Trade Calculator logoTrade Calculator

Job-site math, without the signal.

Ready offline

Measure twice.
Calculate once.

Nine field tools for fast estimates—built to stay clear, thumb-friendly, and useful when reception disappears.

Feet & inches to metric

Enter a site measurement. Fractional inches are supported.

01 / 09
Field tip: Decimal inches work directly—enter 6.5 for 6½ inches. Negative values are supported for elevations and offsets.

Concrete volume

Estimate slabs, walls, and rectangular footings.

02 / 09
Add 10% wasteAllowance for spillage and uneven grade
Planning estimate only. Confirm final volume with your ready-mix supplier. Bag yield varies by product and mixing conditions.

Lumber board feet

Calculate volume from rough dimensions and piece count.

03 / 09
Formula: thickness (in) × width (in) × length (ft) ÷ 12 × pieces. Use the dimensions your supplier prices from—nominal and actual sizes give different totals.

Wire ampacity reference

Quick 75°C conductor lookup for common AWG sizes.

04 / 09
Wire sizeAmpacityAreaMaterial

Reference conditions: 75°C-rated conductors, not more than three current-carrying conductors in a raceway or cable, and 30°C ambient. Values are based on the common 75°C column of NEC Table 310.16. Terminal ratings, conductor rules, continuous loads, correction factors, voltage drop, and local code can require a different result. Canadian and other jurisdictions may differ. Always verify with the current code and authority having jurisdiction.

Roofing materials

Estimate sloped roof area, squares, and shingle bundles.

05 / 09
Method: plan area × pitch factor, then waste. One roofing square equals 100 ft². Bundle coverage varies—use the number printed by the shingle manufacturer.

Drywall sheets

Estimate sheets for repeated walls after openings.

06 / 09
Planning estimate: total wall-face area minus openings, plus waste, divided by sheet area. Round up and confirm layout before ordering.

Tile quantity

Estimate tiles and boxes for a rectangular surface.

07 / 09
Ordering tip: increase waste for diagonal patterns, complex cuts, or future repairs. Confirm box coverage and dye lot with the manufacturer.

Paint calculator

Estimate paint for interior walls, coat by coat.

08 / 09
Planning estimate only. Coverage varies with surface texture, colour change, and product—check the rate printed on the can and confirm quantities with your supplier before ordering.

Brick & block

Count bricks or concrete blocks for a single-wythe wall, plus mortar.

09 / 09
Planning estimate only. Modular brick (3⅝ × 2¼ × 8 in) with ⅜ in mortar joints works out to about 6.55 bricks per ft², and mortar at roughly one 60 lb bag per 35 bricks. Openings, corners, and bond pattern change the totals—confirm counts with your supplier.

Saved projects

Estimates you save from any calculator, kept on this device only.

No saved calculations yet. Run any calculator, then tap Save project on its result to add the estimate here with a name.

Materials list

One combined order list from every calculator. Add results, set your prices, then share the order with your supplier.

Your materials list is empty. Run a calculator (Concrete, Paint, Tile, Brick…), then tap ＋ Add to materials list on its result to build one combined order.

Quantities include each calculator's waste allowance. Prices are yours to enter — totals are planning estimates only, so confirm pricing with your supplier.

Privacy Policy

How Trade Calculator handles your information.

This policy explains our privacy practices in simple terms and reflects Canada’s Personal Information Protection and Electronic Documents Act (PIPEDA).

  1. What we collect

    We use the numbers you type for calculations and any project names you choose. They are stored on your device only.

  2. Why we use it

    We use this information only to run trade calculations and help you identify saved project files.

  3. Consent

    By using Trade Calculator, you agree to the practices described in this policy.

  4. Data sharing

    We NEVER sell your data. Nothing leaves your device, and the app works fully offline.

  5. Your rights

    You can delete saved project files from your device at any time.

  6. Children

    Trade Calculator is not directed at children under 13.

  7. Security

    We use reasonable safeguards designed to protect information handled by the app. You are also responsible for keeping your device secure.

  8. Changes

    If this policy changes, the updated policy and its date will be shown in the app.

  9. Contact

    For privacy questions, contact: privacy@[your-domain].com

Last updated: October 2026

*80 lb bag count uses an approximate 0.60 ft³ yield per bag. Manufacturer yield governs.