Math & Calculators

Everyday numbers, worked out for you. Calculate percentages, work out loan repayments and total interest, check a BMI, find an exact age in years, months and days, split a bill with the tip calculator or reach for a full scientific calculator — instant results, no spreadsheets required.

Compound Interest Project investment growth over time. Live

Percentage Increase, decrease and 'what %'. Live

Loan Calculator Monthly payment and total interest. Live

BMI Calculator Body mass index in metric or US. Live

Age Calculator Exact years, months and days. Live

Tip Calculator Split the bill, set the tip. Live

Scientific A full calculator in your browser. Live

Mortgage Calculator Payment, amortization schedule and chart. New

Calorie Calculator BMR, TDEE and daily calorie targets. New

Days Between Dates Count the days between two dates. New

Discount Calculator Sale price and how much you save. New

Sales Tax Calculator Add or extract tax from a price. New

GPA Calculator Weighted GPA from grades and credits. New

Hours Calculator Clock in/out to total hours and pay. New

Fraction Calculator Add, subtract, multiply, divide fractions. New

Average Calculator Mean, median, mode and more. New

Ratio Calculator Solve and simplify ratios. New

Square Footage Area in square feet and meters. New

Due Date Calculator Estimate your pregnancy due date. New

Why use these math & calculators?

Every tool in this collection runs entirely in your browser. That means there's nothing to install and nothing to sign up for, and crucially, the files and text you work with never leave your device — no uploads, no accounts, no tracking. Just open a tool and get the job done.

Browse the full set of ToolNest tools, or jump straight to the one you need above.