Invoice Generator
Create a professional invoice with taxes, discounts and your logo, then download it as PDF or print it.
Browse by need
Business documents
Quote Generator
Prepare a clear quote or estimate for your client, with validity date, taxes and totals, ready as PDF.
Tax
VAT Calculator
Add or remove VAT from any amount and see the net price, the tax and the gross price instantly.
Pricing & profit
Profit Margin Calculator
Find your profit and margin from cost and price, or the price you need for a target margin.
Markup Calculator
Turn a cost into a selling price with a markup percentage or multiplier, and see the resulting margin.
Discount Calculator
See the final price and the amount saved after one or two successive discounts.
Break-Even Calculator
Find how many units and how much revenue you need to cover your fixed and variable costs.
Freelance & sales
Freelance Hourly Rate Calculator
Work out the hourly and daily rate you need from your target income, costs, time off and billable hours.
Commission Calculator
Calculate a sales commission with a flat rate or tiered rates, and the amount left after commission.
Everyday maths
Percentage Calculator
Percent of a number, what percent one number is of another, and percentage increase or decrease.
BUILNORA
BUILNORA — tools for construction
Quantities for concrete, blocks and bricks, rebar, screed, paint and tiles, with waste margins built in, for professionals and serious DIY.
BUILNORA
Concrete Calculator
Volume of concrete for slabs, footings and columns, with waste margin and cement, sand and gravel quantities.
BUILNORA
Paint Calculator
How much paint you need for your walls and ceilings, minus doors and windows, for the number of coats you plan.
BUILNORA
Tile Calculator
Number of tiles and boxes for a floor or wall, with grout joints and a cutting waste margin.
BUILNORA
Block & Brick Calculator
Blocks or bricks, mortar and cement bags for a wall, with openings deducted and a breakage margin.
BUILNORA
Rebar Weight Calculator
Weight of reinforcing steel from diameter and length, laps included, and the 12 m bars to buy.
BUILNORA
Screed Calculator
Volume of floor screed and the cement bags, sand and water needed for your area and thickness.
Why PRAXAO
Free and unlimited
Every tool is free to use as often as you need. No sign-up, no trial, no watermark.
Exact calculations
Amounts are computed with exact decimal arithmetic and correct rounding for each currency.
Private by design
Your figures are calculated in your browser. We do not sell data and collect only anonymous usage statistics.
Five languages
English, French, Spanish, German and Arabic, with localized numbers, currencies and documents.