Plan your next project with precision. Calculate exact material quantities, estimate costs and figure out profitable selling prices — all in your browser.
Every successful DIY project starts with accurate planning. Whether you are pouring your first batch of candles or tiling a kitchen backsplash, knowing your exact material quantities before you start saves money, eliminates waste and prevents those frustrating mid-project supply runs. Guessing leads to buying too much or too little — neither is ideal when you are working to a budget or a deadline.
These calculators go beyond simple quantity math. Each one includes a built-in cost estimator so you can enter your local material prices and see the true cost of your project before you commit. For makers who sell their creations, understanding material cost per unit is the foundation of profitable pricing. You cannot set a fair selling price if you do not know what each item costs to produce.
The craft supply calculators cover the most popular making disciplines. The candle calculator handles wax density by type — soy, paraffin, beeswax, coconut-soy blends — and accounts for fragrance load percentages so you get precise wax and fragrance oil weights for any jar size. The soap calculator manages the chemistry of cold-process soap making, calculating lye and water ratios with adjustable superfatting percentages for different oil combinations.
For resin crafters, the resin calculator computes exact resin-to-hardener ratios for rectangular, cylindrical and custom mould shapes. The yarn calculator tells you how many balls or skeins you need based on your gauge, project dimensions and yarn weight. The fabric calculator handles pattern layout for garments and quilts, while the macrame calculator works out cord lengths for wall hangings and plant hangers based on finished dimensions and knot density. The tie-dye calculator rounds out the craft tools by computing dye powder, soda ash and water volumes for any batch of garments.
The home improvement tools tackle the projects that homeowners and contractors face most often. The paint calculator covers walls, ceilings and trim with manufacturer-standard coverage rates, giving you litre and tin counts with a built-in waste allowance. The tile calculator handles floor and wall tiling with adjustable wastage percentages and tells you how many boxes to buy based on your chosen tile size.
The wallpaper calculator accounts for pattern repeats — the detail most people forget — and calculates the exact number of rolls for your room dimensions. The concrete calculator supports slabs, footings and post holes, converting volume into bags or ready-mix cubic metres. The fence calculator computes posts, rails and pickets for standard fence styles based on your total run length. Finally, the curtain calculator handles fullness ratios, hem allowances and header styles so you buy the right amount of fabric the first time.
Many DIY makers eventually start selling their creations online. The cost estimator built into each craft calculator gives you a per-unit material cost, which is the first number you need when setting a profitable price. Once you know that a single candle costs you a certain amount in wax, fragrance oil, wick and jar, you can apply standard markup multipliers to arrive at a retail price.
But material cost is only part of the equation. When you sell on an online marketplace, the platform takes a percentage in fees — listing fees, transaction fees, payment processing fees and sometimes shipping label commissions. To see your real take-home profit, use the marketplace fee calculators on fixnow.tools. Enter your selling price and the fee calculator shows exactly what you keep after every deduction. Together, the DIY calculators and fee calculators give you a complete picture: what it costs to make, what you charge, and what you actually earn.
Yes, all 16 DIY and craft calculators on fixnow.tools are completely free. There is no login, no account required, and no usage limits. Every calculation runs in your browser so your data never leaves your device.
Each calculator includes an optional cost estimator. Enter your material prices (wax per kg, paint per litre, fabric per metre, etc.) and the calculator automatically works out the total material cost for your project. Some tools also suggest selling prices based on common markup multipliers.
Absolutely. The calculators are designed for both hobbyists and small business owners. The cost estimation features help you understand your material costs per unit so you can set profitable selling prices. You can then use the marketplace fee calculators on fixnow.tools to see your real profit after platform fees.
Yes. Every DIY calculator supports both metric (grams, millilitres, metres, litres) and imperial (ounces, fluid ounces, feet, gallons) units. You can toggle between the two at any time and your values convert automatically.
The calculators use standard industry formulas and material densities. For example, the candle calculator accounts for wax density by type, the concrete calculator uses standard bag yields, and the paint calculator uses manufacturer-standard coverage rates. Results are estimates — always buy a small surplus to account for waste and spillage.