I'll develop an online calculator for the cost of window and door insulation with sealing strips

I'll make a ready online calculator for your website that calculates the exact cost of window and door insulation with sealing strips — without manager calls and lengthy coordination. The client specifies the number of openings, selects the sealing strip type (silicone, polyurethane, EPDM rubber or self-adhesive tape), enters approximate glazing area and immediately sees the total amount including installation. This reduces the load on the sales department and increases conversion — the visitor sees the price immediately rather than going to look for competitors.

I write the calculator in pure JavaScript, without heavy frameworks, so it loads quickly and doesn't conflict with scripts already installed on your website. Calculation formulas, material prices and installation work costs I put in a separate settings panel — you'll be able to change rates yourself, add new sealing strip types or regions without contacting the developer. The layout is responsive: the calculator works equally well on phones, tablets and desktops.

At the end of work, I transfer the source code, instructions for connecting to CMS and editing prices, and I'm ready to refine the logic for your rates (volume discounts, urgency markup, separate calculation for balcony blocks). I stay in touch during development, show intermediate versions, make edits quickly.

What's included in the work:
— calculation by number of openings and glazing area;
— selection of sealing strip type with different price per meter;
— accounting for installation work costs as a separate line;
— responsive layout for mobile devices;
— panel for independent price editing;
— request submission form with calculation to manager;
— connection to existing website without design changes;
— operating instructions and edit guidelines