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Free browser-based calculators and unit converters. All calculations happen instantly on your device.
AdvertisementWhat is X% of Y, percentage change & more
Monthly payment, total interest & amortisation
Exact age in years, months and days
Body Mass Index with health category
mm, cm, m, km, inch, foot, yard, mile
mg, g, kg, tonne, oz, lb, stone
Celsius, Fahrenheit and Kelvin
sqm, sqft, sqkm, acre, hectare
km/h, mph, m/s, knots, ft/s
ml, litre, gallon, cup, pint, fl oz
Bytes, KB, MB, GB, TB, PB
Calories burned by activity and weight
Full calculator with trig, log, sqrt
Toolzilla's Calculator & Converter Tools cover everyday maths, finance, health, and unit conversions. Calculate loan payments, BMI, age differences, percentages, and convert between length, weight, temperature, area, speed, volume, and data units — instantly and privately in your browser.
Find percentages, percentage change, and what-percent-is-what values.
Tip: Use percentage change to track month-over-month revenue growth.
Estimate monthly payments, total interest, and amortisation for loans.
Tip: Shorter loan terms mean higher monthly payments but less total interest.
Calculate exact age in years, months, and days between two dates.
Tip: Useful for eligibility checks, event planning, and milestone tracking.
Calculate Body Mass Index from height and weight.
Tip: BMI does not account for muscle mass — consult a health professional for full assessment.
Convert length, weight, temperature, area, speed, volume, and digital data units.
Tip: Data unit converter helps when estimating cloud storage or file transfer sizes.
Perform advanced maths including trigonometry, logarithms, and powers.
Tip: Double-check financial figures with the percentage and loan calculators for business use.
Results use standard mathematical formulas and are accurate for everyday use. Financial decisions should also involve professional advice.
Once the page is loaded, most calculators work without an internet connection since all maths runs locally.
Yes for quick estimates. For official accounting, tax filings, or lending decisions, use qualified professional tools and advisers.
Metric and imperial units are supported across length, weight, temperature, area, speed, and volume converters.
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