All calculators

Solar, batteries, cable sizing, UPS runtime and EV charging.

• Off-Grid Solar & Battery Calculator How many solar panels and batteries you need, from what you actually run in a day. Open calculator →
• Wire Gauge Calculator Cable size from amps, distance and voltage — AWG or mm², with voltage drop, resistance and parallel runs. Open calculator →
• UPS Runtime Calculator How many minutes your UPS really holds your gear up, by battery rather than by guesswork. Open calculator →
• EV Charging Calculator How long a charge takes, what it costs at home, and how much you save against filling a fuel tank. Open calculator →

Generator sizing, cost, fuel, watts, kVA and household load.

• Generator Size Calculator Size it from your appliances, or from your floor area and panel — with the surge load included. Open calculator →
• Watts Calculator Convert between watts, amps, volts and kilowatt-hours — DC, single-phase or three-phase. Open calculator →
• Home Wattage Calculator How many watts your house actually uses — average draw, everything-at-once peak, and the monthly bill. Open calculator →
• kVA Calculator Convert kVA to kW, amps and horsepower — single or three-phase, with power factor handled properly. Open calculator →
• Whole House Generator Cost Calculator The full installed cost of a generator — unit, transfer switch, gas line, pad, labour and permit. Open calculator →
• Generator Fuel Calculator How much fuel a generator burns, how long a tank lasts, and what an outage costs per day. Open calculator →

Resin, candles, soap, 3D printing, yarn, fabric and pricing.

• Epoxy Resin Calculator Work out how much resin a mould, river table or tumbler actually takes, split by part A and B. Open calculator →
• Candle Making Calculator How much wax and fragrance oil a batch of candles needs, plus a wick size for your jar. Open calculator →
• Soap Lye Calculator Work out exactly how much lye and water your oils need, with superfat and a full safety brief. Open calculator →
• 3D Print Cost Calculator The real cost of a print — filament, power, wear and failures — and what to charge for it. Open calculator →
• Yarn Calculator How much yarn a blanket, scarf or hat takes — by craft, stitch density and yarn weight. Open calculator →
• Fabric Calculator How much fabric a project needs, with hems, seams and pattern repeat already added. Open calculator →
• Vinyl & Sticker Pricing Calculator What to charge for decals, shirts and signs once materials, labour and marketplace fees are in. Open calculator →

Mulch, pavers, wallpaper, paint, decking, fencing and grass seed.

• Mulch Calculator Cubic yards, bags or tons of mulch, soil or gravel for any number of beds. Open calculator →
• Paver Calculator Paver count, gravel base, bedding sand and edging for a patio or path. Open calculator →
• Wallpaper Calculator How many rolls a room needs, counted by strips rather than square footage. Open calculator →
• Paint Calculator Gallons of paint for a room, with coats, doors, windows and ceiling accounted for. Open calculator →
• Deck Board Calculator Board count, linear feet, screws and joists for a deck of any size. Open calculator →
• Fence Calculator Posts, panels, pickets, rails and concrete for a fence run of any length. Open calculator →
• Grass Seed Calculator Pounds of seed or pallets of sod for a lawn, by grass type and whether you are seeding or overseeding. Open calculator →

Dog food portions, cat calories, chicken flocks and aquariums.

• Raw Dog Food Calculator Daily raw food portions by body weight or calories, with monthly quantity and cost. Open calculator →
• Chicken Coop Calculator Coop size, run size, nest boxes, feed and eggs for a backyard flock — in either direction. Open calculator →
• Aquarium Calculator Tank volume, heater wattage, filter turnover and an honest stocking check. Open calculator →
• Cat Calorie Calculator Daily calories for a cat, converted into cups of dry or cans of wet food. Open calculator →

Pool chemicals, sourdough, coffee, barbecue, parties, tips and rates.

• Pool Chemical Calculator How much chlorine and acid your pool needs, worked out from its actual volume. Open calculator →
• Sourdough Calculator Scale any sourdough recipe by baker's percentages, with true hydration worked out properly. Open calculator →
• Coffee Ratio Calculator How many grams of coffee for any brew method, cup count and strength. Open calculator →
• BBQ Calculator How much meat to buy for a cookout, adjusted for kids, appetite and sides. Open calculator →
• Party Drink Calculator Beer, wine, spirits, mixers and ice for any guest count and party length. Open calculator →
• Tip & Bill Split Calculator Split a bill evenly or by what each person ordered, with tax and tip shared fairly. Open calculator →
• Freelance Rate Calculator Work backwards from the money you want to keep to the hourly rate you have to charge. Open calculator →