# Percentage Calculator

> UK-applied percentage calculators for tax, salary, savings, mortgages and more — figures sourced from HMRC, ONS and Land Registry with retrieval dates.

## Calculators

- [What is X% of Y?](https://www.percentagecalculator.co.uk/percent-of/x-of-y/) — Calculate what X% of any number is. Worked UK examples: 20% of £150 = £30; 5% of £35,000 = £1,750. Includes the formula, step-by-step working, and FAQs.
- [X is what percent of Y?](https://www.percentagecalculator.co.uk/percent-of/x-is-what-percent/) — Work out what percentage one number is of another. UK examples, the formula shown, and step-by-step working.
- [Reverse percentage: X is P% of what?](https://www.percentagecalculator.co.uk/percent-of/reverse/) — If £30 is 20%, what's the original? Reverse percentage calculator with worked UK examples including how to deduce a price before VAT.
- [Percentage Increase Calculator](https://www.percentagecalculator.co.uk/percent-change/increase/) — How to calculate percentage increase between two values, with the formula, step-by-step working, and worked UK examples in pounds. Free.
- [Percentage Decrease Calculator](https://www.percentagecalculator.co.uk/percent-change/decrease/) — How to calculate percentage decrease between two values, with the formula, step-by-step working, and worked UK examples in pounds. Free.
- [Percentage Difference Calculator](https://www.percentagecalculator.co.uk/percent-change/difference/) — How to calculate the percentage difference between two numbers — formula, step-by-step working, and worked examples (e.g. 180 vs 65 = 92.4%).
- [Percentage Points Calculator](https://www.percentagecalculator.co.uk/percent-change/points/) — When the Bank of England raises base rate from 5% to 5.25%, that's 0.25 percentage points — but a 5% relative rise. Calculator + UK examples.
- [Percentage of a Percentage](https://www.percentagecalculator.co.uk/percent-change/percent-of-percent/) — Compound percentages: what is 30% of 20%? Useful for nested rates, commission stacks, and the 60% effective tax trap.
- [Average and Weighted Percentage](https://www.percentagecalculator.co.uk/percent-change/average-weighted/) — Calculate UK weighted average %: 50% on a 90-mark exam plus 100% on a 10-mark quiz = 55% weighted, not 75%. Plus portfolio returns.
- [Fraction to Percentage](https://www.percentagecalculator.co.uk/conversions/fraction-to-percent/) — Convert any fraction to a percentage. With worked examples for halves, thirds, quarters, fifths and sixths.
- [Halves converted to percentages](https://www.percentagecalculator.co.uk/conversions/fraction-to-percent/halves/) — 1/2 = 50%, 2/2 = 100%. Worked examples and the formula.
- [Thirds converted to percentages](https://www.percentagecalculator.co.uk/conversions/fraction-to-percent/thirds/) — 1/3 = 33.33% (recurring), 2/3 = 66.67%, 3/3 = 100%. Worked examples and the formula.
- [Quarters converted to percentages](https://www.percentagecalculator.co.uk/conversions/fraction-to-percent/quarters/) — 1/4 = 25%, 2/4 = 50%, 3/4 = 75%, 4/4 = 100%. Worked examples and the formula.
- [Fifths converted to percentages](https://www.percentagecalculator.co.uk/conversions/fraction-to-percent/fifths/) — 1/5 = 20%, 2/5 = 40%, 3/5 = 60%, 4/5 = 80%, 5/5 = 100%. Worked examples and the formula.
- [Sixths converted to percentages](https://www.percentagecalculator.co.uk/conversions/fraction-to-percent/sixths/) — 1/6 = 16.67%, 2/6 = 33.33%, 3/6 = 50%, 4/6 = 66.67%, 5/6 = 83.33%, 6/6 = 100%. Worked examples and the formula.
- [Decimal to Percentage](https://www.percentagecalculator.co.uk/conversions/decimal-to-percent/) — Convert any decimal to a percentage. 0.75 = 75%. With worked examples and the formula.
- [Percentage to Decimal](https://www.percentagecalculator.co.uk/conversions/percent-to-decimal/) — Convert a percentage to a decimal. 75% = 0.75. With examples and the formula.
- [Percentage to Fraction](https://www.percentagecalculator.co.uk/conversions/percent-to-fraction/) — Convert a percentage to a simplified fraction. 75% = 3/4.
- [Ratio to Percentage](https://www.percentagecalculator.co.uk/conversions/ratio-to-percent/) — Convert a ratio (e.g. 3:1) to percentage shares. Includes betting-odds and survey-share examples.
- [UK Income Tax Calculator (2026/27)](https://www.percentagecalculator.co.uk/tax/income-tax-calculator/) — Free UK income tax calculator using HMRC 2026/27 bands. Personal allowance, basic, higher and additional rate, plus the £100k allowance taper.
- [UK National Insurance Calculator](https://www.percentagecalculator.co.uk/tax/national-insurance/) — Class 1 employee National Insurance calculator using HMRC 2026/27 thresholds. 8% on earnings above £12,570 to £50,270, then 2%.
- [UK Take-Home Pay Calculator (2026/27)](https://www.percentagecalculator.co.uk/tax/take-home-pay/) — Combined PAYE income tax + Class 1 NI calculator. Shows net annual and monthly take-home plus the percentage of salary you keep.
- [UK Salary Increase Calculator (Real Take-Home)](https://www.percentagecalculator.co.uk/tax/salary-increase/) — UK salary increase calculator: real take-home effect of a pay rise. 2026/27 income tax bands + NI + £100k taper. Example: £30k +5% = £1,036/yr net.
- [UK Effective Tax Rate Calculator](https://www.percentagecalculator.co.uk/tax/effective-tax-rate/) — Calculate your UK effective tax rate: total tax ÷ gross income. Worked example: £60k salary pays 23.4% effective (income tax 18.5% + NI 4.9%). Free 2026/27.
- [Marginal vs Effective Tax — and the 60% Trap](https://www.percentagecalculator.co.uk/tax/marginal-vs-effective/) — The difference between marginal and effective tax rates. Includes the 60% personal allowance trap between £100k and £125,140.
- [UK Salary Sacrifice Calculator](https://www.percentagecalculator.co.uk/tax/salary-sacrifice/) — Calculate the tax + NI saving from a salary sacrifice arrangement. Compare gross sacrifice to net cost and pension uplift.
- [UK Bonus Tax Calculator](https://www.percentagecalculator.co.uk/tax/bonus-tax/) — Calculate UK take-home on a bonus. £5k bonus on £40k salary loses ~42% to income tax + NI in that month. Worked example shows how PAYE smooths it.
- [UK Dividend Tax Calculator](https://www.percentagecalculator.co.uk/tax/dividend-tax/) — Dividend tax calculator using HMRC 2026/27 rates: £500 allowance, then 8.75% / 33.75% / 39.35% across basic/higher/additional bands.
- [Self-Assessment Tax Estimator](https://www.percentagecalculator.co.uk/tax/self-assessment/) — Estimate your self-assessment tax bill including payments on account at 50% twice a year. UK 2026/27.
- [UK Capital Gains Tax Calculator](https://www.percentagecalculator.co.uk/tax/capital-gains/) — CGT calculator with £3,000 annual exempt amount and 18%/24% rates by tax band. UK 2026/27.
- [UK Stamp Duty Calculator (England & NI)](https://www.percentagecalculator.co.uk/tax/stamp-duty/) — Stamp Duty Land Tax calculator with first-time buyer relief, second home surcharge, and 2026/27 tiered bands.
- [LBTT Calculator (Scotland)](https://www.percentagecalculator.co.uk/tax/lbtt/) — Calculate Scottish stamp duty (LBTT) on a property purchase. 2026/27 rates: 0% to £145k, 12% above £750k. Includes FTB relief + Additional Dwelling Supplement.
- [LTT Calculator (Wales)](https://www.percentagecalculator.co.uk/tax/ltt/) — Calculate Welsh stamp duty (LTT) on a property purchase. 2026/27: zero LTT below £225k, plus higher-rate slice for additional residential properties. Free.
- [UK Inheritance Tax Calculator](https://www.percentagecalculator.co.uk/tax/inheritance-tax/) — IHT calculator with £325k nil-rate band plus optional £175k residence nil-rate band. 40% above the threshold.
- [Compound Interest Calculator](https://www.percentagecalculator.co.uk/savings/compound-interest/) — Calculate UK compound interest with annual or monthly compounding. Worked examples: £10,000 at 5% for 10 years = £16,289 (annual) / £16,470 (monthly). Free.
- [ISA Growth Calculator](https://www.percentagecalculator.co.uk/savings/isa-growth/) — Project your Stocks & Shares ISA pot at retirement. £20,000 annual allowance for 2026/27.
- [Junior ISA Calculator](https://www.percentagecalculator.co.uk/savings/junior-isa/) — Junior ISA calculator. Up to £9,000/year per child, locked until age 18.
- [Lifetime ISA Bonus Calculator](https://www.percentagecalculator.co.uk/savings/lisa/) — Lifetime ISA bonus calculator. 25% government top-up on contributions up to £4,000/year.
- [Real Return Calculator](https://www.percentagecalculator.co.uk/savings/real-return/) — Calculate real (inflation-adjusted) return on savings. Subtract ONS CPI from your nominal interest rate.
- [Savings Goal Calculator](https://www.percentagecalculator.co.uk/savings/savings-goal/) — Calculate the % of income you need to save monthly to hit a target by a chosen date. Worked example: £20k for a house deposit in 5 years on a £35k salary.
- [Rule of 72 Calculator](https://www.percentagecalculator.co.uk/savings/rule-of-72/) — Calculate how long money takes to double using the Rule of 72: 72 ÷ annual return = years. Worked example: 6% return → 12 years; 8% → 9 years; 4% → 18 years.
- [Ongoing Charges Figure (OCF) Impact](https://www.percentagecalculator.co.uk/savings/ocf-impact/) — See how 1% fund OCF compounds against you over decades. UK platform fee + fund OCF erosion.
- [Investment Return Calculator](https://www.percentagecalculator.co.uk/savings/investment-return/) — Calculate UK investment return three ways: gross, net (after fees), and real (after CPI). Worked example: 7% gross at 0.5% fee, 3% CPI = 3.5% real.
- [Premium Bonds Calculator](https://www.percentagecalculator.co.uk/savings/premium-bonds/) — Calculate expected return on NS&I Premium Bonds using the 2026 prize fund rate (4.0%). Worked examples for £1k, £10k, and the £50k maximum holding.
- [UK Inflation Impact Calculator](https://www.percentagecalculator.co.uk/savings/inflation/) — See how inflation erodes the real value of savings or income over time. Uses ONS CPI.
- [Personal Savings Allowance](https://www.percentagecalculator.co.uk/savings/personal-savings-allowance/) — UK PSA: £1,000 (basic rate), £500 (higher), £0 (additional). Beyond it, savings interest is taxed.
- [Deposit as % of Property Price](https://www.percentagecalculator.co.uk/mortgage/deposit-percent/) — Calculate your deposit as a % of UK property price. UK norms: 5% (FTB), 10-15% standard, 25%+ best rates.
- [UK Loan-to-Value (LTV) Calculator](https://www.percentagecalculator.co.uk/mortgage/ltv/) — UK LTV calculator with rate-band tiers (60/75/85/90/95% LTV) explained.
- [Mortgage as % of Take-Home Pay](https://www.percentagecalculator.co.uk/mortgage/mortgage-vs-take-home/) — UK rule of thumb: housing should be under 35% of take-home. Calculator shows your ratio.
- [Stamp Duty by Buyer Type](https://www.percentagecalculator.co.uk/mortgage/stamp-duty-by-buyer/) — Calculate UK stamp duty (SDLT) by buyer type: first-time buyer (£0 to £425k), main residence, additional 5% for second homes. Worked examples on £350k purchase.
- [UK House Price Growth Calculator](https://www.percentagecalculator.co.uk/mortgage/hpi-growth/) — Calculate projected UK house price growth using Land Registry HPI rates. Worked example: £300k home at 4% annual HPI = £444k after 10 years (+£144k equity).
- [UK Home Equity Calculator](https://www.percentagecalculator.co.uk/mortgage/equity/) — Calculate UK home equity built from mortgage repayments + HPI growth. Example: £300k home, £60k deposit, 25-yr mortgage, 4% HPI = £180k equity in 10 years.
- [Mortgage Overpayment Calculator](https://www.percentagecalculator.co.uk/mortgage/overpayment/) — Overpaying a mortgage shortens the term and saves interest. Most UK lenders allow 10%/yr without penalty.
- [UK Mortgage Affordability Calculator](https://www.percentagecalculator.co.uk/mortgage/affordability/) — UK lenders typically cap at 4.5x income with FCA stress tests. Calculator shows max borrowing.
- [UK Buy-to-Let Yield](https://www.percentagecalculator.co.uk/mortgage/btl-yield/) — BTL yield calculator: gross (rent/value) and net (after costs and Section 24).
- [UK BTL Stress Test (PRA)](https://www.percentagecalculator.co.uk/mortgage/btl-stress-test/) — Buy-to-let stress test: rental coverage of 145% at a stress rate of 5.5%.
- [UK Profit Margin Calculator](https://www.percentagecalculator.co.uk/business/profit-margin/) — UK profit margin and markup calculator with worked examples.
- [Markup vs Margin](https://www.percentagecalculator.co.uk/business/markup-vs-margin/) — Convert between markup and margin percentages. The classic confusion explained.
- [UK Discount Calculator](https://www.percentagecalculator.co.uk/business/discount/) — Calculate sale prices and savings from a percentage discount.
- [UK Corporation Tax Calculator](https://www.percentagecalculator.co.uk/business/corporation-tax/) — UK CT calculator with 19% small profits rate, 25% main rate, and marginal relief.
- [UK IR35 Take-Home Comparison](https://www.percentagecalculator.co.uk/business/ir35/) — Compare contractor take-home pay inside vs outside IR35 with worked tax + NI + CT figures.
- [Conversion Rate Calculator](https://www.percentagecalculator.co.uk/business/conversion-rate/) — Calculate conversion rate: purchases ÷ visits × 100. UK e-commerce benchmarks: 1.5-2.5% typical, 3%+ strong. Example: 50 sales / 2,000 visits = 2.5%.
- [Churn Rate Calculator](https://www.percentagecalculator.co.uk/business/churn-rate/) — Calculate customer churn rate as % of customers lost over a period.
- [Gross Profit Calculator](https://www.percentagecalculator.co.uk/business/gross-profit/) — Calculate UK gross profit margin: (revenue − COGS) ÷ revenue × 100. UK benchmarks: SaaS 70-80%, retail 25-50%, services 50-70%. Worked example on £100k revenue.
- [Break-Even Calculator](https://www.percentagecalculator.co.uk/business/break-even/) — Calculate UK break-even revenue: fixed costs ÷ gross margin. Example: £100k fixed costs at 40% margin = £250k break-even. Worked UK SME scenarios.
- [Commission Calculator](https://www.percentagecalculator.co.uk/business/commission/) — Calculate UK sales commission as % of revenue or deal value. Worked example: 10% commission on £50k deal = £5k. Supports tiered commission and split structures.
- [HMRC Mileage Allowance (AMAP)](https://www.percentagecalculator.co.uk/business/mileage-allowance/) — HMRC Approved Mileage Allowance Payments calculator: 45p first 10,000 miles, 25p above.
- [UK Sale Discount Calculator](https://www.percentagecalculator.co.uk/lifestyle/sale-discount/) — Calculate UK sale prices: take any % off any price. Worked examples: 20% off £80 = £64; 30% off £150 = £105; 50% off £45 = £22.50. Free, no signup.
- [UK Tip Calculator](https://www.percentagecalculator.co.uk/lifestyle/tip/) — Tip calculator with UK service-charge convention: many UK restaurants add 10-12.5% optional service.
- [UK Energy Bill Saving](https://www.percentagecalculator.co.uk/lifestyle/energy-bill-saving/) — Calculate your saving from a % cut in energy bill. Anchored to Ofgem default cap.
- [UK Council Tax Band Comparator](https://www.percentagecalculator.co.uk/lifestyle/council-tax-bands/) — Calculate council tax across all bands A to H from your council's Band D rate. England fractions: A=6/9, B=7/9, C=8/9, D=9/9, E=11/9, F=13/9, G=15/9, H=18/9.
- [Inflation Impact Calculator](https://www.percentagecalculator.co.uk/lifestyle/inflation-impact/) — See how inflation erodes purchasing power over years using ONS CPI rates.
- [Body Fat % Calculator](https://www.percentagecalculator.co.uk/lifestyle/body-fat/) — Calculate body fat % using the US Navy method: height, waist, neck (and hip for women). Healthy ranges: men 14-24%, women 21-31%. Indicative only.
- [UK BMI Calculator](https://www.percentagecalculator.co.uk/lifestyle/bmi/) — Calculate BMI in metric or imperial. NHS healthy range 18.5–24.9; overweight 25–29.9; obese 30+. Indicative — speak to GP for personalised health advice.
- [Calorie Deficit Calculator](https://www.percentagecalculator.co.uk/lifestyle/calorie-deficit/) — Calorie deficit as % of TDEE. 10-20% is sustainable; 25%+ is aggressive.
- [Running Pace % Calculator](https://www.percentagecalculator.co.uk/lifestyle/pace/) — Calculate the % faster a target pace is than your current pace.
- [UK Tax-Free Childcare Calculator](https://www.percentagecalculator.co.uk/lifestyle/tax-free-childcare/) — Calculator for the UK Tax-Free Childcare scheme: 20% government top-up on childcare.
- [UK Universal Credit Taper Calculator](https://www.percentagecalculator.co.uk/lifestyle/universal-credit-taper/) — UC taper: 55p of UC withdrawn per £1 earned above your work allowance.
- [Test Score %](https://www.percentagecalculator.co.uk/education/test-score/) — Convert raw mark to percentage with approximate UK grade band.
- [Percent Error](https://www.percentagecalculator.co.uk/education/percent-error/) — Calculate percent error: |measured − actual| ÷ actual × 100. Worked examples for science experiments and engineering measurements. UK GCSE / A-Level friendly.
- [Percentile Calculator](https://www.percentagecalculator.co.uk/education/percentile/) — Calculate where a value falls in a distribution as a percentile.
- [Confidence Interval](https://www.percentagecalculator.co.uk/stats/confidence-interval/) — Calculate a 95% confidence interval from your sample mean and standard error. Worked example: mean 50, SE 5 → CI 40.2 to 59.8 (z = 1.96).
- [Margin of Error](https://www.percentagecalculator.co.uk/stats/margin-of-error/) — Margin of error in surveys: typically ±3% for 1,000 respondents.
- [Standard Deviation as % of Mean](https://www.percentagecalculator.co.uk/stats/std-dev-as-percent/) — Calculate the coefficient of variation: SD ÷ mean × 100. Worked example: mean 100, SD 5 → CV = 5%. Useful for comparing variability across different scales.
- [Z-Score → Percentile](https://www.percentagecalculator.co.uk/stats/z-score-percentile/) — Convert a z-score to its corresponding percentile.
- [Correlation Coefficient](https://www.percentagecalculator.co.uk/stats/correlation-percent/) — Calculate Pearson r as %, from −100% (perfect negative) to +100% (perfect positive). r² shows variance explained. Example: r = 0.8 → 80%.
- [Sharpe Ratio](https://www.percentagecalculator.co.uk/stats/sharpe-ratio/) — Calculate Sharpe ratio: (return − risk-free rate) ÷ SD. UK risk-free rate proxied by gilt yields. Worked example: 10% return, 4% gilt, 15% SD = Sharpe 0.4.
- [Beta](https://www.percentagecalculator.co.uk/stats/beta/) — Calculate stock beta: volatility vs market (FTSE 100 typical UK benchmark). Beta > 1 = more volatile; < 1 = less. Examples: 1.5 and 0.5.

## Quick percentage answers

The /percent/X-of-Y/ section contains 2445 pre-computed answers covering integer percentages 1–1000 against common UK values (10 to 250,000). Each page follows the pattern: direct answer in H1, the formula, step-by-step working, 3 FAQs, and 4 cross-links to neighbouring cells in the matrix.

Index page: https://www.percentagecalculator.co.uk/percent-of/x-of-y/
Sitemap (all 2,500+ URLs): https://www.percentagecalculator.co.uk/sitemap.xml

Representative samples (one per X-band):
- [5% of 35,000](https://www.percentagecalculator.co.uk/percent/5-of-35000/) — 5% of 35,000 is 1,750.
- [10% of 50](https://www.percentagecalculator.co.uk/percent/10-of-50/) — 10% of 50 is 5.
- [10% of 1,000](https://www.percentagecalculator.co.uk/percent/10-of-1000/) — 10% of 1,000 is 100.
- [15% of 200](https://www.percentagecalculator.co.uk/percent/15-of-200/) — 15% of 200 is 30.
- [20% of 150](https://www.percentagecalculator.co.uk/percent/20-of-150/) — 20% of 150 is 30.
- [20% of 35,000](https://www.percentagecalculator.co.uk/percent/20-of-35000/) — 20% of 35,000 is 7,000.
- [25% of 1,000](https://www.percentagecalculator.co.uk/percent/25-of-1000/) — 25% of 1,000 is 250.
- [33% of 300](https://www.percentagecalculator.co.uk/percent/33-of-300/) — 33% of 300 is 99.
- [40% of 50,000](https://www.percentagecalculator.co.uk/percent/40-of-50000/) — 40% of 50,000 is 20,000.
- [45% of 60,000](https://www.percentagecalculator.co.uk/percent/45-of-60000/) — 45% of 60,000 is 27,000.
- [50% of 200](https://www.percentagecalculator.co.uk/percent/50-of-200/) — 50% of 200 is 100.
- [50% of 500](https://www.percentagecalculator.co.uk/percent/50-of-500/) — 50% of 500 is 250.
- [60% of 1,000](https://www.percentagecalculator.co.uk/percent/60-of-1000/) — 60% of 1,000 is 600.
- [75% of 12,500](https://www.percentagecalculator.co.uk/percent/75-of-12500/) — 75% of 12,500 is 9,375.
- [90% of 100](https://www.percentagecalculator.co.uk/percent/90-of-100/) — 90% of 100 is 90.
- [100% of 100](https://www.percentagecalculator.co.uk/percent/100-of-100/) — 100% of 100 is 100.
- [110% of 1,500](https://www.percentagecalculator.co.uk/percent/110-of-1500/) — 110% of 1,500 is 1,650.
- [200% of 50](https://www.percentagecalculator.co.uk/percent/200-of-50/) — 200% of 50 is 100.
- [1000% of 250,000](https://www.percentagecalculator.co.uk/percent/1000-of-250000/) — 1000% of 250,000 is 2,500,000.