This is your next percentage calculator app.
Percentage calculator app for Apple Watch

Calculate. Adjust. Repeat.

Percent Mate is the wearable edition of our percentage calculator app for iPhone and iPad introduced in 2013. Our 10 year anniversary is just around the corner.

Ready, Set, Go!

Up and down Stepper-buttons allow quick modifications of the calculation and instant update of the result. Choose between five predefined incremental units and gain full control by how much you want to fine tune the result.

Rotating is the new typing

Tired of tiny keypads? Choose between a keypad or the digital crown to enter data really fast.

Figure this

Choose between 3 precision presets (.0, .00, .000) and a small chart to visualize your solution. You'll probably never need it, but we even fitted a very compact manual in the app.

Small in size. Great with numbers.

Percent Mate is designed for calculations of (sales) growth rates, climb rates (RoC), response rates (returns, complaints), weight loss/gain, volume discounts, savings goals, ROI, profit vs. costs, tolerances, fees, discounts, rebates, interest, debt, taxes, VAT (Value Added Tax: in both directions) and restaurant tipping with split function.

Not 100% convinced? Check out our calculation examples on this page and see what our calculator app can compute for you.

System requirements (as of 2023)

Compatible to all Apple Watch Series (38mm-49mm) with WatchOS 5.0 or above. No connection to iPhone needed (runs completely self-sufficient).

But wait - there is less

If you just need to calculate rebates (or negative percentages in general), our Apple Watch app Tiny Sale may suit your needs better. Available in the App Store.

Example #1

Cash discount: 149 with 3% off?

Example #2

Net value: Net value from 199 including 20% VAT?

Example #3

Interest: 2% interest on 7.5K?

Example #4

Interest owing: 9,5% on -5K?

Example #5

Restaurant tip: 12% tip on a restaurant bill of 106.30?

Example #6

Split: 12% tip on top of a bill of 106.30, divided by 4 persons?

Example #7

Tolerances: -3% of 140?

Example #8

Turnover: 152 products sold vs. 115 the month before? Note: 132.2% = +32.2%

Example #9

Response Rate: 28 complaints in a lot of 2586?

Example #10

Volume discount: Buy now! Pay 4, get 5! (= get 5 for the price of 4)

Example #11

Saving: Reaching 5K if 200 are put aside each month? Note: Solution/100 = Months (25)

Example #12

Yield: Earnings of 50K with costs of 41.5K? Note: 120.5% = +20.5%

Example #13

ROI (Return On Investment): 8K profit vs. 41.5K equity?

Example #14

Weight loss: 4.7kg lost of 67.0kg?

Example #15

Proportion: 15 minutes are how much percent of an hour?

Example #16

Converting: How much kilometers are 55 miles?

Example #17

Blank votes share: 145,222 invalid votes of 3,876,942 eligible voters?

Example #18

Average: 24K grew by 47.2% over 10 years. This equals annually?

Example #19

Hourly rate: 3600 kWh per day equals per hour?