10BII Calc HD
by Ernest Brock
- Finance
- Paid
- Rating
- 4.9
- 3.8K ratings · US storefront
- Top 35%among 92 Finance apps
- Last update
- Nov 19, 2025
- Version 3.8
- Size
- 4 MB
- Category
- Finance
- Tracked since
- Oct 9, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
10BII Calc HD is a business calculator featuring over 100 built-in functions for business, finance, mathematics and statistics. Easily calculate loan payments, interest rates, amortization, discounted cash-flow analyses, TVM (loans, savings, and leasing), bonds and depreciation using a simplified algebraic entry system. The keyboard and display have been carefully optimized for the iPhone, iPod Touch and iPad. Two keyboard layouts and multiple specialized worksheets allow you to do much more than a 10BII calculator while maintaining compatibility with the standard.
HD version includes:
- 2 for the price of 1! iPad and iPhone versions included- use on both your iPad and iPhone
- HD graphics included for iPad and iPhone retina displays
- iPad version includes full support for slide over and split views.
- New worksheets including interactive graphs.
Features:
- Time Value of Money- Loans, savings, leases and amortization schedules using both the standard keyboard and a specialized TVM solver window that displays the contents of all the variables for rapid "what if" solutions to your problems. View and mail amortization tables.
- Interest Conversion- Nominal and effective rates.
- Cash Flows- Net present value, internal rate of return, net future value and net uniform series calculations. Up to 80 cash flows are easily edited and reviewed using the dedicated cash flow editor screen. Entries are added, deleted and modified in a scrolling display with a touch interface unique to the iPhone.
- Business Percentages- Percent change, markup, and margin calculations.
- Statistics- Mean, standard deviation, correlation coefficient, and linear regression forecasting, weighted mean. Sample editor and plotter, forecasting using linear, log, exp or power fit.
- Conversions- 47 world currency rates and over 100 commonly used metric, english and other conversion factors used in financial, business, scientific and engineering calculations.
- Scientific- sin, cos, tan, asin, acos, atan plus the hyperbolic trig functions, conversion between rectangular and polar coordinates, conversion between degrees and radians, time functions including h.ms+ and h.ms-, log, ln, 10^x, e^x, y^x, x root of y, fraction part and integer part. Trig functions can be computed in radians, degrees or gradians.
- Worksheets-
Auto Purchase
Black-Scholes
Bond
BreakEven
Cash Flow Analysis
Currency
Date
Depreciation
Interest Conversion
Lease
Loan Amortization
Margin & Markup
Refinance
Statistics
Tip
TVM
Many of the worksheets include interactive graphs.
- Audit tape records all calculations. Tape can be mailed, texted or printed.
Discover how to use any function on the keyboard by touching the ? key then the key you want to learn about. Help screens are available for all worksheets.
Quote from a customer:
"Last week I had a meeting with my accountants and my bankers. We were working on the pro forma balance sheets and cash flows for a new project I'm working on.
They were all asking why I had switched to the iPhone for I used to be a die hard "brandX phone" fan. I said that one could do so much more. They said "yea...sure" (they were all using "brandX phones") until I started using your calculator. We were analyzing different payment and amortization schedules. They were so impressed by how easily we could figure out the amount of interest, principal and remaining loan balance for any certain period or combination of periods that in the end they were saying "I have to get me one of those".
Great product. Thanks."
What’s new
Release notes for the latest version, as written by the developer.
- Restored memory save between uses
- More iOS26 fixes
Rank history
Daily position in the South Africa charts. #1 is at the top.
- Best rank
- #2
- Current rank
- #2
- Days charting
- 7 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
68/100
Not flagged as small & simple
- Developer size10% · 25
Developer: 4 apps on the charts
- Audience size50% · 20
Ratings: 3,765
- App size100% · 10
Size: 4 MB
- Price model100% · 15
Price model: paid
- Demand proof100% · 30
Best rank #1, 46 countries
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 3.8LatestReleased Nov 19, 2025