Pay & allowances
UK personal allowance taper
Calculate the UK standard personal allowance remaining after the £100,000 adjusted-net-income taper for 2026–27.
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Pay & allowances
UK salary after income tax and NI — estimate
Estimate UK employment salary after annual income tax and employee NI, with separate Scottish income-tax bands and a monthly average.
Text & writing
Unicode inspector
Unicode inspector: List code points in hexadecimal; maximum 1,000 code points
Text & writing
Unicode text normalization
Unicode text normalization locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Business & selling
Unit price
Unit price: Price per unit = total price ÷ quantity
Dates & time
Unix timestamp converter
Unix timestamp converter: Unix seconds count elapsed time since 1970-01-01T00:00:00Z; offset required for ISO input
Developer & data
Unpivot wide CSV columns
Unpivot wide CSV columns: Keep the selected identifier; turn every other cell into a separate row with the source column name and cell value.
Pay & allowances
Unused holiday pay estimate
Estimate the gross value of payable unused holiday days using the eligible daily pay supplied by your employer.
Developer & data
URL component encoding
URL component encoding: Encode or decode a URL component; not an entire URL
Developer & data
URL query builder and parser
Build, append or inspect a URL query string with browser-standard encoding, duplicate parameter support and no network request.
Text & writing
URL slug generator
URL slug generator: Normalize accents, lowercase, replace non-ASCII-alphanumeric runs with hyphens
Taxes & fees
US federal income tax — taxable income
Estimate 2026 US federal tax on ordinary taxable income after deductions, before credits, for four filing statuses. Excludes state tax and FICA.
Pay & allowances
US Social Security and Medicare withholding
Calculate 2026 employee Social Security and Medicare withholding, including the wage cap and the employer Additional Medicare trigger.
Pay & allowances
US standard deduction — base amount
Find the 2026 US base standard deduction for single, married or head-of-household filing, with eligibility limits stated.
Developer & data
UTF-8 text and binary converter
Encode text as 8-bit UTF-8 binary bytes or decode binary bytes into validated UTF-8 text.
Developer & data
UTF-8 text and hexadecimal bytes
UTF-8 text and hexadecimal bytes: Encode text with UTF-8 and format each byte as two hexadecimal digits; decode pairs of hex digits using a fatal UTF-8 decoder.
Developer & data
UUID format and version checker
UUID format and version checker locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Random generators
UUID v4 generator
UUID v4 generator: Web Crypto randomUUID generates a random version 4 UUID
Math & statistics
Variance
Variance: Sum squared deviations from mean ÷ N (population) or N−1 (sample)
Taxes & fees
VAT / GST calculator
VAT / GST calculator: Inclusive: net = gross/(1+rate); exclusive: gross = net×(1+rate). Output is the tax amount.
Developer & data
vCard 3.0 contact file generator
vCard 3.0 contact file generator: Escape text backslashes, commas, semicolons and line breaks; emit a UTF-8 vCard 3.0 with FN, EMAIL, TEL and ORG fields.
Travel & transport
Visa application fee budget
Budget adult and child visa fees, service charges and document costs for the US, UK, Canada, Australia or Europe.
Unit converters
Volume converter
Volume converter: result = amount × source factor ÷ destination factor. Factors are relative to L.
Home & construction
Wallpaper roll quantity
Estimate whole wallpaper rolls from strip height, roll dimensions, trimming and an optional straight-match pattern repeat.
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