Clear Popular calculators
Percentage Calculator
Six modes: of, as %, increase, decrease, change & difference.
Fraction Calculator
Add, subtract, multiply & divide — with steps shown free.
Scientific Calculator
Trig, logs, powers, factorials, memory & history tape.
GPA Calculator
Compute your grade point average from courses.
Final Grade Calculator
The score you need on the final — or your grade if you get X.
Test Grade Calculator
What you need on the final — needed, safe, or out of reach.
Standard Deviation Calculator
Mean, median, mode & SD — paste data or upload a CSV.
Age Calculator
Exact age, days lived & next birthday countdown.
Why Clear Math?
Every tool runs entirely in your browser — your numbers never leave your device.
Every category, one shelf
Guides & articles
Get Out of Debt: Avalanche vs Snowball
Two proven payoff orders, one worked $500-a-month example, and how to pick the one you’ll finish.
Calculate a Mortgage Payment by Hand
The formula, a full worked example, and how to check your lender’s quote in minutes.
Compound Interest, Explained With Real Numbers
How $10,000 and $200 a month actually grow over 10, 20 and 30 years — plus the rule of 72.
Percentages Without a Calculator
The 10% anchor trick, reverse percentages and stacked discounts — mental math that works anywhere.
Why Our Calculators Solve Backwards Too
Most calculators answer one way. Ours solve for whichever number you’re missing — here’s why.
Mathway Alternatives: Free Step-by-Step Math Help
Need the working shown, free? An honest comparison — including where Mathway is stronger.
HELOC: Draw vs Repayment, With Real Numbers
Interest-only payments, then an 82% payment jump — both phases of a $20,000 line, priced.
How to Read an Amortization Schedule
What every column means, where the interest hides, and the month principal finally wins.
Calculator.net Alternatives
Two decades and ~200 tools, honestly credited — and the solve-backwards workflow we built instead.
How Much House Can I Afford?
The 28/36 rule worked end to end — and why your tax bill, not your salary, sets the ceiling.
How to Calculate Overtime Pay
Time-and-a-half and double time in three buckets, with a full worked week at $20 an hour.
CD vs Savings Account
The APY gap on $10,000 over five years, the penalty priced, and the ladder that splits the difference.
💾 My saved calculations
No saved calculations yet — open any calculator and hit “Save this calculation”. They’ll show up here, no account needed.