (say, three different discount percentages on the same item), you can scroll back and see them all side by side instead of re-typing everything.
The Basic % Tab: Percentages, Explained Properly
This is the one most people land on first, and it actually covers three different questions people mean when they say "work out the percentage of a number" or ask "what percentage is x of y":
| Question | Formula | Worked example |
|---|---|---|
| What is X% of Y? | (X ÷ 100) × Y | 20% of 150 = 30 |
| X is what % of Y? | (X ÷ Y) × 100 | 30 is 20% of 150 |
| X is Y% of what? | Y ÷ (X% ÷ 100) | 30 is 20% of 150 |
These three questions are really the same relationship viewed from three different angles, which is exactly why we grouped them under one tab instead of scattering them across the site. It's what makes this a genuine percentage calculator with steps — you can see exactly which formula produced your answer, not just the final figure.
% Change: The One People Get Wrong Most Often
If you've been searching for how to calculate percentage increase or how to calculate percentage decrease, this is the tab you want. Here's a mistake worth flagging, because it trips up a lot of people: when you're working out a percentage change, you always divide by the original value, not the new one. Go from 40 to 68 and you get a 70% increase. But go back from 68 to 40 and it's only a 41.2% decrease — not 70%, because the "original" number is different each time.
The formula the calculator uses is:
% Change = ((New Value − Original Value) ÷ Original Value) × 100
This is the tab you want for tracking things like a pay rise, comparing energy bills month to month, or seeing how much your grocery shop has crept up over the year.
Reverse % and VAT: Working Backwards
This tab is essentially a reverse percentage calculator, and it answers a question that catches people out constantly: "I know the final price — what was it before the percentage was added?" It's the one to use if a receipt only shows the VAT-inclusive total and you need the net figure for expenses or bookkeeping, or if you simply want to know how to remove VAT from a price without doing the division by hand.
There are three modes built into this tab:
- After % increase — you have the final value after something went up by a percentage, and you want the starting figure.
- After % decrease — same idea, but for something that's gone down.
- Remove VAT (20%) — a shortcut specifically for UK VAT, since the standard rate has sat at 20% since January 2011.
The maths behind removing VAT: divide the VAT-inclusive (gross) price by 1.20. So £120 including VAT becomes £100 net, with £20 being the VAT element. A common error is to just take 20% off the gross figure instead — that actually overstates the VAT, because the 20% was calculated on the net price, not the gross one.
Discount Tab: Sales, Savings and Sale Price
Every high street sale sign says "up to 50% off", but very few of them tell you the actual number you'll pay. This is where our discount calculator earns its keep — punch the original price and the discount percentage into this tab and you'll instantly see the sale price, how much you've saved in cash terms, and — as a bonus — what the price would be if VAT were added back on top. If you've ever wondered how to calculate discount percentage by hand, the working is shown right underneath the result.
Sale Price = Original Price × (1 − Discount%)
Worth remembering: if you're stacking two discounts (say a 20% sale price, then an extra 10% off at the till), the second discount applies to the already-reduced price, not the original one — so two discounts never simply add together.
Tip Calculator: Splitting the Bill Without the Awkward Maths at the Table
Tipping culture in the UK isn't as fixed as in the US, but 10% is generally seen as the standard for decent service in a restaurant, with 12.5% sometimes already added automatically as a discretionary service charge (worth checking your bill before tipping again on top). As a tip calculator UK diners can actually use at the table, this tab lets you enter the bill total, pick a tip percentage, and split the total between however many people were there — so if you've ever needed to calculate tip and split bill UK style between mates after a group dinner, or you're simply trying to work out how to split a restaurant bill fairly, this tab does it in seconds instead of everyone doing long division after a few drinks.
Bulk Tab: When One Calculation Isn't Enough
If you're checking percentages across a list — margins on several products, discounts across a basket of items, or grades across a set of test scores — this bulk percentage calculator tab lets you add as many rows as you need and get every result (plus a running total) in one screen, rather than resetting a calculator over and over for every single number.
Real-Life Examples You'll Actually Use
| Situation | Which tab to use | Example |
|---|---|---|
| Sale on a £80 jacket, 25% off | Discount | You pay £60, saving £20 |
| Rent went from £900 to £975 | % Change | That's an 8.3% increase |
| Receipt shows £48 including VAT | Reverse % | Net price is £40, VAT is £8 |
| £64 restaurant bill, 12.5% service, split 4 ways | Tip Calc | £18 each |
| Exam score of 78 out of 90 | Basic % | That's 86.7% |
Common Percentage Mistakes Worth Avoiding
- Dividing by the wrong number. Percentage change always uses the original value as the base — swap it and your answer will be wrong.
- Subtracting a percentage instead of dividing to reverse it. To remove 20% VAT, divide by 1.20 — don't just take 20% off the total.
- Assuming two discounts add up. 20% off, then 10% off, is not 30% off overall — it's roughly 28%, because the second discount is applied to a smaller number.
- Forgetting to multiply the decimal by 100. 45 ÷ 60 gives you 0.75 — that's a decimal, not a percentage, until you multiply it by 100.
Frequently Asked Questions
How do you work out a percentage of a number?
Divide the percentage by 100, then multiply by the number. So 15% of 240 is (15 ÷ 100) × 240 = 36. The Basic % tab does this instantly and shows the working alongside the answer.
What percentage is X of Y?
Divide X by Y, then multiply by 100. For example, 30 is what percent of 150? 30 ÷ 150 × 100 = 20%. You'll find this exact mode under the Basic % tab.
How do I calculate percentage increase or decrease between two numbers?
Subtract the original value from the new value, divide the result by the original value, then multiply by 100. A positive answer means an increase, a negative one means a decrease. The % Change tab handles all of this for you and labels the result as either an increase or a decrease automatically.
How do I remove VAT from a price?
Divide the VAT-inclusive (gross) price by 1.20 for the standard 20% UK rate — never just subtract 20%, as that overstates the VAT. Head to the Reverse % tab, choose "Remove VAT (20%)", and enter the gross price to get the net amount and the VAT element broken out separately.
How do you work out a discount percentage?
Multiply the original price by (1 − discount as a decimal). A £50 item at 30% off is £50 × 0.70 = £35. The Discount tab also shows you the amount saved and the price with VAT added back on, so you're not left doing extra sums.
How much should I tip in the UK, and how do I split the bill fairly?
Around 10% is standard for good service in a UK restaurant, though some venues already add a 12.5% discretionary service charge to the bill — worth checking before you tip again on top. To calculate tip and split bill UK style between a group, use the Tip Calc tab: enter the bill total, choose your tip percentage, and set the number of people to see exactly what everyone owes.
Can I calculate several percentages at once instead of one at a time?
Yes — the Bulk tab is built exactly for this. Add as many rows as you need, enter a percentage and number (or two numbers to find a percentage) in each row, and every result is calculated together with a running total, so you don't have to reset the calculator between each figure.
Is this percentage calculator free to use?
Yes, every tab on this calculator is completely free, works directly in your browser, and doesn't need an account or sign-up.
Does the calculator save my calculations?
Yes — every calculation you run appears in the Calculation History section beneath the results, so you can refer back to previous numbers without re-entering them. Clearing your browser tab will reset the history.
Can I use this on my phone?
Yes, the calculator is fully mobile-friendly and works the same way on a phone, tablet, or desktop browser.
Other UK Calculators You Might Find Useful
- UK VAT Calculator — add or remove VAT on any amount
- Take Home Salary Calculator — see your pay after tax and National Insurance
- Stamp Duty Calculator — work out property tax before you buy
- Fuel Cost Calculator — estimate the cost of a journey based on your car's MPG
Bookmark this page — between the six tabs above, it should cover almost every percentage question that comes up day to day, from a quick shop discount to sorting out VAT on a business invoice.
No comments:
Don't add any Spam link in comment box.