Free online calculators

Computes timer prescaler and compare values for AVR timer interrupts on Arduino.

Backtests an asset allocation, showing returns, volatility and drawdowns.

Relates signal rise time to bandwidth and the trace length at which it acts like a transmission line.

Estimates how long a battery will last for a given load current.

Estimates distance to a Bluetooth device from RSSI and path loss exponent.

German gross-to-net salary calculator (German language) for 2026 taxes and social contributions.

Finds reactions, shear, moment and deflection for a cantilever beam.

Gives stored energy and time constant for a capacitor with a series resistor.

Estimates tax owed on long-term and short-term investment gains.

Backtests a retirement withdrawal plan against historical returns and inflation.

Calculates resistor values that set the thresholds of a comparator with hysteresis.

Compounded balance of a deposit over a chosen number of years and compounding period.

Shows savings growth for daily, monthly or yearly compounding.

Official US calculator for buying-power change between two months using CPI data.

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.

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