Photograph-style driveway apron, algae-stained concrete on the near side of one diagonal and bare wet clean concrete beyond it, a surface cleaner resting on the clean half

Free pressure washing calculators and surface guides

17
Calculators: 19
Guides: 18
Surfaces

Price a job by surface and square footage, look up the safe pressure and nozzle before you set the machine, and mix the chemistry to a number instead of a guess. Built for exterior cleaning contractors. No signup.

Price a job Surface PSI chart

Calculators

Pressure Washing Cost Calculator

Price any job from square footage, surface and soiling level.

Typical PSI: 1500-3500
Time / 1,000 sq ft: 18-30 min

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Driveway Cleaning Cost Calculator

Concrete driveway pricing by area, stain load and access.

Typical PSI: 3000-3500
Time / 1,000 sq ft: 20-25 min

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Surface PSI & Nozzle Chart

Safe pressure, nozzle and detergent for 18 exterior surfaces.

Surfaces: 18
PSI range: 100-4000

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Soft Wash Mix Calculator

Dilute 12.5% SH to a target mix ratio for siding or roof.

Target mix: 0.5-3.0%
Tank sizes: 5-100 gal

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Pressure Washer Nozzle Chart

The five colour-coded nozzles, their degrees and safe surfaces.

Nozzles: 5
Spray angles: 0-40 deg

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Downstream Injector Calculator

Work out the mix that actually leaves the gun at the wall.

Draw ratio: 1:8-1:20
Wall mix: 0.5-3.0%

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All 17 calculators

Photograph-style concrete patio slab half cleaned along a diagonal

Photograph-style two-car driveway half cleaned along a diagonal

Before

Soiling: 3 years, north side
Last cleaned: 2023
Streaking: Heavy, shaded half

After

Pressure used: 3200 PSI
Nozzle: 25 deg green
Time on site: 92 min
Cost per sq ft: $0.31

A worked example from the driveway guide, priced with the site’s own bands.

Surfaces, at a glance

Flatwork

Poured concrete driveway

Pressure3000-3500

Nozzle 25 deg

Degreaser pre-treat, dilute SH post-treat

Vertical

Vinyl siding

Pressure100-500 (soft wash)

Nozzle ~65 deg

0.5-1.5% SH + surfactant

Wood

Cedar and softwood decking

Pressure500-1200

Nozzle 40 deg

Sodium percarbonate, neutralising rinse

Roof & gutter

Asphalt shingle roof

PressureSoft wash only

Nozzle ~65 deg

~3% SH, 15-20 min dwell

By category

Pricing & Estimating

Photograph-style measuring wheel lying across the line where stained concrete meets bare wet clean concrete

9 tools · 2 guides

Surfaces & Techniques

Photograph-style three material samples laid on gravel — a concrete paver, a timber board and a vinyl panel — with one diagonal crossing all three from weathered to clean

2 tools · 10 guides · 1 compares

Equipment & Chemicals

Photograph-style brass hose fittings and a plain white jug on the wiped-clean half of a galvanised trailer deck

4 tools · 4 guides · 3 compares

Business & Operations

Photograph-style hose reel in the back of an open work van, its hose running out to a surface cleaner on the clean half of a concrete apron

2 tools · 3 guides

Guides

Pressure Washing Prices: What Jobs Actually CostPer-square-foot and per-job bands by surface, and what moves them.9 min How Much to Charge for Pressure WashingBuild a rate from your own machine, chemical and labour cost.8 min How to Pressure Wash a DrivewayPre-treat, surface-clean, edge and post-treat, in that order.8 min Cleaning Vinyl Siding Without Etching ItWhy siding is a soft-wash job and what pressure actually does.8 min Concrete Cleaning: Pressure, Chemistry, OrderSurface cleaner passes, overlap, and the post-treat that keeps it clean.9 min Removing Oil Stains From ConcreteDegreaser, poultice and hot water, and when the stain is permanent.7 min

All 19 guides

Start with the number you have to defend

Surface PSI chart

Every calculator here runs in your browser, prints to one page, and shows the method behind the price — pressure, nozzle, detergent.

Open the cost calculator