Skip to main content
CalcThai.
← Back to services

Custom calculator demo · calcthai.com

From measured area to a clear quotation

Adjust the area and your business prices to see paint quantities, labour and an itemised quotation update together.

Demonstration: all starting values and prices are illustrative. They are not market rates or an offer of painting services from calcthai.com.

Total before tax: 11,300.00 THBView quotation ↓
1. Area to paint

m² · Include the walls or ceilings to paint. Measure on site before actual use.

m² · For example, doors and windows. Must be smaller than gross area.

2. Paint and material prices

coats · 1–10

m²/L · Use the paint label and actual surface conditions.

% · 0–100

L · 0.1–1,000

THB/tin · Before tax. Whole tins are rounded up.

3. Labour and other costs

THB/m² · Includes ALL entered coats; charged against the area once.

THB · A fixed charge per job, before tax.

THB · A fixed charge per job, before tax.

Quotation details

Entered details are used on this page only. Project details are not saved or sent to calcthai.com. Changing language or reloading resets the example.

Net area100 m²
Paint including waste22 L
Purchased volume3 tins

calcthai.com DEMO

Sample quotation

Demonstration only · not a confirmed offer

Project
Sample painting project
Reference
DEMO-001
Date
—

Currency: Thai baht (THB)

Sample quotation
ItemAmount
Finish paint3 tins × 1,500.00 THB4,500.00
Painting labour100 m² × 60.00 THB6,000.00
Preparation and equipment1 job × 500.00 THB500.00
Transport1 job × 300.00 THB300.00
Total before tax11,300.00 THB

Estimate inputs

Net area: 120 − 20 = 100 m²

Coats: 2 · Coverage: 10 m²/L · Waste: 10%

Paint including waste: Approx. 22 L · Tin size: 9 L

Purchased volume: 3 × 9 = 27 L

Includes ALL entered coats; charged against the area once.

Excludes VAT, primer, wall repairs and scaffolding. Check the site and confirm the scope with the responsible person before actual use.

Labour is rounded to satang before summing. Paint is charged by whole tins. Displayed litres are approximate and do not determine tin rounding.

↑ Back to inputs

Opens your browser’s print dialog, where you can save as PDF. The document keeps its sample label.

How the estimate works

  1. Net area = gross area − unpainted area
  2. Paint needed = net area × coats ÷ coverage per litre × (1 + waste ÷ 100)
  3. Tins = paint needed ÷ tin size, rounded up to whole tins
  4. Total = tins × price per tin + net area × labour rate + preparation + transport

Make it fit your business

Adapt the formula, materials, design and quotation to the agreed scope, with examples for acceptance checks.

See deliverables and send a brief →