Comparison

Slope Calculator vs Pipe Math Pro

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

Head to head
About

Slope Calculator

Calculate slope in angle, percentage, or ratio by inputting two sides of a right triangle. This intuitive and easy-to-use application provides the remaining necessary values.

Highlights
  • Calculate slope as angle
  • Calculate slope as percentage
  • Calculate slope as ratio
  • Input two sides of a right triangle
  • Calculate remaining triangle values
  • Intuitive and easy to use
Features
Read full description

Use this App to calculate slope (Angle, Percentage, Ratio). You just need to enter 2 of the 3 sides of a right triangle, we will calculate for you the remaining necessary numbers. This is a very intuitive App, simple and easy to use. Results are estimates for informational purposes only. We are very happy to serve you. If you have any requests, don't hesitate to contact us. - https://www.facebook.com/phan.nhatdang.3/ - phannhatd@gmail.com

About

Pipe Math Pro

Features
Read full description

Know your travel. Know your cut. Get back to the job. Pipe Math Pro puts practical plumbing calculations and clear pipe diagrams in your pocket. Enter your measurements, see where they belong on the picture, and read the result in familiar tape-measure fractions. Designed by a plumber for plumbers, with the measurements you need close to the diagram and explanations available when you need them. ONE PURCHASE. ALL THE TOOLS. No ads. No subscriptions. No yearly fees. No in-app purchases. The calculations work offline, with no account required. OFFSETS: 22½°, 45° AND 60° • Calculate travel from spread. • Enter the fitting allowance and choose one or two deductions. • See spread, travel, fitting allowances and finished cut length on the pipe. • Read travel and cut pipe as separate results. ROLLING OFFSETS • Enter horizontal and vertical offsets. • Calculate true offset, travel and cut length. • Follow a 3-D pipe diagram showing each measurement. • Choose 22½°, 45° or 60° fittings. SPREAD ALLOWANCE • Keep parallel offset runs equally spaced. • Enter the first pipe cut, spacing and number of pipes. • Calculate the next pipe lengths with fitting allowances. • Work with 22½°, 45° and 60° offsets. PIPE SLOPE • Calculate rise over the pipe run. • Choose 1/16, 1/8, 1/4, 1/2 or 5/8 inch per foot, or use the percentage wheel. • See the high-end rise above level ground. PLUMBING QUICK MATH • Pipe volume per foot, total volume and water weight. • Tank capacity and partial fill for rectangular, vertical cylinder and horizontal cylinder tanks. • Water weight, including an empty pipe or tank's weight. • Water head and pressure: feet, PSI and kPa. • Pipe pressure loss with optional elevation and fittings inputs. • Flow and velocity, in either direction. • Fill or drain time, or the flow needed for a chosen time. • Measurement diagrams, input guidance and formulas. CONVERSIONS THAT FIT THE WAY YOU WORK • Feet and inches to metres, centimetres, or metres plus centimetres. • Reverse the direction in a tap. • Litres, Imperial gallons and US liquid gallons, clearly labelled. • Decimal inches to tape-measure fractions. • A basic calculator for everyday arithmetic. Enter decimal inches, fractions or mixed fractions in supported measurement fields. Displayed tape measurements round to the nearest 1/16 inch; calculations retain their underlying precision. Pipe Math Pro is the new version of Pipe Math. If you already own Pipe Math, this update is included with your existing App Store purchase. Use the actual inside dimensions and fitting allowances for your materials. Water pressure-loss results use the Hazen–Williams model and the selected pipe coefficient.

Screenshots

Slope Calculator3 screens
Pipe Math Pro4 screens

Verdict

The call

The clearest difference is price: Slope Calculator at Free against Pipe Math Pro's $9.99. Slope Calculator also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.6). Pipe Math Pro's advantage is in-app purchases (none vs 1). On update cadence and ads 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

Slope Calculator is free to download; Pipe Math Pro costs $9.99 up front. Slope Calculator sells 1 one-off in-app purchase. Pipe Math Pro asks for nothing beyond the download.

UpkeepUpdate frequency

Slope Calculator ships an update every 14 months, Pipe Math Pro every 10 months. The most recent releases landed on October 19, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 6 level
Slope Calculator versus Pipe Math Pro: the parameters behind the verdict, then further details
ParameterSlope CalculatorPipe Math Pro
PriceFree — better$9.99
Rating4.3 (104 ratings) — better—
Positive reviews58.3% of reviews—
Number of ratings104 — better—
Update frequencyEvery 14 monthsEvery 10 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better17.6
Further details — not scored
Size5 MB4 MB
Age rating4+4+
DeveloperPhan Nhat ĐangAntonio Vitella

In-app purchases

1 purchases

Slope Calculator

One-time1
  • Remove ads$1.99
None

Pipe Math Pro

No in-app purchases

Questions

Is Slope Calculator free?
Slope Calculator is free to download, with in-app purchases available.
Is Pipe Math Pro free?
Pipe Math Pro costs $9.99, with no in-app purchases.
Do Slope Calculator or Pipe Math Pro have ads?
Neither Slope Calculator nor Pipe Math Pro shows ads.
Which is updated more often, Slope Calculator or Pipe Math Pro?
Slope Calculator ships an update every 14 months, and Pipe Math Pro every 10 months. Most recently, Slope Calculator was updated on October 19, 2026 and Pipe Math Pro on October 5, 2026.

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