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Skip to contentPercentage, loan, BMI, tip, age and unit converters — instant browser calculators.
Spreadsheets are overkill for one-off math. Tentaco Calculator Studio runs deterministic formulas locally — copy results into emails, slides or homework without formula errors.
All calculators work without sign-up and respect your input privacy. Browse related Tentaco tools on this hub, open a studio mode when you need a fuller workspace, and keep files on your device whenever the tool runs locally.
Percentage Calculator — percent change online
Work out percentages, increases, decreases and ratios. Tentaco Percentage Calculator: review input and get an instant result — free, no sign-up.
Tip Calculator online — free
Calculate tips and split the bill between people. Tentaco Tip Calculator: review input and get an instant result — free, no sign-up.
Loan Calculator — monthly payment estimate
Estimate monthly payments, total interest and amortization. Tentaco Loan Calculator: review input and get an instant result — free, no sign-up.
Unit converter — length, weight, temperature
Convert metric and imperial units instantly in your browser. Free unit converter — no signup.
Age Calculator — exact age from birthdate
Calculate exact age in years, months and days from a birth date. Tentaco Age Calculator: review input and get an instant result — free, no sign-up.
Productivity & everyday calculators
Pomodoro timer, sleep cycles, tip and loan calculators, date math — focus and finance helpers.
Free text tools online
Transform, count, compare and clean text in your browser — case, lines, diffs and more without upload.
Unit converters — length, weight, temperature and more
Convert metric, imperial and scientific units instantly in browser.
Productivity timers — Pomodoro and focus sessions
Free Pomodoro timer, stopwatch and focus utilities — no account or cloud sync.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
No — calculations run in your session only.
Calculators are educational — consult professionals for decisions.
Yes — responsive layouts work on phones.