Pool Toolkit

Free pool calculators & quick tools for pool owners

Practical pool calculations without the guesswork

Pool Toolkit gives pool owners free calculators for water volume, chlorine dosing, water balance, salt systems, circulation, heating, seasonal care, and troubleshooting. Choose a calculator below, enter your pool information, and use the result as a starting estimate alongside current test results and the product label.

Every calculator page includes plain-language guidance so you can understand what the number means, not just copy a dose.

Browse the full calculator link directory

A plain HTML directory of all live tools is available here as a backup to the searchable calculator grid below.

Getting Started

Pool Volume CalculatorGallons / Liters from pool shape & dimensions
Spa/Hot Tub Volume CalculatorEstimate spa gallons from dimensions

Balance (Core)

Borates Dose CalculatorBoric acid / borax dosing to target ppm
Calcium Hardness (CH) AdjusterCalcium chloride dose to raise CH
CYA / Stabilizer (Granular) CalculatorHow much stabilizer to reach a target CYA
LSI / CSI Calculator (Plaster & SWG)Calc saturation index and recommended range
pH Adjuster CalculatorHow much acid or soda ash to move pH
TDS Helper (When it matters)Quick guidance on TDS and practical actions
Test Kit Dilution HelperDilution math for high readings
Total Alkalinity (TA) AdjusterBaking soda / acid dosing to reach target TA
Water Temperature ConverterFahrenheit ↔ Celsius

Balance (Extended)

Acid Demand Test HelperTurn demand drops into ounces
Ammonia Recovery HelperGuidance + testing steps
Base Demand Test HelperTurn demand drops into ounces
Borate pH Buffer HelperBorate benefits/cautions reference
CH to CSI Impact ViewerSee how CH changes CSI
Clarifier Dose HelperEstimate dosing + cautions
Enzyme Dose Reminder HelperWeekly enzyme planning
Flocculant Dose HelperDose estimate + settling steps
pH Drift Helper (Aeration/TA)Why pH rises and what to do
Phosphate Remover DoseDose estimate by phosphate level (education)
Salt to CSI Impact ViewerSee how salt changes CSI
TA to CSI Impact ViewerSee how TA changes CSI
Temperature to CSI Impact ViewerSee how temp changes CSI

Chlorine & Sanitizers

Biguanide (PHMB) Basics HelperDecision helper & conversion notes
Bleach Strength ConverterConvert % strength and dose equivalents
Bromine Dose CalculatorBromine bank / oxidizer estimate
Cal-Hypo Dose CalculatorDose calculator for calcium hypochlorite (granular)
Chloramine / Breakpoint Chlorination HelperEstimate breakpoint dosing (education)
Chlorine Cost per ppm (Compare Products)Compare liquid vs tabs vs cal-hypo cost
Chlorine Dose (Liquid) CalculatorHow much liquid chlorine to add for a target FC rise
CYA Increase from Tabs EstimatorEstimate CYA added over time
Dichlor Dose CalculatorFC rise + CYA side effect estimate
ORP vs FC Reference HelperHow ORP relates (and doesn’t) to FC
Spa Chlorine Dose (Liquid)Liquid chlorine dosing for spas
Trichlor Tab Dose CalculatorFC rise + CYA & pH/TA impact estimate

SLAM & Algae

Algaecide Dose (Polyquat 60)Polyquat dosing (non-copper)
Combined Chlorine (CC) Interpretation HelperWhat CC means + action steps
Mustard Algae High-FC TargetHigher FC target based on CYA (post-SLAM)
Overnight Chlorine Loss Test (OCLT) TrackerLog sunset/sunrise FC and auto-calc loss
Shock / SLAM Target Calculator (Liquid)Target FC based on CYA and SLAM level
SLAM Progress Log (FC/CC)Daily log with notes and milestones

Salt & SWG

Should I Convert My Pool to Salt?Compare conversion cost, payback time, convenience, and compatibility
Salt Cell Life Remaining EstimatorEstimate equivalent operating hours used and remaining cell life
Salt Cell Cleaning Frequency HelperPlan inspection frequency from scale risk and cell condition
Salt Add CalculatorHow much salt to reach SWG target ppm
Salt Cell Output / Run TimeEstimate chlorine production vs run time
SWG Sizing RecommendationPick a cell size based on demand

Circulation & Filters

DE Finger Replacement PlannerPlan DE element replacement from age, damage, and pressure
Multiport Valve TroubleshooterIdentify common valve checks from operating symptoms
Sand vs Cartridge Pool FilterCompare maintenance, water use, debris, and filtration priorities
Robot vs Suction Pool CleanerCompare price, debris handling, plumbing, and convenience
Cartridge Filter Square-Foot RecommendationEstimate minimum cartridge area from design flow
Pool Filter Velocity CalculatorCalculate filter loading rate and face velocity
Filter Cartridge Replacement EstimatorEvaluate age, pressure recovery, cleaning, and physical damage
Backwash Water Loss EstimatorEstimate gallons lost per backwash
Cartridge Filter Cleaning Interval HelperCleaning frequency guidance + log
DE Filter: DE Recharge CalculatorHow much DE to add after backwash
Filter Pressure Delta TrackerLog clean/dirty PSI and cleaning triggers
Flow Rate Estimator (Pipe/Head)Rough flow estimate helper
Pump Run Time PlannerSchedule run time based on goals
Sand Filter: Sand Amount FinderEstimate sand weight for filter size
Skimmer & Weir Diagnostic ChecklistStep-by-step walkthrough of common skimming problems.
Skimmer Symptom CheckerCheck your symptoms and get ranked likely fixes.
Turnover Time CalculatorEstimate turnover based on flow and volume

Equipment & Plumbing

Pool Bypass Valve CalculatorEstimate bypass percentage and equipment-branch flow
Pool Automation Relay PlannerCount required relays and available automation capacity
Should I Replace My Pool Pump?Compare repair cost, energy savings, age, and ownership plans
Variable-Speed Pump Savings CalculatorCompare annual electricity cost, savings, and payback
Pool Pump GPM CalculatorCalculate required flow from turnover and feature demand
Pool Pump Affinity Law CalculatorEstimate flow, head, and power changes with pump speed
Deck Jet Flow EstimatorRough flow per jet guidance
Filter Size RecommendationChoose filter size for pool volume
Pipe Volume (Per Foot) CalculatorGallons in pipe by diameter and length
Pump HP / Flow Reality CheckUnderstand pump ratings (education)
Quick Skimmer & Return SizingFast count recommendation based on pool volume and shape.
Skimmer & Return Count PlannerDetailed planning by pool size, wind exposure, surface features, and circulation goals.
Waterfall Pump EstimatorFlow needed per width

Heating & Energy

Heat Pump vs Gas Pool HeaterCompare warm-up speed, climate, and estimated energy cost
Is My Pool Heater Worth Repairing?Compare repair cost, heater age, efficiency, and reliability
Is a Solar Pool Cover Worth It?Estimate water savings, annual value, and simple payback
Pool Heater Warm-Up Time CalculatorEstimate heating time from gallons, temperature rise, and output
Pool Solar Heater Sizing & Panel QuantityEstimate collector area and solar panel quantity
Pool Evaporation & Auto-Fill Cost CalculatorEstimate gallons lost to evaporation and the resulting refill cost.
Pool Refill Water Cost CalculatorCalculate the cost of replacing a known amount of pool water.
Electrical Cost (Pump/SWG/Heater)kWh cost per day/week/month
Gas Heater Cost EstimatorEstimate fuel usage and cost
Heat Loss / Cover Savings EstimatorCompare uncovered vs covered heat loss
Heat Pump Run Time EstimatorRough runtime by conditions
Pool Heater Bypass Flow GuideUnderstand heater flow requirements, bypass valves, and common setup problems.
Heater Bypass Troubleshooting HelperSelect your symptoms and get practical bypass and valve-setting checks.
Heater Size Estimator (BTU)Estimate BTU needed for desired temp rise

Water Replacement

Should I Drain My Pool?Estimate partial replacement and review structural risks
Dilution Mixing CalculatorMixing math for any parameter
High CYA Quick Decision ToolEnter your CYA level and get a practical next-step recommendation.
High CYA Options PlannerCompare draining, managing higher chlorine targets, and changing chlorine products.
Partial Drain / Refill (CH Reduction)Drain % to reduce CH
Partial Drain / Refill (CYA Reduction)How much to drain to reach target CYA
Partial Drain / Refill (Salt Reduction)Drain % to reduce salt ppm

Construction & Renovation

Pool Plumbing Pipe Length CalculatorEstimate total pipe length with fittings and waste
Pool Trench Volume CalculatorEstimate trench excavation and backfill volume
Concrete Pool Deck CalculatorEstimate deck area and concrete volume
Concrete Yardage CalculatorEstimate concrete for slabs and pads
Pool Equipment Pad Size PlannerPlan equipment footprints and service clearance
Pool Safety Cover Anchor Layout PlannerEstimate perimeter anchor count for planning
Pool Return Jet Layout PlannerEstimate return count, spacing, and flow
Pool Main Drain Flow CalculatorCompare flow with listed suction-outlet capacity
Pool Excavation Volume CalculatorEstimate excavation volume with overdig
Pool Rebar EstimatorEstimate grid bar count and linear feet
Pool Gravel & Sand Base CalculatorEstimate base volume and material weight
Vermiculite Pool Floor CalculatorEstimate floor-base volume and bag quantity
Pool Water & Winter Cover Weight CalculatorCalculate pool-water or cover-water weight
Pool Fill Time, Water Truck & Refill CalculatorEstimate fill time and water-truck loads
Pool Tile CalculatorEstimate waterline tile quantity with waste
Pool Coping EstimatorEstimate coping pieces from perimeter and waste
Vinyl Pool Liner Measurement HelperOrganize key liner measurements for field verification
Pool Fence Requirement & Safety HelperReview barrier dimensions and gate safety features
Should I Replace My Pool Liner?Evaluate age, leaks, damage, repair cost, and replacement timing
Remodel or Resurface My Pool?Match surface condition and desired upgrades to project scope

Metals & Stains

Ascorbic Acid Treatment PlannerPlan and precautions for AA stain lift
Copper Algaecide Warning HelperCopper risks and stain potential
Copper Stain TroubleshooterGreen hair/steps? Quick diagnosis
Iron Stain TroubleshooterSymptoms → likely cause → next steps
Metal Sequestrant DoseDose estimate by product strength
Metal Test Interpretation HelperHow to read iron/copper tests

Startup & Closing

Antifreeze Amount EstimatorEstimate line antifreeze volume (rough)
Cover Water Volume & Pump Runtime CalculatorEstimate water sitting on the cover and how long your pump will need to remove it.
Cover Pump Runtime CalculatorCalculate pump runtime from gallons to remove and the pump flow rating.
Spring Opening Chemical PlannerOpening checklist + dosing guide
Winter Closing Chemical PlannerClosing checklist + targets

Troubleshooting

Evaporation Rate EstimatorEstimate evaporation in your conditions
Leak Bucket Test TrackerTrack evaporation vs leak loss

Quick Tools

Dose Splitter (Multiple Adds)Split a dose into multiple additions
Gallons ↔ Liters ConverterConvert gallons and liters
Ounces ↔ Pounds ↔ Grams ConverterCommon pool dosing units
Percent Strength CalculatorAdjust doses for different strengths

Water Loss

Pool Leak Cost CalculatorEstimate water and chemical cost from a pool leak
Pool Evaporation Comparison by RegionCompare evaporation across regional climate profiles
Pool Splash-Out CalculatorEstimate water lost from swimmers and active play
Pool Autofill Water Usage CalculatorEstimate autofill use from flow and runtime
Pool Autofill Failure HelperCheck common no-fill and overfill causes
Pool Rain & Overflow Loss CalculatorEstimate rainfall gain and overflow loss
Pool Wind Evaporation Impact EstimatorAdjust baseline evaporation for wind exposure

Seasonal Pool Care

Spring Pool Startup Timeline PlannerPlan startup from water condition and equipment readiness
Pool Freeze Protection Runtime HelperPlan cold-weather circulation from forecast conditions
Pool Storm, Hurricane & Monsoon Recovery PlannerPrioritize cleanup after severe weather
Pool Cover Snow Load CalculatorEstimate snow weight and cover load
Pool Ice Expansion Risk HelperReview freeze expansion risks and protection
Pool Leaf Volume CalculatorEstimate leaf volume and cleanup bags
Pool Pollen Cleanup PlannerEstimate cleanup intensity from pollen load

Pool Safety

Pool Chemical Storage & Shelf-Life HelperReview storage, container condition, and shelf-life information
Pool Deck Slip Hazard ReminderFlag common deck slip-and-fall conditions
VGB Drain Cover Compliance HelperOrganize drain-cover documentation and safety checks
Pool Fence Height & Opening HelperCompare barrier dimensions with general guidance
Pool Gate Swing & Latch Safety ReminderCheck gate direction, closing, latching, and access
Pool Diving Depth Safety HelperFlag diving plans requiring professional verification

Pool Party

Pool Party Budget CalculatorEstimate food, drink, supply, and contingency costs
Pool Party Drinks, Ice & Cooler CalculatorEstimate drinks, ice, and cooler capacity
Pool Party Food CalculatorEstimate servings and food budget
Pool Party Seating, Umbrella & Shade PlannerEstimate extra seating and shade units

Backyard & Patio

Poolside Paver CalculatorEstimate paver quantity with waste
Pool Patio Area & Base CalculatorEstimate patio area and base material
Poolside Fire Pit Block CalculatorEstimate circular fire-pit wall blocks

Commercial Pools

Commercial Pool Bather Load PlannerEstimate planning load from entered local limits
Commercial Pool Chemical Consumption CalculatorProject chemical consumption from daily use
Commercial Pool ORP Adjustment HelperReview ORP with pH, disinfectant, and controller context
Commercial Pool Health Department Log PlannerEstimate log entries and recordkeeping needs
Hotel Pool Capacity PlannerEstimate capacity from entered local limits
HOA Pool Capacity PlannerEstimate HOA pool capacity from facility limits
Lifeguard Chair Coverage PlannerEstimate observation stations from entered coverage
Commercial Pool Daily Log Sheet PlannerCalculate daily test and inspection log rows
Commercial Pool Backwash Schedule HelperCompare pressure with the approved backwash trigger
Commercial Pool Chemical Budget CalculatorEstimate seasonal chemical cost and contingency

173 listed • auto-Live when tool file exists ✅

Safety & Accuracy Disclaimer (read)

Pool Toolkit provides estimates for educational purposes. Pool water chemistry and dosing can vary by product strength, water conditions, circulation, testing method, and measurement error.

Always follow chemical labels, local codes, and manufacturer instructions.
Wear proper PPE and never mix chemicals (especially chlorine products and acids).
When in doubt, dose smaller, circulate, retest, and adjust.
If you have safety concerns, equipment issues, or severe water problems, consult a qualified pool professional.

“SLAM” is a process term used by some pool care communities; Pool Toolkit is not affiliated with any specific forum or manufacturer.

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