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Convert dog years to human years using a more realistic age curve.

Estimate adult weight and growth progress for a puppy.

Estimate carbohydrate content in wet or dry cat food from Guaranteed Analysis label values.

Estimate how much yarn you need for a blanket by size, yarn weight, stitch type, and skein length. Get yards, meters, skeins, and extra buffer.

Calculate how many stitches to cast on for a knit or crochet hat using head circumference, stitch gauge, negative ease, and stitch pattern repeat.

Calculate how much grass seed you need for a new lawn, overseeding, patch repair, or lawn renovation.

Estimate daily calories for a cat from weight, life stage, neuter status, and activity level.

Calculate water, salt, yeast, and total dough weight from flour weight and baker's percentages so you can scale any bread recipe fast.

Estimate how many seed beads to string before crocheting a bead rope, bracelet, or necklace. Enter rope length, bead size, beads per round, and pattern repeat.

Calculate exact NaOH or KOH amounts for cold process soap recipes based on your oils, superfat, and water discount.

Solve absolute value equations of the form |ax + b| = c. Finds all real solutions with step-by-step working, handles one solution, two solutions, and no-solution cases.

Convert cat years to human years and see your cat's estimated life stage.

Calculate the exact grams of sausage salt from the total meat and fat weight using a practical grams-per-kilogram ratio.

Convert one vinegar strength to another by matching the same acetic acid amount for pickling and canning recipe math.

Convert a fraction to a percentage instantly, or turn a percentage into a simplified fraction. Enter the numerator and denominator or type a percentage value.

Calculate how much bark mulch, wood chips, compost mulch, straw, or decorative mulch to buy in cubic meters, liters, cubic feet, cubic yards, or bags.

Find the average of multiple percentages. Supports weighted averages with different sample sizes for accurate results across unequal groups.

Find how many periods it takes a quantity to double at a constant growth rate. Works for investments, populations, bacteria, and any exponentially growing quantity.

Calculate how many seedlings, vegetables, flowers, shrubs, or hedge plants fit in a garden bed from plot size, plant spacing, row spacing, and planting pattern.

Find how far a measurement deviates from the true value as a percentage. Works for any experiment, lab result, or real-world measurement.