86
tools
Home & workshop
How much concrete, paint, tile or cable the job takes, and what the wiring behind it has to carry.
12V amp calculator Current a 12 volt load pulls, and the fuse it wants. →230V power calculator Watts, amps and circuit headroom on a 230 volt supply. →24V amp calculator Current at 24 volts — half the amps of the same load at 12. →4 band resistor calculator The common four-band code, two digits, a multiplier, a tolerance. →5 band resistor calculator Three significant digits — the precision resistor code. →6 band resistor calculator Five-band precision plus a temperature coefficient band. →Ah to Wh converter Capacity to energy, at your voltage. →Air conditioner BTU calculator The cooling capacity a room needs, in BTU, watts and tons. →Amp to watt calculator Watts from a measured current, what a clamp meter reading means. →AWG to mm converter One AWG number in, diameter and square millimetres out. →Battery capacity calculator Amp-hours and watt-hours, and how much of it you can actually use. →Battery charge time calculator Hours to charge, from the current state and the charger current. →Battery runtime calculator How long a battery lasts at a given load. →Board foot calculator Thickness × width × length ÷ 144. →Cable size calculator The smallest standard conductor that keeps the drop inside your limit. →Capacitor charge time calculator How long a capacitor takes to reach a given voltage. →Capacitor parallel calculator Capacitors in parallel simply add, the opposite of resistors. →Capacitor series calculator Series capacitance, where the reciprocal sum applies instead. →Ceiling area calculator Ceiling area and the paint or board it takes. →Cement calculator Cement, sand and aggregate for a mix you are batching yourself. →Concrete calculator Cubic yards, cubic metres and bag counts for a slab, footing or post. →Current calculator Amps a load draws, and the breaker size that suits it. →Current divider calculator How a current splits between two parallel resistors. →Decking calculator Deck boards, joists and screws for a timber or composite deck. →Dew point calculator When the air will start condensing. →Drill size calculator Fractional, number and letter drills in millimetres. →Electricity cost calculator What a device costs to run, by the day, month and year. →Energy consumption calculator Annual consumption for a load that runs part of the time. →Fence calculator Posts, rails and pickets for a run of fence. →Fence post calculator Post count, hole depth and the concrete each hole swallows. →Flooring calculator Packs of laminate, vinyl or engineered board for a room. →Fuel cost calculator What a journey costs in fuel, split by passenger if you like. →Gas mileage calculator MPG, l/100 km and cost per mile from one fill-up. →Gravel calculator Tonnes and bulk bags of gravel for a drive, path or soakaway. →Grout calculator Kilograms of grout from tile size, joint width and depth. →Heat index calculator What the heat feels like with humidity. →Inductor calculator Reactance, stored energy and the LC resonance an inductor sets. →Inverter size calculator Continuous and surge rating, plus the DC current it will pull. →kW to amp calculator Line current for a kilowatt rating, single or three phase. →kWh calculator Kilowatt-hours an appliance uses, per day, month and year. →LED power calculator Watts, running cost and equivalent brightness for an LED run. →LED resistor calculator The series resistor an LED needs, and the wattage it must be. →mAh to Wh converter Needs the voltage, that is the whole point. →Metric thread calculator Tap drill and clearance for any M size. →mm to AWG converter A metric cable size in, the nearest American gauge out. →MPG calculator Miles per gallon, both kinds, with the metric equivalents. →Mulch calculator Bags and cubic yards of mulch for a bed, at a depth that actually works. →Ohm's law calculator Give it any two, get the other two. →Paint calculator Litres and tins for a room, with doors and windows taken off. →Parallel resistor calculator Combined resistance of any number of resistors in parallel. →PCB trace width calculator Trace width for a current and temperature rise, to IPC-2221. →Pool volume calculator Litres and gallons in a pool, and the pump flow it needs. →Power calculator Watts from any two of volts, amps, ohms, plus kVA and horsepower. →Pull-down resistor calculator Holding an input at ground without fighting the driver. →Pull-up resistor calculator The usable range for a pull-up, between rise time and sink current. →Radiator size calculator Heat output in watts and BTU for a room, and how many radiators that is. →RC time constant calculator Tau, rise time and the cutoff frequency of an RC pair. →Resistance calculator Ohms from any two other values. →Resistor color code calculator Read any 4, 5 or 6 band resistor into a value and tolerance. →Resistor value to color code The reverse lookup, a value in, the bands out. →Resistors in parallel calculator Reach a value you do not stock by paralleling two you do. →Resistors in series calculator Total of a series chain, with how the voltage splits across it. →Road trip cost calculator Fuel, refuel stops and the per-person share for a long drive. →Roof pitch calculator Pitch as a ratio, an angle and a percentage, plus the rafter multiplier. →Room area calculator Floor, wall and ceiling area plus volume, from one room measurement. →Sand calculator Sand by tonne, bulk bag or barrow for bedding, sandpits and screed. →Screw spacing calculator Even gaps, with fixings at both ends. →Series resistor calculator A resistor in series to drop voltage or limit current. →Single phase power calculator Watts, VA and current on an ordinary single-phase supply. →Solar battery calculator Battery bank size for the days of autonomy you want. →Solar panel size calculator Array size and panel count for a daily energy target. →Square feet calculator Square feet from any shape, converted to metres and yards. →Stair calculator Risers, treads, stringer length and the angle, from one measurement. →Three phase power calculator kW, kVA and line current for a balanced three-phase load. →Tile calculator Tiles, boxes and adhesive for a floor or wall, waste included. →Tire size calculator Overall diameter from a sidewall code, and what a change does to your speedo. →Voltage calculator Volts from current and resistance, or from power and current. →Voltage divider calculator Output voltage from two resistors, and the R2 that hits your target. →Voltage drop calculator Volts lost down a cable run, as a figure and a percentage. →Wall area calculator Net wall area with doors and windows taken off. →Wallpaper calculator Rolls of wallpaper for a room, including the pattern repeat. →Watt to amp calculator Amps from watts at any voltage, with the breaker size beside it. →Watt to volt calculator Voltage from a wattage and a known current or resistance. →Wh to Ah converter Energy back to capacity. →Wind chill calculator What the cold actually feels like. →Wire gauge calculator AWG to mm², with diameter, resistance and a rough ampacity. 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