Free online calculators

Official FDIC estimator for whether bank deposits are within insurance limits.

Free UK benefits calculator that estimates what a household may claim.

Estimates federal, state and local income tax for the current filing year.

Tests whether a retirement portfolio would have survived each historical market period.

Estimates free-space path loss and received power between two antennas.

Official estimate of child maintenance payments from income and care arrangements.

Official calculator for statutory paid holiday based on working pattern.

Official employer calculator for statutory redundancy pay in the UK.

Computes compound interest on a deposit or investment for a chosen compounding frequency.

Finds the number of hours and minutes between two clock times.

Affordable home price from annual income, debts and down payment.

Calculates press-fit pressure and stress for shaft and hub assemblies.

Shows how much a regular investment could grow to by retirement.

Finds resistor and capacitor values for a target cutoff frequency of RC filters.

Works out resistor values for series and parallel LED arrays from the supply voltage.

Gives the series resistor needed to drive an LED from a supply voltage.

UK income tax and take-home pay calculator for the 2026-27 tax year.

Picks the resistor pair or computes output voltage for an LM317 regulator.

Monthly repayments and interest for a loan or mortgage, with optional overpayments.

Index of ham radio calculators for antennas, attenuators, resonance and power units.

Estimates characteristic impedance of a PCB microstrip line from geometry.

Mortgage payment estimate with amortization schedule, payoff chart and extra-payment options.

Simulates long-term portfolio growth and retirement survival with random return paths.

Estimates the Canadian home price you can afford from income, debts and down payment.