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Every calculator you need, with AI.
Every calculator you need, with AI.
Results before you finish typing.
Mortgage, compound interest, BMI, auto loans, 15+ specialized calculators with live results. No equals button. No clutter.
Get StartedTry it for yourself
As you type, on.equals updates the result live
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Monthly Mortgage Payment$4,755.60
Monthly Principal + Interest Amount$3,731.60
Monthly Property Tax$810.00
Monthly Homeowner's Insurance$214.00
Monthly PMI$0.00
Monthly HOA Fees$0.00
AI-Powered
Meet Omar, the AI assistant built into every calculator
Ask Omar what your numbers mean in plain English. Get summaries, catch unusual inputs, and understand your results without leaving the calculator.
Plain-Language Summaries
After every calculation, Omar generates a breakdown of what your result means and what to watch out for. No financial jargon, no manual interpretation.
Anomaly Detection
Unusual inputs, for example, a 0% interest rate, a 1-year mortgage, may trigger a quiet Omar advisory before you act on bad data.
Ask Anything
Type a question directly into Omar's chat panel at the top of any calculator. Ask about your inputs, your results, or what a different scenario would look like.
Mortgage CalculatorLIVE
Home Price$650,000
Down Payment$80,000
Interest Rate7.2%
Loan Term30 yrs
Monthly Payment$3,940
Omar
Ask Omar anything about your results...→
"I asked Omar whether the compound interest scenario I was modeling was realistic for a 10-year horizon. It flagged that my contribution frequency didn't match my stated goal and suggested an adjustment. That would have taken me 20 minutes to figure out on my own."
Free
3 Omar requests per day, context limited to the current calculator.
Pro
10 requests per day with 24/7 monitoring across your entire workspace.
FeaturesEnhance your workflow with cleaner computations
01Live Results as You TypeEvery input you change updates the result instantly, No button press, no page reload. See how a rate change affects your mortgage payment before you finish typing the number.
02Your Most-Used Tools, Front and CenterThe calculators you reach for every day in your personal dashboard. Instead of searching from scratch each visit, open the app and start calculating immediately.
0315+ Calculators, One PlaceMortgage, compound interest, auto loans, and more. Every specialized calculator you would otherwise hunt down across five different websites, built to the same standard and available from one dashboard.
04True One-Handed OperationBuilt for handheld efficiency. Every button, slider, and input is strategically placed within the natural reach of your thumb. Navigate complex calculations comfortably without needing both hands.
05Labeled Values That LastStop forgetting what "$2340.18" meant. Label it "Monthly Payment" and it stays in your sidebar, ready to drag into your next calculation. No more retyping numbers you already figured out.
06Saved Calculation FlowKeep track of your mortgage, auto loan, or savings. Save them locally or in the cloud (Pro) so that next time, you open it, update your numbers, and the results recalculate instantly. No setup, no starting from scratch.
By the numbers.
Precision tools for every workflow.15+Specialized Calculators
0msResult Latency
100%On-Device Processing
∞Labeled Variables
Mortgage Calculator
See how rate, term, and down payment interact with your monthly payment — before you ever sit down with a lender.
Compound Interest
Adjust rate, term, and contribution frequency and watch the growth curve update live. Understand time-in-market like never before.
Auto Loan Calculator
Enter vehicle price, down payment, and term to see your monthly payment instantly. Compare financing options without a dealer in the room.
BMI Calculator
Calculate body mass index and basal metabolic rate on the spot. Built for fitness coaches, nurses, and anyone tracking health metrics professionally.
GPA Calculator
Name each course, enter your grade, and see your cumulative GPA update as you type. Know exactly which classes to prioritize next semester.
TestimonialsLearn more from your peers
Ricky A. ★★★★★Contractor"One-handed calculations on a job site are finally easy. I'm able to get tasks done at a fast pace."
Elijah W. ★★★★★Auto Salesperson"I walk customers through auto loan numbers every day. Changing the term or down payment and watching the monthly payment adjust in real time is something I now do right on the showroom floor."
Sally T. ★★★★★Tax Accountant"Real-time updates without an equals button save so much time on helping my clients with their taxes."
Henny L. ★★★★★Investment Banker"The haptic feedback makes this feel like professional hardware, making it a popular tool in my department."
Tanya B. ★★★★★Fitness Coach"My clients ask me calorie and body fat questions on the spot. I used to stall while a page loaded. Now I have those calculators pinned and the answer is ready before they finish asking."
Amy W. ★★★★★Marketing Manager"Instant social media metrics have completely transformed my reporting. Helps me out with lead generation."
Marcus T. ★★★★★Real Estate Agent"I run mortgage and amortization numbers with clients in the room. The live updates mean I can adjust the down payment while we're talking and they see the monthly payment change instantly. It's a better experience for everyone."
Priya K. ★★★★★Freelance Designer"I used to keep a notes app open just to remember what each number was. Labeling my rates and hours directly in the calculator and dragging them into the next one saves me from a lot of embarrassing invoicing mistakes."
Brandon K. ★★★★★Restaurant Owner"Currency and tip calculations are now a two-second task. My employees are satisfied with their on time returns."
Daniel R. ★★★★★General Contractor"calculator.net was my go-to for years. on.equals has the same calculators but I don't have to hit a button every time I change a measurement. On a job site, that actually matters."
Hadeen O. ★★★★★Shopify Store Owner"on.equals finally understands my specific business workflow. I'm able to track all of my finances and expenses for every single on of my stores."
Sofia M. ★★★★★Personal Finance Blogger"I do a lot of compound interest and savings scenarios for my readers. Being able to scrub through interest rate values and watch the result update in real time makes it so much easier to find numbers worth writing about."
James O. ★★★★★Nurse Practitioner"I use the BMI and BMR calculators constantly. They're clean, fast, and I can pull them up one-handed between patients. Doesn't sound like much until you've fumbled with a desktop site on your phone for the hundredth time."
Max Z. ★★★★★CPA"Replaced my clunky spreadsheets with this streamlined app because it completely simplifies the calculation process."
Rachel H. ★★★★★Small Business Owner"Having my sales tax, profit margin, and tip calculators all pinned to one dashboard instead of bookmarking five different websites is exactly the kind of thing I didn't know I needed."
Kevin L. ★★★★★College Student"I used this for GPA calculations all semester. The labeled values feature meant I could name each class grade, adjust one, and immediately see how it changed my overall GPA without starting over."
Jack N. ★★★★★Graduate Student"Labeling my numbers removes all the guesswork from math. Helps me out with homework and finalizing papers for my research."
Claire N. ★★★★★Project Manager"I replaced three bookmarked calculator sites with this one. Everything I need is in one place and it actually works on my phone without me having to zoom in on a form designed for a desktop from 2012."
Ricky A. ★★★★★Contractor"One-handed calculations on a job site are finally easy. I'm able to get tasks done at a fast pace."
Elijah W. ★★★★★Auto Salesperson"I walk customers through auto loan numbers every day. Changing the term or down payment and watching the monthly payment adjust in real time is something I now do right on the showroom floor."
Sally T. ★★★★★Tax Accountant"Real-time updates without an equals button save so much time on helping my clients with their taxes."
Henny L. ★★★★★Investment Banker"The haptic feedback makes this feel like professional hardware, making it a popular tool in my department."
Tanya B. ★★★★★Fitness Coach"My clients ask me calorie and body fat questions on the spot. I used to stall while a page loaded. Now I have those calculators pinned and the answer is ready before they finish asking."
Amy W. ★★★★★Marketing Manager"Instant social media metrics have completely transformed my reporting. Helps me out with lead generation."
Marcus T. ★★★★★Real Estate Agent"I run mortgage and amortization numbers with clients in the room. The live updates mean I can adjust the down payment while we're talking and they see the monthly payment change instantly. It's a better experience for everyone."
Priya K. ★★★★★Freelance Designer"I used to keep a notes app open just to remember what each number was. Labeling my rates and hours directly in the calculator and dragging them into the next one saves me from a lot of embarrassing invoicing mistakes."
Brandon K. ★★★★★Restaurant Owner"Currency and tip calculations are now a two-second task. My employees are satisfied with their on time returns."
Daniel R. ★★★★★General Contractor"calculator.net was my go-to for years. on.equals has the same calculators but I don't have to hit a button every time I change a measurement. On a job site, that actually matters."
Hadeen O. ★★★★★Shopify Store Owner"on.equals finally understands my specific business workflow. I'm able to track all of my finances and expenses for every single on of my stores."
Sofia M. ★★★★★Personal Finance Blogger"I do a lot of compound interest and savings scenarios for my readers. Being able to scrub through interest rate values and watch the result update in real time makes it so much easier to find numbers worth writing about."
James O. ★★★★★Nurse Practitioner"I use the BMI and BMR calculators constantly. They're clean, fast, and I can pull them up one-handed between patients. Doesn't sound like much until you've fumbled with a desktop site on your phone for the hundredth time."
Max Z. ★★★★★CPA"Replaced my clunky spreadsheets with this streamlined app because it completely simplifies the calculation process."
Rachel H. ★★★★★Small Business Owner"Having my sales tax, profit margin, and tip calculators all pinned to one dashboard instead of bookmarking five different websites is exactly the kind of thing I didn't know I needed."
Kevin L. ★★★★★College Student"I used this for GPA calculations all semester. The labeled values feature meant I could name each class grade, adjust one, and immediately see how it changed my overall GPA without starting over."
Jack N. ★★★★★Graduate Student"Labeling my numbers removes all the guesswork from math. Helps me out with homework and finalizing papers for my research."
Claire N. ★★★★★Project Manager"I replaced three bookmarked calculator sites with this one. Everything I need is in one place and it actually works on my phone without me having to zoom in on a form designed for a desktop from 2012."
Ricky A. ★★★★★Contractor"One-handed calculations on a job site are finally easy. I'm able to get tasks done at a fast pace."
Elijah W. ★★★★★Auto Salesperson"I walk customers through auto loan numbers every day. Changing the term or down payment and watching the monthly payment adjust in real time is something I now do right on the showroom floor."
Sally T. ★★★★★Tax Accountant"Real-time updates without an equals button save so much time on helping my clients with their taxes."
Henny L. ★★★★★Investment Banker"The haptic feedback makes this feel like professional hardware, making it a popular tool in my department."
Tanya B. ★★★★★Fitness Coach"My clients ask me calorie and body fat questions on the spot. I used to stall while a page loaded. Now I have those calculators pinned and the answer is ready before they finish asking."
Amy W. ★★★★★Marketing Manager"Instant social media metrics have completely transformed my reporting. Helps me out with lead generation."
Marcus T. ★★★★★Real Estate Agent"I run mortgage and amortization numbers with clients in the room. The live updates mean I can adjust the down payment while we're talking and they see the monthly payment change instantly. It's a better experience for everyone."
Priya K. ★★★★★Freelance Designer"I used to keep a notes app open just to remember what each number was. Labeling my rates and hours directly in the calculator and dragging them into the next one saves me from a lot of embarrassing invoicing mistakes."
Brandon K. ★★★★★Restaurant Owner"Currency and tip calculations are now a two-second task. My employees are satisfied with their on time returns."
Daniel R. ★★★★★General Contractor"calculator.net was my go-to for years. on.equals has the same calculators but I don't have to hit a button every time I change a measurement. On a job site, that actually matters."
Hadeen O. ★★★★★Shopify Store Owner"on.equals finally understands my specific business workflow. I'm able to track all of my finances and expenses for every single on of my stores."
Sofia M. ★★★★★Personal Finance Blogger"I do a lot of compound interest and savings scenarios for my readers. Being able to scrub through interest rate values and watch the result update in real time makes it so much easier to find numbers worth writing about."
James O. ★★★★★Nurse Practitioner"I use the BMI and BMR calculators constantly. They're clean, fast, and I can pull them up one-handed between patients. Doesn't sound like much until you've fumbled with a desktop site on your phone for the hundredth time."
Max Z. ★★★★★CPA"Replaced my clunky spreadsheets with this streamlined app because it completely simplifies the calculation process."
Rachel H. ★★★★★Small Business Owner"Having my sales tax, profit margin, and tip calculators all pinned to one dashboard instead of bookmarking five different websites is exactly the kind of thing I didn't know I needed."
Kevin L. ★★★★★College Student"I used this for GPA calculations all semester. The labeled values feature meant I could name each class grade, adjust one, and immediately see how it changed my overall GPA without starting over."
Jack N. ★★★★★Graduate Student"Labeling my numbers removes all the guesswork from math. Helps me out with homework and finalizing papers for my research."
Claire N. ★★★★★Project Manager"I replaced three bookmarked calculator sites with this one. Everything I need is in one place and it actually works on my phone without me having to zoom in on a form designed for a desktop from 2012."
Ricky A. ★★★★★Contractor"One-handed calculations on a job site are finally easy. I'm able to get tasks done at a fast pace."
Elijah W. ★★★★★Auto Salesperson"I walk customers through auto loan numbers every day. Changing the term or down payment and watching the monthly payment adjust in real time is something I now do right on the showroom floor."
Sally T. ★★★★★Tax Accountant"Real-time updates without an equals button save so much time on helping my clients with their taxes."
Henny L. ★★★★★Investment Banker"The haptic feedback makes this feel like professional hardware, making it a popular tool in my department."
Tanya B. ★★★★★Fitness Coach"My clients ask me calorie and body fat questions on the spot. I used to stall while a page loaded. Now I have those calculators pinned and the answer is ready before they finish asking."
Amy W. ★★★★★Marketing Manager"Instant social media metrics have completely transformed my reporting. Helps me out with lead generation."
Marcus T. ★★★★★Real Estate Agent"I run mortgage and amortization numbers with clients in the room. The live updates mean I can adjust the down payment while we're talking and they see the monthly payment change instantly. It's a better experience for everyone."
Priya K. ★★★★★Freelance Designer"I used to keep a notes app open just to remember what each number was. Labeling my rates and hours directly in the calculator and dragging them into the next one saves me from a lot of embarrassing invoicing mistakes."
Brandon K. ★★★★★Restaurant Owner"Currency and tip calculations are now a two-second task. My employees are satisfied with their on time returns."
Daniel R. ★★★★★General Contractor"calculator.net was my go-to for years. on.equals has the same calculators but I don't have to hit a button every time I change a measurement. On a job site, that actually matters."
Hadeen O. ★★★★★Shopify Store Owner"on.equals finally understands my specific business workflow. I'm able to track all of my finances and expenses for every single on of my stores."
Sofia M. ★★★★★Personal Finance Blogger"I do a lot of compound interest and savings scenarios for my readers. Being able to scrub through interest rate values and watch the result update in real time makes it so much easier to find numbers worth writing about."
James O. ★★★★★Nurse Practitioner"I use the BMI and BMR calculators constantly. They're clean, fast, and I can pull them up one-handed between patients. Doesn't sound like much until you've fumbled with a desktop site on your phone for the hundredth time."
Max Z. ★★★★★CPA"Replaced my clunky spreadsheets with this streamlined app because it completely simplifies the calculation process."
Rachel H. ★★★★★Small Business Owner"Having my sales tax, profit margin, and tip calculators all pinned to one dashboard instead of bookmarking five different websites is exactly the kind of thing I didn't know I needed."
Kevin L. ★★★★★College Student"I used this for GPA calculations all semester. The labeled values feature meant I could name each class grade, adjust one, and immediately see how it changed my overall GPA without starting over."
Jack N. ★★★★★Graduate Student"Labeling my numbers removes all the guesswork from math. Helps me out with homework and finalizing papers for my research."
Claire N. ★★★★★Project Manager"I replaced three bookmarked calculator sites with this one. Everything I need is in one place and it actually works on my phone without me having to zoom in on a form designed for a desktop from 2012."
Stop clicking calculate. Try all of our calculators for free today.Experience the precision of a calculator built for your workflow.Get StartedFAQs
Is on.equals truly free?The core suite of calculators and available resources are free. Down the road, we may add more features for heavy-power users, which could require a one-time professional upgrade at a minimal cost.
What makes this better than the default calculator?Speed, context, and ergonomics. We offer real-time results, labeled variables, and a UI optimized for one-handed mobile use that the default app lacks.
Are my inputs and calculations private?Your data stays on your device. The only time we request to store your calculation data is if you decide to backup to our system.
How do I save my calculation history?In order to save calculation history, you will need to create an account that will store all your current/past calculations and results. You will also be able to export your numbers in various file formats for your records.
Why should I sign up?Great question! We know that signing up means taking on a relationship with a new partner. That's why we want to be transparent as much as we can when it comes to what we offer. The perks of creating an account allows you to unlock calculation history, cloud backup across devices, and early access to new calculators as they ship. Your calculations are always free to use without an account, signing up just means your work is never lost and always with you!
Is there a paid version of on.equals?Yes! We do offer a paid version with additional features such as professional exports, cloud backups, and priority support. There are many perks that come with being a paid member, and it helps us tremendously with building this app for the long term. To become a paid member, simply create an account and upgrade your plan at any time.
Does the app work offline?Absolutely. All calculation logic is processed locally on your device, ensuring instant results even without an internet connection or cellular service.
Are the calculations and results accurate?We strive to do our best to bring you the closest, accurate solutions to your problems. However, we must disclose that calculations are for informational and educational purposes only. Results are estimates and not guaranteed for accuracy or as a promise of specific terms. We make no representations or warranties regarding the accuracy, completeness, or reliability of any calculation.
How do I contact support?Please send us an email to support@onequals.com