Everyday calculators

Calculate percentages, discounts, dilution, loan payments, tank volume, unit prices, salary estimates and compound growth.

Percentage Calculator

Calculate percent of a number, percentage change, discount percentage, part-of-total questions, and percentage-point differences in your browser.

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Discount Calculator

Calculate percent off, final price, coupons, stacked discounts, and shipping, or find the discount from a regular price and sale price.

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Unit Price Calculator

Compare package prices by weight, volume, or item count using metric or US customary units.

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Salary to Hourly Calculator

Convert monthly salary to hourly wage, or hourly wage to estimated monthly salary, using work days, daily hours, and average weeks per month.

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Compound Interest Calculator

Compare reinvested compound growth with non-reinvested earnings using principal, contributions, annual return, years, and a yearly chart.

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Dilution Calculator for Mixing Ratios

Calculate concentrate and water for final-solution ratios or product-to-water ratios using metric or US customary volume units.

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Loan Payment Calculator with Amortization

Estimate fixed-rate principal-and-interest payments, total interest, and an amortization schedule with an editable currency symbol.

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Tank and Container Volume Calculator

Estimate rectangular, cylindrical, or tapered tank capacity, fill volume, water weight, and soil-bag equivalents in metric or US customary units.

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Start with the question, then choose the calculator

Everyday calculations often fail because the wrong base value, unit, work schedule, or rate assumption is used. Choose the focused calculator that matches the question and review the assumptions shown with the result.

Use Percentage Calculator for the math relationship and Discount Calculator for checkout order, coupons, and shipping.
Use Price Comparison when packages have different weights, volumes, or item counts.
Treat salary and compound-interest results as planning estimates; taxes, benefits, fees, inflation, and local rules are not automatically included.

Task	Start with	Why
Find a percent, change, or discount rate	Percentage Calculator	Separates four common percentage questions.
Calculate a checkout price	Discount Calculator	Includes percent off, coupons, a second discount, and shipping.
Compare different package sizes	Unit Price Calculator	Normalizes weight, volume, or item count.
Find a measurement converter	Unit Conversion Guide	Find dedicated converters in the Unit converters category.
Mix a labeled dilution ratio	Dilution Calculator	Calculates concentrate and water while distinguishing final-solution ratios from product-to-water ratios.
Estimate a fixed-rate loan payment	Loan Calculator	Shows principal-and-interest payment, total interest, and an amortization schedule.
Estimate tank or container capacity	Tank Volume Calculator	Handles rectangular, cylindrical, and tapered containers in metric or US customary units.