Miscellaneous Calculators
Specialty and home tools — paint, tiles, recipes. 14 free tools and counting.
The practical odds and ends: how much paint, tile or concrete a job needs, what an appliance costs to run, what the weather really feels like, and Ohm’s law for the electronics bench. Estimates deliberately include sensible waste margins — running out mid-job costs more than a little surplus.
Paint Coverage
Litres of paint needed to cover a room.
Tile Estimator
Number of tiles and boxes needed for a floor.
Recipe Scaler
Scale ingredient quantities up or down by servings.
Numerology
Life path number from a date of birth (just for fun).
Fuel Cost Calculator
Estimate the fuel cost of a trip from distance, economy and price.
Unit Price Calculator
Work out price per unit to compare product sizes.
Electricity Cost
Running cost of any appliance from its wattage and daily use.
Concrete Calculator
Concrete volume and bags needed for a slab, with waste allowance.
Ohm's Law
Solve voltage, current or resistance — with power — from the other two.
Wind Chill
What cold air really feels like once wind speed is factored in.
Heat Index
What hot weather really feels like once humidity is factored in.
Mulch, Gravel & Soil Calculator
Volume, weight and bags of landscaping material for any bed or path.
Roof Pitch Calculator
Pitch, angle, slope factor and rafter length from rise and run.
Resistor Colour Code
Decode a 4-band resistor into resistance and tolerance.