Calculators
All calculators for maths, dates, finance, electrical work, construction and IT. Explore 28 free online tools.
Mathematics
- Online CalculatorA simple, fast calculator for everyday sums with keyboard support.
- Scientific CalculatorFree online scientific calculator with trigonometry, logarithms, powers and roots.
- Percentage CalculatorCalculate a percentage of a number, plus increases and decreases.
- Percentage Change CalculatorCalculate the percentage increase or decrease between two values.
- Fraction CalculatorAdd, subtract, multiply and divide fractions.
- Ratio CalculatorSolve proportions and simplify ratios.
- Average CalculatorFind the mean, median, sum, minimum and maximum of a list of numbers.
Date & Time
Finance
- Investment CalculatorSee how a one-off and monthly investment grows with compound returns.
- Tip CalculatorCalculate the tip, the total and how much each person pays.
- Compound Interest CalculatorEstimate how your savings or investment grow over time.
- Loan Payment CalculatorCalculate the monthly payment of a loan or mortgage.
- Discount CalculatorCalculate the sale price and how much you save.
Electrical & Energy
- Watts to AmpsConvert power in watts to current in amps for DC and AC circuits.
- Amps to WattsConvert current in amps to power in watts for DC and AC circuits.
- Ohm's Law CalculatorCalculate voltage, current, resistance and power.
- Voltage Drop CalculatorEstimate the voltage drop in copper and aluminium cables.
- Battery Runtime CalculatorEstimate how long a battery can power a load.
- Electricity Cost CalculatorCalculate how much it costs to run an appliance.
- Solar Panel Output CalculatorEstimate the energy production of a solar PV system.
Construction
- Concrete Volume CalculatorCalculate how much concrete you need for a slab or footing.
- Tile CalculatorCalculate how many tiles you need for a floor or wall.
- Paint CalculatorEstimate how much paint you need for your walls.
- Stair CalculatorCalculate the number of steps, step height, run and angle of a staircase.
- Floor Area CalculatorCalculate the area of a rectangular room in m² and ft².
- Pipe Volume CalculatorCalculate how much water a pipe holds.