Friendly calculators and utilities
TallyKind
Work out what matters with clear calculators for pay, childcare, property, savings, unit conversions, and code tasks. Adjust the assumptions, compare scenarios, and get useful charts on desktop or phone.
Tool library
Pick the thing you are working out
Each tool gives you editable inputs, detailed outputs, charted results, clear assumptions, and related tools to keep the next step close.
UK Take Home Pay Calculator
Estimate UK take-home pay from salary, pension salary sacrifice, tax region, and student-loan plan.
Open toolPropertyStamp Duty Calculator
Estimate England and Northern Ireland residential SDLT using selected rule periods, buyer type, and surcharges.
Open toolParentsBaby Feed Calculator
Estimate daily milk volume, feed size, and simple supply planning for expressed, breast, or formula feeds.
Open toolMoney
UK-ready salary, pension, ISA, mortgage, compound growth, and FIRE calculators.
Property
Stamp duty, rental yield, mortgage affordability, renovation, and area-adjusted price tools.
Parents
Childcare eligibility, baby feeds, sleep schedules, nappies, nursery costs, and childcare-hours planning.
Developer
Cron, SQL, JSON, regex, JWT, API, UUID, timestamp, database, and CSS utilities.
General
Everyday unit conversion, online-income planning, and practical catch-all tools.
Clear by design
Adjust the assumptions, then see the impact
The tools are built for quick checks and deeper comparisons, with mobile-friendly back navigation and outputs that show what was assumed.
Charts included
Scenario charts make repayment paths, growth projections, tax splits, and cost stacks easier to scan.
Assumptions visible
Tax years, rates, buffers, and eligibility checks appear in the inputs or notes where they matter.
Easy on mobile
Calculator pages include app-style back controls and layouts that keep inputs and results usable on small screens.
Before you decide
Useful estimates, not final advice
The calculators are designed for planning and comparison. Check tax, mortgage, payroll, childcare, and legal decisions against official guidance or a qualified professional before acting.