Comparison

Rainfall Calculator vs Tank Volume Calculators

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Rainfall Calculator

Calculate potential rainwater harvest volume and cost savings. This tool helps determine annual water collection capacity based on rainfall and roof area, recommending optimal tank sizes for efficient water storage. It also allows for cost-saving analysis by comparing harvested water to mains water prices.

Highlights
  • Instant rainwater calculation
  • Cost savings evaluation
  • Minimum tank size recommendation
  • Supports various input units
  • Formula references included
  • Results copyable to other apps
Features
Read full description

The Rainfall Calculator is a physics/math tool designed to help you determine how many liters/gallons of rainwater you can harvest per year, evaluate cost savings, and recommend the minimum tank size for water storage. Features: - Instant calculation. - Results can be copied to other apps. - Includes formula references. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. Rainwater Collection Calculator: - The catchment area is multiplied by the depth of rain that falls on it to give the total volume of water produced. - 1 millimeter of rain over 1 square meter of roof equals 1 liter of water. - Annual rainfall (in millimeters) x Roof surface area (in square meters) = Roof catchment capacity. - You can add the cost of mains or tap water per m³ to evaluate the annual cost savings if this rainwater is collected and used instead of drinking water. - The minimum tank size should store 33% of the "Annual Rainfall On Your Roof Area" as you will use the water while you are collecting it. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater collection systems can be as simple as collecting rain in a rain barrel or as elaborate as harvesting rainwater into large cisterns to supply your entire household demand. You can also collect rainwater for garden use. Plants prefer rainwater because it's naturally soft and free of chlorine and other chemicals. If drought is a problem where you live, collecting rainwater is a good way to handle watering restrictions. If you're on a municipal water system, you can save a considerable amount of money. Thank you for your support! Visit nitrio.com for more apps for your iOS devices.

About

Tank Volume Calculators

Easily calculate the filled and half-filled volumes of various tank types. This app offers a comprehensive volume converter for numerous units and supports 15 different tank shapes for accurate estimations.

Highlights
  • Calculate filled and half-filled tank volumes
  • Supports 15 different tank types
  • Comprehensive volume converter
  • Converts between multiple units
  • Intuitive user interface
  • Rapid capacity calculations
Features
Read full description

Introducing the Tank Volume Calculator App, the ultimate solution for users seeking accurate calculations for filled and half-filled volumes of water, oil, and gas tanks. This app boasts unparalleled simplicity and speed, making it the go-to choice for calculating tank volumes and gallons effortlessly. One standout feature is its comprehensive volume converter, facilitating conversions between various units such as cubic meters, cubic centimeters, liters, imperial gallons, U.S. gallons, and barrels (BBL), among others. With support for 15 different tank types and gallon measurements, including: Horizontal Cylinder Tank Vertical Cylinder Tank Rectangle Tank Horizontal Oval Tank Vertical Oval Tank Horizontal Capsule Tank Vertical Capsule Tank Horizontal Semi-Capsule Tank Cone Top Tank Cone Bottom Tank Semi-Sphere Tank Cone Frustum Top Tank Cone-Frustum + Cylinder Tank Cone + Frustum Bottom Tank Trapezoid Tank Key Features of the Tank Volume Calculator: Compatibility with all units (millimeters, inches, feet, centimeters, and meters). Intuitive user interface for seamless navigation. Rapid and straightforward tank capacity calculations. Please note that while the Tank Volume Calculator is an invaluable tool for estimation, it should be utilized as such.

Screenshots

Rainfall Calculator4 screens
Tank Volume Calculators4 screens

Verdict

The call

The clearest difference is rating: Rainfall Calculator at 5.0 against Tank Volume Calculators's 1.8. Rainfall Calculator also leads on price ($2.99 vs $3.99). Tank Volume Calculators's advantage is update cadence (every 4 months vs every 29 months) and ratings volume (5 vs 1). On ads, in-app purchases, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Rainfall Calculator costs $2.99 and Tank Volume Calculators $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Rainfall Calculator holds the better App Store score, 5.0 against 1.8. That said, the two scores are not equally well evidenced: Tank Volume Calculators has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Rainfall Calculator ships an update every 29 months, Tank Volume Calculators every 4 months. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

Scorecard4 real differences · 6 level
Rainfall Calculator versus Tank Volume Calculators: the parameters behind the verdict, then further details
ParameterRainfall CalculatorTank Volume Calculators
Price$2.99 — better$3.99
Rating5.0 (1 ratings) — better1.8 (5 ratings)
Positive reviews—0.0% of reviews
Number of ratings15 — better
Update frequencyEvery 29 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1312.0 — better
Further details — not scored
Size1 MB28 MB
Age rating4+4+
DeveloperNitrioKantaben Gorasiya

Customer experience

Rainfall Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Tank Volume Calculators

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Rainfall Calculator

No in-app purchases

None

Tank Volume Calculators

No in-app purchases

Questions

Is Rainfall Calculator free?
Rainfall Calculator costs $2.99, with no in-app purchases.
Is Tank Volume Calculators free?
Tank Volume Calculators costs $3.99, with no in-app purchases.
Which has better reviews, Rainfall Calculator or Tank Volume Calculators?
Rainfall Calculator is rated higher. Rainfall Calculator averages 5.0 out of 5 from 1 ratings, while Tank Volume Calculators averages 1.8 from 5 ratings.
Do Rainfall Calculator or Tank Volume Calculators have ads?
Neither Rainfall Calculator nor Tank Volume Calculators shows ads.
Which is updated more often, Rainfall Calculator or Tank Volume Calculators?
Rainfall Calculator ships an update every 29 months, and Tank Volume Calculators every 4 months. Most recently, Rainfall Calculator was updated on November 2, 2026 and Tank Volume Calculators on November 4, 2026.

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