health.bsa Unreviewed
Body surface area in m² by the Mosteller and the DuBois & DuBois formulas, to 2 decimal places.
bodySurfaceArea in TypeScriptUnreviewed capabilities
Ordered by level: primitives at the bottom of the graph, workflows at the top. Each one carries its own tests, at least 8 per function.
Unreviewed: rules (tax, payroll, legal, clinical and the like) that pass their tests in every language but await sign-off by a qualified expert. Treat them as drafts.
Suites — the capabilities a kind of app is built from: accounting, payroll, an online shop, a clinic…
Collection: React form elements — accessible form components for React, and the pure helpers they use.
Level 0 primitive
health.bmi Unreviewed
Adult body mass index (kg/m², 1 decimal place) and its NICE/WHO weight category.
bmi in TypeScript
health.age-in-months Unreviewed
Age in completed months and days on a given date, for paediatric charts and doses; month ends handled like birthdays.
ageInMonths in TypeScriptLevel 1 generic concept
agri.spray-mix Unreviewed
Sprayer tank mix: tank fills, and product and water per full and part tank, for an area, water volume and dose.
sprayMix in TypeScript
health.waiting-time Unreviewed
NHS England referral-to-treatment (RTT) wait in days and weekly bands, with the 18-week breach flag.
rttWaitingTime in TypeScript
insurance.excess-apply Unreviewed
Claim payout after the compulsory and voluntary excess, capped at the policy limit.
applyExcess in TypeScript
invest.cagr Unreviewed
Compound annual growth rate between two values over a whole or fractional number of years, in basis points.
cagr in TypeScript
payroll.tax-code-parse Unreviewed
Parse a UK PAYE tax code (1257L, K475, BR, D0, NT, 0T, S and C prefixes, W1/M1/X) into its allowance and flags.
parseTaxCode in TypeScript
property.council-tax-band Unreviewed
Council tax for a valuation band from the Band D charge: the statutory band ratio, England, Wales and Scotland.
councilTaxBand in TypeScript
property.rental-yield Unreviewed
Gross and net rental yield of a let property, in basis points, from annual rent, costs and value.
rentalYield in TypeScript
health.gestational-age Unreviewed
Gestational age (weeks+days) and estimated due date from the last menstrual period by Naegele's rule, cycle-adjusted.
gestationalAge in TypeScript
health.egfr Unreviewed
eGFR in mL/min/1.73 m² by the race-free CKD-EPI 2021 creatinine equation, from creatinine in µmol/L or mg/dL.
egfrCkdEpi2021 in TypeScript
health.nhs-number-format Unreviewed
Display an NHS number in the 3-3-4 format ("943 476 5919") after checking its modulus 11 check digit.
formatNhsNumber in TypeScript
insurance.age-banding Unreviewed
Age at policy inception and the rating band it falls in, from a table of age bands.
ageBand in TypeScript
insurance.loss-ratio Unreviewed
Loss ratio, expense ratio and combined ratio in basis points, from earned premium, incurred claims and expenses.
lossRatios in TypeScript
invest.dividend-yield Unreviewed
Trailing and forward dividend yield of a share or fund, in basis points, from the price and the dividends per unit.
dividendYield in TypeScript
invest.isa-allowance Unreviewed
ISA allowance used and remaining for a UK tax year: the overall limit, Lifetime ISA, cash ISA and Junior ISA.
isaAllowance in TypeScript
invest.portfolio-weights Unreviewed
Each holding's share of a portfolio and its drift from a target weight, in basis points, from exact arithmetic.
portfolioWeights in TypeScript
lending.ltv Unreviewed
Loan-to-value ratio in basis points, and the band it falls in from a band table you supply.
loanToValue in TypeScript
payroll.notice-period Unreviewed
Statutory minimum notice in weeks from continuous service: one week per year from two years, capped at twelve.
statutoryNotice in TypeScript
payroll.pro-rata-salary Unreviewed
Salary for part of a pay period and for part-time hours, by calendar days or working days, rounded once.
proRataSalary in TypeScript
property.deposit-cap Unreviewed
Maximum tenancy deposit a landlord may take: five or six weeks' rent under the Tenant Fees Act 2019.
depositCap in TypeScript
property.floor-area Unreviewed
Floor area from room lengths and widths, exactly, with the total in both square metres and square feet.
floorArea in TypeScript
property.holding-deposit-cap Unreviewed
Maximum holding deposit to reserve a rental property: one week's rent (annual rent ÷ 52), rounded down.
holdingDepositCap in TypeScript
property.rent-proration Unreviewed
Rent for part of a month from the monthly rent, by the annual-daily or the calendar-month method.
prorateRent in TypeScriptLevel 2 domain function
finance.tax.remove-vat Unreviewed
Extract the VAT already included in a gross amount, using the rate in force on the date of supply.
removeVat in TypeScript
insurance.sum-insured-average Unreviewed
Average clause settlement for underinsurance: the loss times sum insured over value at risk, capped at the loss.
averageClauseSettlement in TypeScript
payroll.overtime Unreviewed
Pay for the time worked in a period split into multiplier bands: basic, time and a half after 40 hours, double time.
overtimePay in TypeScript
finance.tax.add-vat Unreviewed
Add VAT to a net amount using the rate in force on the date of supply.
addVat in TypeScript
invest.bond-yield Unreviewed
Current yield and yield to maturity of a fixed-coupon bond from its clean price, as Excel's YIELD defines it.
bondYield in TypeScript
lending.early-settlement Unreviewed
Early settlement figure and rebate on UK regulated consumer credit, per the Early Settlement Regulations 2004.
earlySettlement in TypeScript
fleet.tachograph-rest Unreviewed
Check daily and weekly rest against GB/EU drivers' hours: 11h daily (9h reduced, 3+9 split), 45h weekly (24h reduced).
checkTachographRest in TypeScript
health.dose-weight-based Unreviewed
Weight-based dose (per kg) capped at a maximum single dose and rounded to a measurable volume, in exact micro-units.
weightBasedDose in TypeScript
lending.apr Unreviewed
Consumer-credit APR from drawdowns and repayments, by the FCA CONC App 1.2.6 equation, to one decimal place.
apr in TypeScript
payroll.minimum-wage-check Unreviewed
Check pay for a pay reference period against the minimum or living wage for age and apprenticeship.
minimumWageCheck in TypeScript
payroll.student-loan Unreviewed
Student loan or postgraduate loan deduction from one period's pay, by plan, rounded down to whole pounds.
studentLoan in TypeScript
property.mortgage-affordability Unreviewed
Mortgage affordability: the loan-to-income multiple and a stress-tested repayment against income, both checked.
mortgageAffordability in TypeScript
property.service-charge-apportion Unreviewed
Apportion a service charge across units by lease fraction, floor area or fixed percentage, exact to the penny.
apportionServiceCharge in TypeScript
insurance.no-claims-discount Unreviewed
No-claims discount at renewal: earn a year, or step back after claims on the insurer's scale, with NCD protection.
nextNoClaimsDiscount in TypeScript
invest.rebalance Unreviewed
Whole-unit buy and sell trades that bring a portfolio back to target weights, skipping trades below a minimum size.
rebalance in TypeScript
invest.time-weighted-return Unreviewed
Time-weighted return from valuations taken at each external cash flow, geometrically linked exactly.
timeWeightedReturn in TypeScript
legal.time-billing Unreviewed
Fees from time entries: each rounded to 6-minute (or other) units and priced at the fee earner's hourly rate.
timeBilling in TypeScript
lending.affordability Unreviewed
Debt-to-income and a stressed-rate affordability test for a proposed loan's monthly repayment.
affordability in TypeScript
payroll.national-insurance Unreviewed
Employee and employer Class 1 National Insurance for one payment by category letter, exact percentage method.
nationalInsurance in TypeScript
finance.tax.vat-flat-rate Unreviewed
UK VAT Flat Rate Scheme: VAT due on gross turnover at the sector's dated rate, limited cost rate and first-year 1% off.
flatRateVat in TypeScript
finance.tax.vat-rate Unreviewed
Look up the VAT rate in force for a jurisdiction, category and date.
vatRate in TypeScript
health.appointment-slots Unreviewed
Bookable appointment slots from clinic sessions, a slot length, breaks and existing bookings.
appointmentSlots in TypeScript
invest.fee-drag Unreviewed
What an annual charge costs an investment over the years: value with and without the fee, year by year, in minor units.
feeDrag in TypeScript
invest.pension-annual-allowance Unreviewed
UK pension annual allowance for a tax year with taper, MPAA and three-year carry-forward, and the excess charged.
pensionAnnualAllowance in TypeScript
legal.disbursements-vat Unreviewed
Whether a cost passed to a client is a VAT disbursement (outside scope) or a recharge (VAT due), per HMRC Notice 700.
disbursementVat in TypeScript
payroll.holiday-pay-accrual Unreviewed
UK holiday pay: 12.07% rolled-up holiday pay, or a week's pay averaged over the last 52 paid weeks.
holidayPay in TypeScript
payroll.statutory-sick-pay Unreviewed
UK Statutory Sick Pay for sickness spells: waiting days, 8-week linking, 28-week limit and the rate by date.
statutorySickPay in TypeScript
fleet.company-car-bik Unreviewed
UK company car benefit in kind: appropriate percentage by CO2 and electric range, car and fuel benefit for a tax year.
companyCarBik in TypeScript
fleet.drivers-hours Unreviewed
Check a driver's activities against GB/EU drivers' hours: breaks after 4.5h, daily, weekly and fortnightly driving.
checkDriversHours in TypeScript
health.news2 Unreviewed
NEWS2 early warning score from one set of observations: parameter scores, aggregate and RCP clinical risk band.
news2Score in TypeScript
health.qrisk-inputs-validate Unreviewed
Check a QRISK3 cardiovascular risk input set against the calculator's published ranges; does not compute risk.
validateQriskInputs in TypeScript
hospitality.allergen-matrix Unreviewed
Which of the 14 UK major allergens a dish contains or may contain, from its ingredients' declared allergens.
allergenMatrix in TypeScript
insurance.claim-reserve Unreviewed
Claim reserve history: paid, recovered, outstanding and incurred after each transaction, and the movement.
claimReserveHistory in TypeScript
insurance.instalment-plan Unreviewed
Pay a premium by monthly instalments: deposit, flat credit charge, instalments exact to the penny, and the APR.
instalmentPlan in TypeScript
insurance.ipt Unreviewed
UK Insurance Premium Tax at the standard or higher rate in force on a date, added to or taken out of a premium.
insurancePremiumTax in TypeScript
insurance.mid-term-adjustment Unreviewed
Additional or return premium for a mid-term policy change, pro rata on the days left, plus an admin fee.
midTermAdjustment in TypeScript
insurance.premium-proration Unreviewed
Return premium on mid-term cancellation, pro rata or on a short-period scale, with an optional minimum retained premium.
cancellationReturnPremium in TypeScript
insurance.rating-factors Unreviewed
Premium from a base rate times factor-table lookups, loadings and discounts, within minimum and maximum premiums.
ratePremium in TypeScript
invest.capital-gains-tax Unreviewed
UK Capital Gains Tax for an individual's tax year: losses, annual exempt amount, and the rates by asset and date.
capitalGainsTax in TypeScript
invest.money-weighted-return Unreviewed
Money-weighted return (XIRR) of dated cash flows on Excel's actual/365 convention, solved exactly in fixed point.
moneyWeightedReturn in TypeScript
invest.section-104-pool Unreviewed
UK share matching for CGT: same-day, 30-day bed-and-breakfast, then the Section 104 pool; allowable cost per disposal.
section104Pool in TypeScript
legal.conflict-name-match Unreviewed
Fuzzy-match a name against existing clients and parties for a conflict check: normalised, token-sorted Jaro-Winkler.
conflictNameMatch in TypeScript
legal.court-deadline Unreviewed
A deadline in days under CPR 2.8: clear days, short periods skip weekends and bank holidays, court-closed days.
courtDeadline in TypeScript
legal.court-fee Unreviewed
The court fee to issue a money claim in England and Wales, from the claim value bands in force on a date.
courtFee in TypeScript
legal.limitation-date Unreviewed
The last day to bring a claim under the Limitation Act 1980, by claim type, from the date it accrued.
limitationDate in TypeScript
legal.retainer-drawdown Unreviewed
Apply money held on account in client account to bills in order: what each bill takes, what stays due, what is left.
retainerDrawdown in TypeScript
legal.statutory-interest Unreviewed
Statutory interest on a judgment debt (8% simple, daily) or a late commercial debt, England and Wales.
statutoryInterest in TypeScript
lending.daily-interest Unreviewed
Interest accrued day by day on a changing balance under a day-count convention, summed exactly and rounded once.
dailyInterest in TypeScript
lending.loan-payment Unreviewed
Level repayment for a loan (annuity formula), computed exactly and rounded once, the way you choose.
loanPayment in TypeScript
logistics.duty-estimate Unreviewed
Estimate import duty and import VAT on goods: customs value on a CIF basis, the caller's duty rate, VAT on top.
dutyEstimate in TypeScript
payroll.holiday-entitlement Unreviewed
UK statutory holiday: 5.6 weeks capped at 28 days and pro-rated, or 12.07% accrual for irregular hours.
holidayEntitlement in TypeScript
payroll.income-tax Unreviewed
PAYE income tax for one pay period from a tax code, cumulative or week 1/month 1, by HMRC's tax table routines.
incomeTax in TypeScript
payroll.pension-auto-enrolment Unreviewed
Workplace pension contributions for one pay period: qualifying earnings band, employee and employer shares, tax relief.
pensionContributions in TypeScript
payroll.redundancy-pay Unreviewed
Statutory redundancy pay from age, completed years of service (at most 20) and a week's pay capped by date.
statutoryRedundancyPay in TypeScript
payroll.statutory-maternity-pay Unreviewed
UK Statutory Maternity Pay: LEL eligibility and 39 weekly amounts, 90% then the lower of 90% or the flat rate.
statutoryMaternityPay in TypeScript
payroll.tax-period Unreviewed
The UK PAYE tax week, tax month and payroll period number that a pay date falls in, weeks 53, 54 and 56 included.
taxPeriod in TypeScript
property.rent-review Unreviewed
New rent after an index-linked (CPI/RPI) rent review, with an optional collar and cap and upward-only option.
rentReview in TypeScript
property.stamp-duty Unreviewed
Stamp duty on a property purchase: SDLT (England, NI), LBTT (Scotland), LTT (Wales), with reliefs and surcharges.
stampDuty in TypeScript
retail.sales-tax-us Unreviewed
US sales tax on a sale: the state's base rate from dated data plus a local rate the caller supplies.
salesTaxUs in TypeScriptLevel 3 business operation
finance.tax.vat-return Unreviewed
UK nine-box VAT return totals for a period from categorised sales and purchases (VAT Notice 700/12).
vatReturn in TypeScript
invest.drawdown-sustainability Unreviewed
How many years a pension or investment pot lasts under a yearly withdrawal and a constant growth rate, year by year.
drawdownSustainability in TypeScript
lending.amortisation-schedule Unreviewed
Repayment schedule for a level-payment loan: interest, principal and balance per period, ending at exactly zero.
amortisationSchedule in TypeScript
property.completion-statement Unreviewed
A buyer's completion statement: price less deposit, ground rent and service charge apportioned to completion, plus fees.
completionStatement in TypeScript
lending.overpayment-effect Unreviewed
What a one-off overpayment does to a loan: a shorter term at the same payment, or a lower payment over the same term.
overpaymentEffect in TypeScript
payroll.gross-to-net Unreviewed
A UK payslip for one pay period: gross pay, pension, PAYE tax, National Insurance, student loans and net pay.
grossToNet in TypeScript
payroll.net-to-gross Unreviewed
The gross pay that gives at least a target net pay in one UK pay period, found by a deterministic search.
netToGross in TypeScript