The arithmetic you could do by hand but shouldn't have to: what a loan actually costs over its full term, what's left after a stacked discount, how many days until a deadline, how many hours a timesheet adds up to in payroll decimals, what a price is with sales tax added or backed out.
Each one shows its working rather than just an answer, because the number is usually the start of a decision rather than the end of one. Everything computes instantly in your browser — nothing is logged, and there's no sign-up wall in front of a result.
All calculators tools
- Unit Converter — Length, weight, temperature, data, volume and speed.
- Percentage Calculator — Percentage of, increase, decrease and change — no mental math.
- Age Calculator — Exact age in years, months and days — plus your next birthday.
- Tip Calculator — Tip, total and per-person split in one glance.
- Date Calculator — Days between dates, or add and subtract time from any date.
- Discount Calculator — Final price, savings and stacked discounts in one glance.
- Loan Calculator — Monthly payment, total interest and cost for any loan.
- Fraction Calculator — Add, subtract, multiply and divide fractions — simplified automatically.
- GPA Calculator — Your GPA on the 4.0 scale from grades and credit hours.
- Sales Tax Calculator — Add tax to a price, or back the tax out of a total.
- Hours Calculator — Weekly timesheet hours with breaks — in payroll-ready decimals.
- Average Calculator — Mean, median, mode and standard deviation from any list of numbers.
Popular conversions
- CM to Inches
- Inches to CM
- MM to Inches
- Inches to MM
- Inches to Feet
- Feet to Inches
- CM to Feet
- Feet to CM
- Metres to Feet
- Feet to Metres
- KM to Miles
- Miles to KM
- KG to LBS
- LBS to KG
- Grams to Ounces
- Ounces to Grams
- KG to Stone
- Stone to LBS
- Fahrenheit to Celsius
- Celsius to Fahrenheit
- ML to Fluid Ounces
- Litres to Gallons
- Cups to ML
- MB to GB
- GB to MB
- KM/H to MPH
- MPH to KM/H
Frequently asked questions
Are the results saved or sent anywhere?
No. Every calculator here runs as JavaScript in your own browser. Nothing you type is transmitted or stored, which is worth knowing before you put a salary or loan balance into a calculator on a site you don't control.
Can I rely on the loan calculator for a real mortgage?
Use it to compare options and understand the shape of the repayment, not as a quote. It computes standard amortisation correctly, but a real offer includes arrangement fees, insurance requirements and rate changes that no generic calculator knows about.
Which calculator handles unit conversion?
The unit converter covers length, weight, temperature, data, volume and speed, and there are direct pages for the common pairs — centimetres to inches, kilograms to pounds, Fahrenheit to Celsius and so on — if you'd rather land straight on the one you need.