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Free calculators for your projects

Work out materials, measurements, costs and energy use. Enter your values and explore clear results with formulas and examples.

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56 tools · 8 categories · Formulas explained

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Minimum Selling Price CalculatorCalculate a minimum selling price from unit cost, fixed fees, sales commission and target margin. Keep your pricing assumptions consistent.Open calculator
Round Cake Pan ConverterResize a recipe for a different round cake pan using its inside diameter and filling depth. Find the ingredient multiplier from pan volumes.Open calculator
Print Resolution (DPI) CalculatorCalculate effective image resolution from pixel dimensions and print size. Check horizontal and vertical DPI before preparing a print file.Open calculator
Drip Irrigation Flow CalculatorEstimate total dripper flow and water used in one watering session from the number of plants, emitters, rated flow and running time.Open calculator
Cushion Fabric CalculatorEstimate fabric for cushions from panel dimensions, seam allowances and usable roll width. Compare uniform rotation and see the panel layout.Open calculator
Silicone Sealant CalculatorCalculate sealant volume for rectangular or triangular joints. Add several joints and compare cartridge quantities, surplus and optional prices.Open calculator
Battery Runtime CalculatorEstimate battery runtime from volts and amp-hours or watt-hours. Adjust usable capacity and efficiency, then compare two constant power loads.Open calculator
Planter Soil CalculatorCalculate soil litres and bags for rectangular, cylindrical or tapered planters using internal dimensions, fill depth and reserved volume.Open calculator
Box Fit CalculatorCheck whether an item fits inside a box with padding on each side. Compare box dimensions and optional order costs using axis-aligned orientations.Open calculator
Batch Production Cost CalculatorCalculate cost per usable item from a production batch, including rejected units. Use a known total or itemised materials, labour and overhead.Open calculator
Recipe Scaling CalculatorScale one ingredient or an entire recipe to a new serving count. Keep ingredient units, import a list and export the scaled quantities as CSV.Open calculator
Print Run Cost CalculatorEstimate total print-run cost and cost per usable copy from setup charges, variable production cost and a waste percentage.Open calculator
Curtain Fabric CalculatorEstimate curtain fabric from opening width, fullness, finished drop, hems and roll width. Allow for vertical pattern repeats and whole fabric widths.Open calculator
Wallpaper Roll CalculatorEstimate wallpaper rolls from wall length, height, roll size, pattern repeat and trimming allowance. Counts complete strips without deducting openings.Open calculator
Furniture Paint CalculatorEstimate paint litres and cans for furniture from surface area, coats, product coverage and extra allowance. Round the purchase up to whole cans.Open calculator
Gravel Quantity CalculatorCalculate gravel volume, weight and bags for a path or garden area from depth, surface area and material density, with an optional allowance.Open calculator
Battery Charging Time CalculatorEstimate battery charging time from capacity, starting and target charge, charging power and efficiency using a constant-power energy model.Open calculator
Tank Filling Time CalculatorEstimate how long a container takes to fill from the volume still needed and a constant flow rate. Convert litres and litres per minute into time.Open calculator
Break-Even CalculatorFind the sales quantity needed to cover fixed costs using selling price and variable cost per unit. Check the contribution and break-even point.Open calculator
Reorder Point CalculatorCalculate an inventory reorder threshold from average daily demand, supplier lead time and your chosen safety stock. Uses whole-unit rounding.Open calculator
Plant Spacing CalculatorEstimate plant counts for a rectangular area from row and plant spacing. Uses complete spacing cells in a regular planting grid.Open calculator
Pond Volume CalculatorEstimate pond capacity in litres and cubic metres from regular dimensions and average depth. Supports rectangular and oval surface shapes.Open calculator
Vinyl Roll CalculatorEstimate vinyl roll length for equal rectangular pieces from roll width, piece size, quantity and spacing using fixed-direction rows.Open calculator
Print Bleed CalculatorCalculate document dimensions after adding equal print bleed to every edge. Enter the final trim size and the bleed requested by your printer.Open calculator
Food Trim Yield CalculatorCalculate preparation waste, edible yield and cost per usable kilogram from purchased weight, usable weight and purchase cost.Open calculator
Cost per Serving CalculatorCalculate recipe cost per serving from ingredients, additional costs and portion count. Use consistent prices to compare the cost of each portion.Open calculator
Production Capacity CalculatorEstimate complete production units from parallel lines, shift minutes, shift count, cycle time and overall efficiency in a simplified model.Open calculator
Delivery Route Cost CalculatorEstimate route cost and cost per delivery from distance, fuel consumption, fuel price, tolls and other explicit trip expenses.Open calculator
Chair Upholstery Fabric CalculatorEstimate fabric for equal rectangular chair panels from seat dimensions, allowances, chair count and usable roll width, without rotating pieces.Open calculator
Box Storage Capacity CalculatorEstimate how many equal boxes fit in a rectangular storage space. Compare six uniform box orientations without mixing the packing arrangement.Open calculator
Lighting Energy Cost CalculatorCalculate lamp energy use and variable electricity cost from lamp count, wattage, daily hours, days and your entered energy tariff.Open calculator
Skirting Board CalculatorEstimate skirting board or baseboard lengths and stock pieces from room perimeter, door openings, extra allowance and commercial board length.Open calculator
Wall Slat CalculatorEstimate vertical wall slats and stock pieces from wall dimensions, slat width, spacing and available stock length in a uniform layout.Open calculator
Concrete Footing Volume CalculatorEstimate concrete volume for equal rectangular footings using length, width, depth, quantity and an optional allowance. Not a structural design tool.Open calculator
Tile and Box CalculatorEstimate tiles and boxes for an area from tile dimensions, tiles per box and a waste allowance. Useful for a surface-based purchase estimate.Open calculator
Tile Grout CalculatorEstimate tile grout volume and weight from tiled area, tile dimensions, joint width, depth, product density and an additional allowance.Open calculator
Appliance Electricity Cost CalculatorEstimate appliance energy use and cost during operation and standby from wattage, daily hours, quantity, days and your electricity tariff.Open calculator
Resistive Voltage Drop CalculatorEstimate resistive voltage drop from cable length, current, cross-section and resistivity. An approximate calculation, not a cable-sizing certificate.Open calculator
Three-Phase Power CalculatorCalculate apparent and active power for a balanced three-phase system from line-to-line voltage, line current and power factor.Open calculator
Cylindrical Tank Volume CalculatorCalculate capacity and liquid volume for a vertical or horizontal cylindrical tank from internal diameter, axis length and fill level.Open calculator
Mulch Volume CalculatorEstimate mulch litres, cubic metres and bags from the area to cover, layer depth and an optional extra allowance for purchasing material.Open calculator
Irrigation Water Cost CalculatorEstimate monthly irrigation water use and cost from zone flow, session length, watering frequency, water tariff and an allocated fixed charge.Open calculator
Garden Edging CalculatorEstimate garden edging lengths and pieces from boundary perimeter, gaps, stock-piece length and extra allowance, without optimising cuts.Open calculator
Volumetric Weight CalculatorCalculate a parcel's dimensional weight from its outer dimensions and an editable divisor. Compare it with actual weight before carrier-specific rules.Open calculator
Box Cubic Metres CalculatorCalculate the combined cubic volume of equal boxes from external dimensions and box count. Convert centimetre measurements into cubic metres.Open calculator
Boxes per Pallet CalculatorEstimate boxes per pallet using two uniform layer orientations, usable height and maximum load. Compare geometric capacity with a weight limit.Open calculator
Packaging Cost CalculatorCalculate packaging cost per order from the box, filler, label, tape and preparation time. Multiply by order count using a consistent tax basis.Open calculator
Supplier Cost Comparison CalculatorCompare two supplier offers with unit price, minimum order and shipping. Include surplus purchases when calculating cost per unit actually wanted.Open calculator
Order Profit CalculatorEstimate order result and sales margin from net revenue and explicit product, delivery, packaging, commission and other costs.Open calculator
Baker's Percentage and Hydration CalculatorCalculate dough hydration and salt percentage with direct flour, water and an optional preferment breakdown. Check total baker's percentages.Open calculator
Cooked Recipe Yield CalculatorCalculate cooked-recipe yield from initial and final mass and estimate final weight per serving. Allows yields above 100% when water is absorbed.Open calculator
Labels per Sheet CalculatorEstimate rectangular labels or pieces per sheet with margins and gaps. Compare uniform orientations without generating a calibrated print template.Open calculator
Circle Skirt CalculatorCalculate inner and outer radii for full, half or quarter-circle skirts from waist and length. Check a reference piece width, not fabric metres.Open calculator
Rainwater harvesting calculatorEstimate collectable rainwater from horizontal catchment area, rainfall and collection percentage. Storage capacity and drinking-water quality are not assessed.Open calculator
Slope percentage and angle calculatorCalculate uphill slope as a percentage and in degrees, plus inclined length, from vertical rise and horizontal distance. No building compliance check is made.Open calculator
Brine concentration by mass calculatorCalculate salt to add to water for a target percentage of the total water-and-salt mass. This differs from salt as a percentage of water and does not assess food safety.Open calculator