ToolStack UK — Free Online Calculators: Tax, Property, Finance & Health

Calculate inheritance tax (IHT) on UK estates with nil-rate band, RNRB, and gift adjustments.

Work out your statutory redundancy pay entitlement based on age, service, and weekly pay.

Calculate CGT on property, shares, and other assets with the correct 2026/27 rates.

Find your fertile window, ovulation date, and plan for pregnancy based on your cycle.

See how much tax relief you get on pension contributions and project your pot's growth.

Analyse rental property returns — gross/net yield, monthly cash flow, and total ROI.

All calculators are free to use. Updated for the 2026/27 tax year where applicable.